EFIDynoTuning Forum

So I have upgraded my fuel system to -8 lines and rails. Although I incorporated the factory PPRV in line from my aftermarket (coyote) fuel pump I am still seeing 100+ psi fuel pressure when keying to the on position. This is unsafe and also a mechanical issue preventing me from tuning start ups nicely. Does anyone have a recommendation on a replacement pressure relief valve that I can use in the fuel tank? I have thought about doing an external valve right outside of the tank but I feel like this just exacerbates the need for additional plumbing unnecessarily… I’m looking for some more experienced input please.

Thanks,
Mike

My regulator is right outside the tank. I run 60psi, it works great.

why not use the factory marauder pprv ?

Update for fyi only: The factory marauder PPRV is integrated properly I believe. (Not something I wouldn’t have thought out and integrated well). And so, it just can’t handle the coyote pump imho. I went ahead and used a Holley filter regulator assembly set to 60 psi and plumbed a -8 return line to a bulkhead fitting at the sending unit hat. Then, reduced fuel pump prime time. I will call it success because it is now safe and pressure is stable. The Holley part wasn’t expensive looks clean and fits in the factory fuel filter bracket.

I take it your referring to one of these ? https://www.summitracing.com/parts/hly- ... 2731186257

It sounds like your pump voltage is set too high. You should be able to reduce it so you get no fuel pressure at key on if you wanted to.

Yes, I believe that is the specific part I installed.


I do need to work on my pump voltage table as well, thank you for that information