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MazdaSpeed 3/6 - Fuel, Nitrous & Water Injection MazdaSpeed 3/6 - Fuel, Nitrous & Water Injection Have a CDFP fuel pump question? Do you want to add Nitrous or Water Injection to your Mazdaspeed 3/6 ? Please come on in!


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 Old 04-30-2012, 02:13 PM   #1
 
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Default Fuel Pressure Relief Valve Question

How do you determine if the Fuel Pressure Relief Valve is bad? I'm having fuel pressure drop in the 2500 to 4200 rpm range but then will hit targeted hpfp.

I've searched and it seems the only way to test is to read the ap fuel pressure after car is off. I get 500 psi and it increases slightly. Then another time I have the fuel pressure drop below 60 with car off.

Is there a How to on replacing this part?

Thanks in advance.
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 Old 05-02-2012, 07:21 PM   #2
 
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HOW-TO: Replace Relief Valve (RV)

The test you performed is the reccomended test. I am diagnosing this issue with a buddy's car now. Sometimes fuel pressure shits the bed, sometimes it holds strong. My car with key on engine off drops pressure real low...it does not build...but my fuel pressure with car on is spot on. Weird.
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 Old 05-07-2012, 03:40 PM   #3
 
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Well I got the 2150 upgrade garage fuel relief and no change. Pressure still drops between 3k and 4k rpm. Now what. I can't just keep throwing money at everything. Please help.
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 Old 05-07-2012, 03:42 PM   #4
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Is the fuel pressure failing at peak load?


my guess is internals
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 Old 05-07-2012, 03:44 PM   #5
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If its dropping at peak load, around 2.0 +, then your internals are bad.
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 Old 05-07-2012, 04:35 PM   #6
 
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If not at peak load, then possible it is your in tank filter clogged up?
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 Old 05-07-2012, 04:36 PM   #7
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Or spill valve, post logs op!

This thread is useless without a log
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 Old 05-08-2012, 04:11 AM   #8
 
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I apologize. Here is a log from a day ago.
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 Old 05-08-2012, 04:17 AM   #9
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Originally Posted by twintzs View Post
I apologize. Here is a log from a day ago.
What internals do you have? That looks like the kmd drop fuel psi at max load syndrome lol.
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 Old 05-08-2012, 04:26 AM   #10
 
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Yes I have the KMD internals. This log was taken in 4th gear at 2500 RPM to 6500 rpm.
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 Old 05-08-2012, 04:27 AM   #11
 
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Your "Actual" is great. (HPFP Act. Press. (PSI) vs HPFP Des. Press. (PSI))...but the desired is dropping off? You can leave it so your commanding 1749 across the RPM range.... the Fuel Pressure Relief Valve is still giving you over 2000 psi NP. And peak load is happening 3000 rpm prior to the strange drop off? I'm curious as to whats going on...subbed.
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 Old 05-08-2012, 04:27 AM   #12
 
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I have a dyno session set for tomorrow morning should I cancel it based on the log?
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 Old 05-08-2012, 04:28 AM   #13
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Originally Posted by leon78 View Post
Your "Actual" is great. (HPFP Act. Press. (PSI) vs HPFP Des. Press. (PSI))...but the desired is dropping off? You can leave it so your commanding 1749 across the RPM range.... the Fuel Pressure Relief Valve is still giving you over 2000 psi NP. And peak load is happening 3000 rpm prior to the strange drop off? I'm curious as to whats going on...subbed.
His desired is staying at 1749, its his actual that is dropping around 2.15 load.
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 Old 05-08-2012, 04:35 AM   #14
 
