well about a month a go my truck was pushing 20 psi of fuel pressure at idle and 12 at wot but now my lift pump idles at 15psi and now i barely get on it my fuel pressure goes to 10 really easy what could make my lift pump start to not push as much fuel ?

 

Have you tried changing the fuel filter? It's a pretty cheap fix if that's the problem.
Is pressure confirmed by a mechanical gauge? Pressure sensor may not be reading correctly.

 

well i thought it was my fuel filter too but i changed it and it did not change nothing?

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i got a glowshift fuel pressure gauge.

 

Glowshift = Junk

 

their not junk theirhas to be something wrong with my lift pump to not push as much fuel pressure is their any way i can know for sure?

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none of my gauges are messing up its just my fuel pressure is lower. my gauge is accurate. could this be a problem i have been having electrical issues and could it be messing with my lift pump to not push as much fuel?

 

if you have a bad or loose ground it will not give it full power i would think

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does the pump sound weak ?

 

check all connections. make sure of good filter. be positive your gauge is reading correctly. check voltage of lift pump.

 

have you checked your fuel pressure against a mechanical gauge to be sure it's working correctly? the ddrp could be going out or have something stuck in it. These pumps need a pre-filter on them. and yes glow shift= junk. They are not very accurate.

 

I tried a DDRP on my truck for a short time, it idled at around 20 but I could not even try WOT without it dropping to below 5 even on the stock setting on my juice.

 

well i guess i have an in tank pump and a ddrp because with my 65 hp injectors and edge comp before i was having problems with my fuel pressure i could put my comp on lvl 3 and i could get on it hard and it would stay at a strong 10 or 11 but now with my comp box turned off and giving it middle fuel it goesm down to 10 really easy. ????????????

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is it just me or does a fuel box give power to the truck even if it is turned off???????

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what should be my voltage on my lift pump and how can i check it?