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Old 09-12-2009, 10:56 PM   #1
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no fuel pressure under boost
Well, I was trying to get my car tuned today and the car ran fine,but as soon as it went into boost the fuel pressure gauge is showing the fuel drops to zero.
I have recently around 2 months ago changed my pump over to a bosch fuel pump from tpis.com. My setup also is 42lb svo injectors with with holley adjustable fuel regulator with procharger fmu. i am running stock fuel lines and stock fuel filter. any ideas anyone? other info on the car is in my sig.
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Old 09-13-2009, 05:06 AM   #2
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Re: no fuel pressure under boost
are you using a booster pump ?? you could be using all the fuel in the line and psi is dropping what model pump
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Old 09-13-2009, 10:56 AM   #3
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Re: no fuel pressure under boost
It's a Bosch pump from tpis that is rated to hold up to 850hp
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Old 09-14-2009, 01:29 AM   #4
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Re: no fuel pressure under boost
ok how about when your driving along how much pressure do u have then? u have a fuel press. gauge in the car?
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Old 09-14-2009, 11:19 AM   #5
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Re: no fuel pressure under boost
when i am driving along i have around 60 to 70 then when i nail it it drops down to zero,but recovers real quick.
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Old 09-14-2009, 02:46 PM   #6
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Re: no fuel pressure under boost
sounds like the fmu is bad or not hooked up correctly def. don't wanna lean any car out under boost
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Old 09-14-2009, 03:24 PM   #7
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Re: no fuel pressure under boost
Also check the lines so they dont are squezed or bent, so they are a restriction for the flow..
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Old 09-14-2009, 05:34 PM   #8
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Re: no fuel pressure under boost
you don't need a regulator and FMU. If you are going to tune it in the computer, throw away the FMU.
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Old 09-17-2009, 07:18 PM   #9
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Re: no fuel pressure under boost
if he doesnt use a regulator what controls fuel pressure?
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Old 09-17-2009, 07:37 PM   #10
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Re: no fuel pressure under boost
The FMU is a fancy fuel regulator. It increases the fuel pressure as it senses boost.
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Old 09-17-2009, 07:37 PM
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