Idle/76psi-WOT/30psi in 3rd gear - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 4 (permalink) Old 07-04-2009, 02:57 AM Thread Starter
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Idle/76psi-WOT/30psi in 3rd gear

Fuel pressure at idle seems to be increasing with time at idle. I have an autometer sport comp guage plumbed to the back of the fuel bowl. Idle pressure 2 years ago was 70-72 psi with no mods at all to the regulator. Now it is 76 psi with the same set-up. WOT drops to 30psi. Have throttle is steady for a few seconds at a time drops 10-20 psi intermittently. 02 with 180k. Guage readings today immediately following air/fuel/oil service with new filters. I suspect a weak fuel pump and regulator springs, but would like a little more feed back before I spend money. TIA

02 F250 CC, 4X4,SB. DP Tunes stk, 80econ,120. NAPA 6637 air element. Summit 4" turboback. GDS hi-flo outlet. 1.0 turbine housing. HX cross-over. Modded pedestal. CCV mod. Fuel rails connected. AIH delete, pre-pump.
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post #2 of 4 (permalink) Old 07-04-2009, 01:38 PM
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Mechanical or electrical gauge? I wonder if the gauge itself might be getting wonky on you (the increasing fuel psi with more mileage is odd) but with that many miles, dropping to 30 psi @ WOT isn't unheard of. FWIW, with the fuel system mods in my sig, the OE high pressure pump, and a moderately healthy set of injectors, my fuel pressure drops maybe 2 psi @ WOT...

2K2 F350 PSD/ZF6, Fluidampr/Melling LPOP, AirDog/ITP RR, DP F5, Tymar/high-flow outlet/MBRP 4", Dynatrac Free-Spin hub conversion
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post #3 of 4 (permalink) Old 07-04-2009, 03:13 PM Thread Starter
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It is a mechanical guage that I had made to a heavy duty hydralic line with press fittings. It has been under the hood a long time. Is that OE pump you have upgraded or the same as what came out on them originally? I was thinking about ordering the Walbro but if there is a better one I would like to have that option to think about. Thanks.

02 F250 CC, 4X4,SB. DP Tunes stk, 80econ,120. NAPA 6637 air element. Summit 4" turboback. GDS hi-flo outlet. 1.0 turbine housing. HX cross-over. Modded pedestal. CCV mod. Fuel rails connected. AIH delete, pre-pump.
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post #4 of 4 (permalink) Old 07-04-2009, 03:50 PM
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Quote:
Originally Posted by Tyrod View Post
Is that OE pump you have upgraded or the same as what came out on them originally?
Nope--my high pressure pump is the factory unit. The AirDog probably helped a bunch (didn't put the fuel pressure gauge on until after I installed the AD) since now the main pump isn't doing all the work--now it has a helper.

2K2 F350 PSD/ZF6, Fluidampr/Melling LPOP, AirDog/ITP RR, DP F5, Tymar/high-flow outlet/MBRP 4", Dynatrac Free-Spin hub conversion
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