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Old 11-17-2021, 01:28 PM   #1
Dvroofer
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Default Pressure on the rail

I’m currently working on my setup and was looking for a solution to a fuel pressure issue on my rail. My car is a 91 240 b230f I have a dw300 intake pump running directly out the tank to a earls check valve then to braided 6an ptfe line with 6an connections. I ran the line in one piece all the way to the firewall. A 6an elbow directly into an aem flex sensor with an fittings then into my nuke fuel rail. From there it goes to my nuke fprs100 regulator with a pressure gauge into another braided line that goes all the way back to the tank. My pressure drops instantly after I turn the key off. I’m currently going through the entire system with a spray bottle while running to see if anything bubbles or sucks when I spray it. Other than that I’m kind of scratching my head. Has anyone dealt with a similar issue if so let me know what you did. I’m not sure if adding another check valve from the return would help or even do anything. Does there have to be a leak somewhere?

Last edited by Dvroofer; 11-17-2021 at 01:35 PM..
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Old 11-17-2021, 01:45 PM   #2
oldschoolvolvo
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I think it just might be how your system operates.
Does it start normally each time?
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Old 11-17-2021, 01:58 PM   #3
culberro
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Stuck open injector, FPR not seating properly, or the Earls check valve not working.
If it's not an injector being stuck open, I wouldn't worry about it too much.
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Old 11-17-2021, 02:03 PM   #4
Dvroofer
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It ran fine for a Long time on stock ecu and injectors but never held pressure.Switched to ms and brand new deka 800cc injectors been trying to get a stable start on crank. Wanted to eliminate the possibility of any vapor lock , ect. Just didn’t know if this is normal in an aftermarket fuel system.
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Old 11-17-2021, 07:53 PM   #5
RvolvoR
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sounds like your check valve isnt keeping things in check
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