Fuel pressure question
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Junior User
Joined: Mar 2007
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Fuel pressure question
I've seen it somewhere in one of the threads regarding fuel pressure. Can you adjust it on the stock lift pump? And if so how much pressure is ok to go up to ? Can there be an increase in overall power and throttle response from increasing the fuel pressure? If possible can someone tell me how to adjust it on the lift pump? Thanks guys.
Aaron
1975 F-250 390FE eddybrock performer package, headers, 35s
1994 F-250 turbo diesel idi, reg. cab, 5 speed, boost, pyro gauges, 4 inch stacks
Aaron
1975 F-250 390FE eddybrock performer package, headers, 35s
1994 F-250 turbo diesel idi, reg. cab, 5 speed, boost, pyro gauges, 4 inch stacks
Senior User
Joined: Feb 2007
Posts: 426
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From: Pukalani, HI
Stock is around 7psi @ max RPM and the IP can only take up to about 9 or 10psi before damage occures to the seals. Some have said they noticed a slight increase in power after switching to an electric lift pump, but they may have had a very worn lift pump before.
Post Fiend
Joined: Nov 2003
Posts: 21,285
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From: Nutter Fort, WV
Running higher fuel pressure into the injection pump changes the timing.
Higher pressure = advanced timing
Any power gain seen is probably from the advanced injection timing unless the stock lift pump was weak with either fuel amount delivery or pressure.
Higher pressure = advanced timing
Any power gain seen is probably from the advanced injection timing unless the stock lift pump was weak with either fuel amount delivery or pressure.
