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TPI Tuned Port Injection discussion and questions. LB9 and L98 tech, porting, tuning, and bolt-on aftermarket products.

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Old 08-25-2009, 05:23 PM   #1
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pressure?
whats the fuel pressure range for 1990 5.7 tpi?

i have walbro 255 pump and get from 30 -55
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Old 08-25-2009, 10:22 PM   #2
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Re: pressure?
trying to figure out if its my run ability problem. lmk guys!
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Old 08-25-2009, 11:41 PM   #3
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Re: pressure?
should be around 46 i believe
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Old 08-26-2009, 06:08 AM   #4
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Re: pressure?
all data says 40-48

but what would be up with it going all the way up to 55 and low as 31.
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Old 08-26-2009, 08:07 AM   #5
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Re: pressure?
My rule of thumb with FP:
Key on engine off 36PSI
Engine running @idle 36/40PSI
Wot set 42/48 PSI (lower longer pump life)
Shut off after running..FP should go to Zero in about one hour Estimate.

Anything else in my opinion needs looking at......
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Old 08-27-2009, 02:05 PM   #6
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Re: pressure?
thanks. when you turn the key on it puts the pressure about 46ish without running
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Old 08-27-2009, 04:27 PM   #7
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Re: pressure?
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thanks. when you turn the key on it puts the pressure about 46ish without running
Sounds good
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Old 08-27-2009, 04:35 PM   #8
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Re: pressure?
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Sounds good
Without the engine running and just priming the pump 46 PSI key on seems high.
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Old 08-29-2009, 12:32 PM   #9
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Re: pressure?
thats what i thought. noticed last night its running extremely rich so with that said im ruling out the fuel pump and continuing figuring out whats lacking or going out.

thanks guys with the help!
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Old 08-29-2009, 12:52 PM   #10
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Re: pressure?
Quote:
Originally Posted by DJP87Z28 View Post
My rule of thumb with FP:
Key on engine off 36PSI
Engine running @idle 36/40PSI
Wot set 42/48 PSI (lower longer pump life)
Shut off after running..FP should go to Zero in about one hour Estimate.

Anything else in my opinion needs looking at......
Mine goes to 46 with key on primed and runs about 43-45 at idle
and it does not run rich, block learn is 125-132.
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