I see you replaced the pump but you have a return fuel system which means the regulator will route "excess" pressure or fuel back to the tank. We need to check the return system for issues including restrictions. However, I suspect the regulator may be allowing too much fuel or pressure back to the tank which causes your low pressure. The reason is, your running pressure should be a minimum of 30 PSI so it is not that far out but with a new pump you would expect it to be higher so that means one of three things. First it is a weak pump. Second, you have a restriction in the supply line, or there is a "leak" in the system allowing pressure to bleed off to the tank.
Let me know if you have questions and we can go from there. Thanks
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Saturday, April 25th, 2020 AT 11:56 AM