Hello All, I need some help diagnosing a fuel pressure issue. My current walbro fuel pump and accufab FPR are about 8 years old. My fuel pressure was set to 43 line off and everything seemed to run as expected however the pressure would bleed off to 0 in just a few seconds after shutting the car off. I happened to have a dw300 sitting on the shelf so I went ahead and installed this pump. The pressure immediately jumped up to 55psi and the pressure would hold about 30psi for an hour or two after shutoff. At this point I thought everything was good.
The following weekend I turned the car on and attempted to adjust the pressure back to 43 line off however the FPR would not respond. Turning the top screw CCW to the point where it almost unthreads did not lower it all, and likewise, turning it CW didnt raise the pressure. It seems to be stuck on 50 now and when you shut the car off, it immediately drops to 10 and then bleeds off to 0 after a few minutes.
I ordered a rebuild kit for the accufab and installed the diaphragm (flat style), it still behaves the same as above but now seeps gas out of some of the diaphragm bolts. Should I just buy another FPR or do you think the issue lies elsewhere?
Also, when I add the vac line back on, it has no effect on the pressure, it still stays at 50.
The following weekend I turned the car on and attempted to adjust the pressure back to 43 line off however the FPR would not respond. Turning the top screw CCW to the point where it almost unthreads did not lower it all, and likewise, turning it CW didnt raise the pressure. It seems to be stuck on 50 now and when you shut the car off, it immediately drops to 10 and then bleeds off to 0 after a few minutes.
I ordered a rebuild kit for the accufab and installed the diaphragm (flat style), it still behaves the same as above but now seeps gas out of some of the diaphragm bolts. Should I just buy another FPR or do you think the issue lies elsewhere?
Also, when I add the vac line back on, it has no effect on the pressure, it still stays at 50.