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Old 09-12-2012, 04:14 PM
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Fuel Pressure Question?

I am running about 76 to 78 pounds of fuel pressure.Is this too much to run on a daily driver? Mods are 4" exhaust,AFE stage 2 intake,GTP38R turbo,fuel rail crossover,Walbro 392 inline fuel pump,DP tuner,boost fooler, etc. Injectors are stock.
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Old 09-13-2012, 12:06 AM
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Yeah, to much fuel pressure. It should be around 65ish.
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Old 09-13-2012, 04:44 AM
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Will it hurt my truck?
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Old 09-13-2012, 07:50 AM
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Will start blowing out seals.
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Old 09-13-2012, 08:15 AM
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How hard is your truck to start with the pressure that high? Whenever my truck is hard to start, almost to the point where it sounds like a dead battery when trying to start, i'll pop the hood and see my fuel pressure is 72-74 psi. If I turn it down to about 68 psi it'll crank right up no problem. At OP temp i'm running about 65 psi.
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Old 09-13-2012, 09:29 AM
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It starts fairly easy.I have fuel rail crossover and probably have the wrong spring installed.When I'm idling it runs 76 to 78 psi.Cruising it may drop to as low as 72.
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Old 09-13-2012, 11:13 AM
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Its not going to blow up... Its not going to blow seals... It over works the pump is about it.

It can cause leaks in the fuel bowl...

Every injector likes a different fuel pressure... I ran stock injectors for years at 72 psi... Then 180/80's at 62, then 238/80's at 68 and 250/200's at 64...
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Old 09-13-2012, 12:02 PM
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^yep. this is correct.
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Old 09-14-2012, 04:20 PM
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So to be safe it probably would make sense to lower the fuel pressure a bit?When lowering fuel pressure don't you lose some horsepower?More fuel means more power.That is what Ive always thought.
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Old 09-15-2012, 05:57 AM
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There's really nothing "unsafe" about an additional 10lbs of fuel pressure, I'm not sure I see a downside, with the possible exception of working the pump a bit harder.

The boost in pressure has no HP advantages as the pressure delivered to the cylinders is controlled by the injectors using the HPOPs output and what that "intake" fuel pressure is to the injector becomes insignificant. The advantage might be, because the 8 & 6 cylinders fire in sequence, making fuel delivery to the #8 slightly starved, you want the most fuel available there.

I doubt, on a stock truck, it makes any difference though
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