Fuel Pressure Dropping fast after shutdown

[eclpsegsx12]

i was a walbro 255 lph pump, 780cc injectors and a buschur FPR for my reg. i was on the dyno and we noticed when i shut my car off my fuel pressure would go to 0 in a few seconds and not maintain pressure like it should have. What do you think the problem is? I should maintain 30-40 psi for 30 or so minutes i thought after shut down.

 

[steve]

From what I've seen the aftermarket AFPR's leak down pressure much faster than the stock FPR. I wouldn't worry unless you have problems building pressure on starting or have signs that it's the injectors leaking not the FPR.

Steve

 

[eclpsegsx12]

ok cool....it doesnt take long to build pressure....its actually really fast but the fact that it dropped so fast worried me a little

 

[steve]

My Spoolinup AFPR drops pressure in about 10 mins. To double check it was the AFPR and not the fuel pump outlet or an injector leaking I put the stock FPR back on and it held pressure. If you search you'll find several threads from people with SX and Aeromotive regulators commenting on how fast they leak off the fuel pressure when shut down.

Steve