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Originally Posted by G26 View Post
His desired is staying at 1749, its his actual that is dropping around 2.15 load.
Ahh, thanks....I looked over that dip where it goes down to 1350ish cuz it jumps right back up just fine. Why does the Calculated Load effect the mechanics of the HPFP (KMD wise) ?, electric signal says time for fuel cut?
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 Old 05-08-2012, 04:40 AM   #15
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Originally Posted by leon78 View Post
Ahh, thanks....I looked over that dip where it goes down to 1350ish cuz it jumps right back up just fine. Why does the Calculated Load effect the mechanics of the HPFP (KMD wise) ?, electric signal says time for fuel cut?
Because load is effectively torque. At max torque fueling demands are the greatest.
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 Old 05-08-2012, 05:09 AM   #16
 
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I removed the internals last week and inspected them. I wasnt sure what I was looking for but I did take some pictures.
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File Type: jpg DSC00497.JPG (5.01 MB, 88 views)
File Type: jpg DSC00498.JPG (4.52 MB, 88 views)
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File Type: jpg DSC00501.JPG (4.63 MB, 63 views)
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 Old 05-08-2012, 05:32 AM   #17
 
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I'm concerned about the dyno session should I not go? I dont know how bad this is.
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 Old 05-08-2012, 05:51 AM   #18
 
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Pretty sure this isn't bad internals, it looks more like some sort of fuel cut to me. Are you running the HPRV in this log? Who is tuning you? @phate may have a little more insight on this.
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 Old 05-08-2012, 06:14 AM   #19
 
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here is the log with the upgraded hpfp relief valve. Boost_Creep has been tuning me great guy he thinks it maybe internals but can find anyone local to switch out with to test.
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Originally Posted by twintzs View Post
here is the log with the upgraded hpfp relief valve. Boost_Creep has been tuning me great guy he thinks it maybe internals but can find anyone local to switch out with to test.
This opened to jiberish for me, and I am not excel smart enough to unjiberish it
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 Old 05-08-2012, 07:19 AM   #21
 
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Same..the log is in the wrong format in excel...can't read it.
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 Old 05-08-2012, 07:46 AM   #22
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Originally Posted by twintzs View Post
here is the log with the upgraded hpfp relief valve. Boost_Creep has been tuning me great guy he thinks it maybe internals but can find anyone local to switch out with to test.
I've pulled some failing KMD's to find they looked perfect. That pressure drop looks like internals, rather than a relief valve issue.

@Boost_creep

PS - The data log he posted just needs to be parsed by using the "Text To" function in Excel.
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 Old 05-08-2012, 08:32 AM   #23
 
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well, I just took off the spill valve and it looked perfect. No gunk or anything not that I was running E85. I only us 93.

Originally Posted by phate View Post
I've pulled some failing KMD's to find they looked perfect. That pressure drop looks like internals, rather than a relief valve issue.

@Boost_creep

PS - The data log he posted just needs to be parsed by using the "Text To" function in Excel.
@phate

Any way to test the internals? I just bought the upgraded relief valve and dont have the money to drop another $300+.

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 Old 05-08-2012, 08:33 AM   #24
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Originally Posted by twintzs View Post
well, I just took off the spill valve and it looked perfect. No gunk or anything not that I was running E85. I only us 93.


@phate

Any way to test the internals? I just bought the upgraded relief valve and dont have the money to drop another $300+.
Put your stock ones back in.
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 Old 05-08-2012, 08:42 AM   #25
 
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Originally Posted by twintzs View Post
well, I just took off the spill valve and it looked perfect. No gunk or anything not that I was running E85. I only us 93.


@phate

Any way to test the internals? I just bought the upgraded relief valve and dont have the money to drop another $300+.
Brian,

If you still have your warranty card, kmd should replace them for you. I personally have not had to go down that road, but it appears others have.

Did you call kmd yet?
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 Old 05-08-2012, 08:50 AM   #26
 
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Originally Posted by Boost_creep View Post
Brian,

If you still have your warranty card, kmd should replace them for you. I personally have not had to go down that road, but it appears others have.

