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: caint get my fuel pressure up big country 74 08-18-2008, 06:25 PM i have efi live and a ppe race valve. we tried the shim kit and now the valve and even the stocker valve again and i cant get over 19,000 on my fuel rail. weve tried everything we could think of i know i need a lift pump but i used to be able to run about 23,000 now i caint even get close any ideas would be great camcojb 08-18-2008, 08:54 PM have you changed your pulse width? Also, dirty fuel filter would be an issue. Jody big country 74 08-18-2008, 09:27 PM new fuel filter and yes we have adjusted it it got me about 1500 on the rail but i cant get above 20000 anymore. is there a chance my cp3 going out i mean no dtc but it just wont get up there camcojb 08-19-2008, 04:20 PM new fuel filter and yes we have adjusted it it got me about 1500 on the rail but i cant get above 20000 anymore. is there a chance my cp3 going out i mean no dtc but it just wont get up there I was asking if you'd changed tunes and bumped the pulse width up a lot. Like going from a tow tune with say 1900 US to a race tune with 3000 US. Without a lift pump your rail would almost definitely drop as it can't keep up with that much of a shot. What pulse width is in your tune at wot? Jody | ||