Quote:
Originally Posted by BR3W CITY
Fuel pressure is pretty much the first thing you need to check.
Are you running multiple fuel filters (in and out, or a prefilter and a postfilter)? If so, what micron?
A fuel pump being loud usually means its straining. If its having a hard time drawing fuel due to a restriction or mounting issue, it'll get loud. Same goes for if you have a blockage in the line, the pump will strain to push its volume past the restriction.
Also doublecheck and reground the fuel pump wiring. Bad connections or thing supply wiring can force the pump to draw less voltage than it wants, which will make the pump run very weak.
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I pressure tester my fuel system and got these results...
Fuel pressure was initially 58 psi and with the fuel pump running with the engine off, the fuel pressure slowly decreased. When I started the truck. Fuel pressure was around 50 psi and when I revved the motor it would spike to around 60 psi. As the motor ran longer the same symptoms occurred as with the engine off. The fuel pressure slowly decreased and when revved still spiked but no longer to 60 psi.
Any suggestions on what to do?