Did you call kmd yet?
I talked to some guy who sounded like a prick. Kept calling me bro and just told me that it could be a number of things and he couldnt diagnosis over the phone. Based on searching it appears i need to talk to a Mara at KMD.
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 Old 05-08-2012, 08:57 AM   #27
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Originally Posted by twintzs View Post
I talked to some guy who sounded like a prick. Kept calling me bro and just told me that it could be a number of things and he couldnt diagnosis over the phone. Based on searching it appears i need to talk to a Mara at KMD.
Tell them you know and they know this is a common problem caused by their bull shit.
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 Old 05-08-2012, 08:58 AM   #28
 
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Originally Posted by twintzs View Post
I talked to some guy who sounded like a prick. Kept calling me bro and just told me that it could be a number of things and he couldnt diagnosis over the phone. Based on searching it appears i need to talk to a Mara at KMD.
Yes, Mara is very pleasant to deal with. I can look back and see if she has a direct email, but I think if you just send them a general email, she would be the one who replies. I'll take a look though.

Edit- ok, I just found it. mara@kmdtuning.com
Pretty self explanatory. Lol.
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 Old 05-08-2012, 09:06 AM   #29
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Same thing happened to me, pulled my kmds and they looked fine. swapped spill valves with the kmds still in the pump and the problem went away for a couple pulls and came back.

I ended up putting in a new pump with AT internals and no problems since then but I still think my in tank is going out because even at wot my pressure dips to 1650.
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 Old 05-08-2012, 09:16 AM   #30
 
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Originally Posted by eric@edgeautosport View Post
Same thing happened to me, pulled my kmds and they looked fine. swapped spill valves with the kmds still in the pump and the problem went away for a couple pulls and came back.

I ended up putting in a new pump with AT internals and no problems since then but I still think my in tank is going out because even at wot my pressure dips to 1650.
Where is your pressure dropping to 1650 above the 4k range or below even with the AT internals?
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 Old 05-08-2012, 09:25 AM   #31
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let me see if I can find some recent logs


Seems like pressure isnt dipping anymore so it looks like it was the pump/spill valve
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 Old 05-08-2012, 10:48 AM   #32
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Autotechs ftw. 11k miles and counting.
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 Old 05-08-2012, 10:54 AM   #33
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Btw, just had a local nator guy install his ptp fp internals, and his fp is dipping bad.
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 Old 05-08-2012, 12:49 PM   #34
 
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We have a local 3071 car that had PTP internals and had to ditch them for another option...They just wouldn't put the pressure out that was needed. DJ was tuning the car actually. The internals were an older batch though, so maybe they have changed.

Originally Posted by G26 View Post
Btw, just had a local nator guy install his ptp fp internals, and his fp is dipping bad.
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 Old 05-08-2012, 12:51 PM   #35
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Internals are hit and miss, no matter which way you go. I've worked with several cars with PTP pumps that work great, as well as KMD, CPE, and AT.
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 Old 05-08-2012, 04:12 PM   #36
 
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Honestly, this is a rather unfortunate thing ...but yes it is true.

Originally Posted by phate View Post
Internals are hit and miss, no matter which way you go. I've worked with several cars with PTP pumps that work great, as well as KMD, CPE, and AT.
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 Old 05-08-2012, 06:17 PM   #37
 
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Just a random thought could the low pressure be how I'm taking my logs. I get into 4th gear cruise until I get to 2500 RPMs then I hit the log button on the AP then I stomp on the gas to 6500/7000 rpm.
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 Old 05-08-2012, 06:23 PM   #38
 
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No.

Originally Posted by twintzs View Post
Just a random thought could the low pressure be how I'm taking my logs. I get into 4th gear cruise until I get to 2500 RPMs then I hit the log button on the AP then I stomp on the gas to 6500/7000 rpm.
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 Old 05-08-2012, 07:43 PM   #39
 
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Originally Posted by G26 View Post
Btw, just had a local nator guy install his ptp fp internals, and his fp is dipping bad.
yup thats me..asked John at PTP for a refund and ordered AT fp internals from Edgeautosport . I know two guys on here that have the PTP fp internals for 30k miles on E85 without an issue
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