register gallery

Go Back   Mazdaspeed Forums >
Mazdaspeed 3/6 MZR Gen1 Forums (2006-2009)
> Mazdaspeed3/6 General Discussion

Welcome to Mazdaspeed Forums .

You are currently viewing our boards as a guest which gives you limited access to view most discussions and access our other features. By joining our free community you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is fast, simple and absolutely free so please, join our community today!

If you have any problems with the registration process or your account login, please contact contact us.

*When you join MSF as a registered user, there will be No Ads.

*Registered Members get access to the Off Topic Area of the Forum

*Registered Members have an opportunity to upgrade their accounts to VIP, which brings a host of goddies for supporting MSF such as Raffles, Additional Forum Access, More PM Storage, The ability to upload more Images and many other enhancements.

*Registered members also get access to the live chat box!
Bookmark and Share LinkBack Thread Tools Search this Thread Display Modes
 Old 09-15-2018, 05:00 PM   #1
ParkerV2's Avatar
Join Date: May 2018
Location: Dallas Texas
Posts: 11   (View Stats)
iTrader: (0)
Rep Power: 0
ParkerV2 is an unknown quantity at this point
Thanks: 2
Thanked 0 Times in 0 Posts
Groans: 0
Groaned at 0 Times in 0 Posts
(Thread Starter)
Not Ranked  0 score     
Default Fuel Pressure Issues

Need some geniuses to help me figure out an issue with my car before I give up and sell it.

Two months ago I was having a fuel cut when I would go WOT above 4k ish. I was running a datalog while testing it and my fuel pump completely shit the bed. Voltage went to 0 and HPFP PSI also went to 0. The log is here:

After replacing the relief valve and a brand new HPFP With internals, my fuel psi now fluctuates with rpm but won't go above 1000. MY HPFP Voltage is still at 0. After taking it to 4 different shops including a Mazda dealership these are the things I have replaced, and still have 0 HPFP Voltage and car runs like shit,
-HPFP with internals
-Relief Valve
-Fuel Rail Pressure Sensor
-In tank Fuel Pump
-Bought a used ECU and had Mazda program the immobilizer to let the car start
- Been through two batteries while the car has been down because of mechanics leaving my AP on and draining the battery
-I've also tested the spark plugs by unplugging one at a time while the car running and they all seem to working fine.

Currently, the car idles, but won't build boost or drive good because my fuel pressure never goes above 1000.
A guy named Justin Henry who works on speeds all day said he checked my wiring and it seemed to be good and said I was getting an error between my PCM and fuel pump, that is when I replaced my ECU.
Any ideas on any tests I can do would be much appreciated.
ParkerV2 is offline   Reply With Quote
 Old 09-15-2018, 09:09 PM   #2
Solarsurge's Avatar
Join Date: Apr 2016
Location: Richmond, VA
Posts: 571   (View Stats)
iTrader: (0)
Rep Power: 0
Solarsurge is the leader of the worldSolarsurge is the leader of the worldSolarsurge is the leader of the worldSolarsurge is the leader of the worldSolarsurge is the leader of the worldSolarsurge is the leader of the worldSolarsurge is the leader of the worldSolarsurge is the leader of the worldSolarsurge is the leader of the worldSolarsurge is the leader of the worldSolarsurge is the leader of the world
Thanks: 24
Thanked 120 Times in 95 Posts
Groans: 0
Groaned at 1 Time in 1 Post
Not Ranked  0 score     

Posting old logs is great and all, and we can see the failure, but posting a current log would be more helpful so we can actually see what it's doing now. There are a few things I can see in your post that don't make sense...

1. I have left my AP on in my car for like 2 weeks. I HIGHLY doubt that's going to drain your battery very quickly.
2. I see no mention of fuses or relays being checked.

Power to the in tank pump/regulator flows like this:
Battery+ => 25A Fuel Pump Fuse => Fuel Pump Relay (CIRCUIT) ==> Fuel Pump Ballast Resistor => Fuel Pump Speed Control Relay (FUEL PUMP) ==> In Tank Pump

To test the resistor ballast, disconnect the battery - terminal and remove the ballast from the car. Check for continuity with multimeter by touching test leads to the resistor pins. According to the manual, resistance should be .304-.336 ohms at 68 deg F. Now, I can tell you from personal experience that literally any one I have ever tested has been between 1.2-1.6 ohms, so I think the manual is wrong or the meter I use just sucks at measuring resistances that low. Either way, if you're in the ballpark, you're fine.

