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MazdaSpeed 3/6 - Troubleshoot/Diagnostics MazdaSpeed 3/6 - Troubleshoot/Diagnostics - Have a problem with the car? CEL Code? Want to discuss other issues? Come on in!


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 Old 02-17-2012, 07:17 PM   #1
 
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Default Fuel Pressure Drop after load of 2

My fuel pressure is falling out of the sky once a load of 2 is reached. I had KMD internals that were doing the same thing. I cleaned them, reinstalled, no luck. I've gone back to stock internals and overall my pressure numbers are better but pressure is still shitting the bed. Everything looks good in terms of hoses. Perhaps it's the relief valve? Which I can't afford to be bad right now. Outside temperature? I read somewhere it could be related to that. At idle pressure usually hovers around 400psi.
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 Old 02-17-2012, 07:31 PM   #2
 
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If your holding pressure until you hit higher loads, I would think it more likely that the in-tank pump is the problem, not the RV..

Is that log with the OEM internals or the aftermarket? It just looks like bad internals to me..
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 Old 02-17-2012, 07:34 PM   #3
 
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That's a log with stock internals, KMD internals were even worse. I could of sworn my numbers were fine before I went catless too. I have no clue what's going on.
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 Old 02-17-2012, 07:37 PM   #4
 
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Most likely the KMD's are gone, and your OEM internals aren't up to the task..
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