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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 02-22-2019, 01:06 PM   #1
 
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Default Fuel pressure drops at idle

What's up guys? I'm new here and have searched all through the forums for help with my situation. My 2008 speed 3 starts and idles for about 5-10 minutes and then drops fuel pressure. From reading the forums I changed pretty much everything in the cars fuel system. I upgraded stock intank pump to a deatschwerks pump, I changed the regulator and filter, I got a used HPFP with my old corksport internals, and I changed the relief valve as well. I'm getting 12v on everything, except the circuit relay in the fuse block. On that I'm getting 10.5v. I noticed that when the coolant temp hits about 145 the car starts to drop fuel pressure. I cleaned all of the grounds and went as far as changing the crank angle sensor. Any help would be appreciated!

I'll attach a log from idle before it shut off.
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 Old 02-22-2019, 03:53 PM   #2
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I'm a little confused. Are you using known good HPFP internals?
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