To test relays, the relays are the 2 blue relays next to each other in the fuse box. On the relays, there are 4 pins. With the short sides of the rectangle being top and bottom, there 2 are vertical brass pins next to each other at the top and 2 horizontal copper pins on top of each other at the bottom like this:

| | <--Brass Pins
__ <--Copper Pins

The brass pins are the leads you want to test with a multimeter. Touch positive and negative leads from the multimeter to those pins (doesn't matter which) and they should read around 70-80 ohms. Next, just take wires from the battery + terminal to the left pin and battery - terminal to the right pin. It should click. If it doesn't you've found your problem.

Fuses, I'm pretty sure you don't need instruction for. If you do, please sell the car lol

Last edited by Solarsurge; 09-15-2018 at 11:19 PM. Reason: I'm retarded at times.
Solarsurge is offline   Reply With Quote
 Old 09-17-2018, 05:38 AM   #3
MSMS3's Avatar
Join Date: Jun 2009
Posts: 2,595   (View Stats)
iTrader: (0)
Rep Power: 1083
MSMS3 is the leader of the worldMSMS3 is the leader of the worldMSMS3 is the leader of the worldMSMS3 is the leader of the worldMSMS3 is the leader of the worldMSMS3 is the leader of the worldMSMS3 is the leader of the worldMSMS3 is the leader of the worldMSMS3 is the leader of the worldMSMS3 is the leader of the worldMSMS3 is the leader of the world
Thanks: 1,360
Thanked 1,859 Times in 1,007 Posts
Groans: 144
Groaned at 47 Times in 31 Posts
Not Ranked  0 score     

I'm not sure a WOT log is a good idea right now. If rail pressure is only 1000 psi, it is not safe to do a full log. The above suggestion regarding resistor ballast and relay function is a wise one. Do that and see if it passes those tests.

As to the new pump, did it come with upgraded internals or did you install them yourself? If you did the install you might want to retrace your steps just in case. You must do the assembly under super clean conditions to avoid contamination. Be sure to carefully inspect the o-ring. Be sure you didn't damage it when installing the piston assembly, and be sure it is well-lubed with engine oil when you reassemble the pump.
2017 Audi Q5 3.0 T (supercharged) Stage 2+ EPL tune, JHM overdrive crank pulley, EPL supercharger pulley, ZF8 TCU tune, aFe/034 intake, modified air box. 480 hp.

Sunlight Silver '08 MS3 GT Mods: (Sold 1/25/2019 after 10 years of ownership)
BNR Stage 1 (to fix smoking K04 turbo), TurboXS 3" Catless DP/RP "Stealthback" into stock CBE, Vibrant 3 inch Ultra Quiet Resonator in RP section, Magnaflow 3 1/2" exhaust tip, Mazdaspeed CAI w/air straightener and K&N conical filter, NGK 6510 Iridium IX one step colder plugs, Hypertech tune, Autotech HPFP internals, Stock BPV (works perfectly), Yokohama Advan Neova AD08R's (stock size on stock rims); Hawk HPS pads; SURE RMM; Grimmspeed EBCS (2 port mode), Bilstein B6's, SPC rear camber arms.

Last edited by MSMS3; 09-17-2018 at 05:48 AM.
MSMS3 is offline   Reply With Quote

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On

Similar Threads
Thread Thread Starter Forum Replies Last Post
Fuel pressure issues - fed the hell up with this Xtrinsic1337 2010 MS3 - Troubleshoot/Diagnostics 15 07-10-2016 05:43 PM
High pressure fuel pump issues andrew1501 MazdaSpeed 3/6 - Troubleshoot/Diagnostics 4 11-28-2015 01:17 PM
fuel pressure issues RogerH MazdaSpeed 6 - Engine, Transmission & Driveline 12 12-05-2013 01:58 PM
Need Help: Intermittent fuel pressure issues. speed31982 MazdaSpeed 3/6 - Fuel, Nitrous & Water Injection 1 06-30-2012 03:18 PM
Need Help with Fuel Pressure Issues!! CCC Gen2 MS3 General Discussion 60 09-23-2011 04:36 PM

All times are GMT -7. The time now is 03:46 PM.
Powered by vBulletin® Version 3.8.6
Copyright ©2000 - 2019, Jelsoft Enterprises Ltd.
SEO by vBSEO ©2011, Crawlability, Inc.
Template-Modifications by TMS
©Copyright 2008 ; 2019 Cymru Internet Services LLC | FYHN™ Autosports HQ
Ad Management plugin by RedTyger
Page generated in 0.25546 seconds with 22 queries