FP drops fast when car is off??

[sick GN]

When I turn the car off the Fuel pressure drops to about 10 pounds or less. Also it does not pick up one pound with boost. What could be the problem?? It primes up to 40 but then falls if I don't start it right away?? Also the pressure drops about 6 punds when I reconnect the Vac line. With line off it is about 42. Need help already switched out the Fuel Pressure Reg. what else can I check??

 

[Mr URL]

http://www.gnttype.org/techarea/fuelsystem/fpsys_check.html

 

[tazgn]

It should drop a few pounds (maybe even 6 depending on your engine vacuum) when you connect the hose. It sounds like you're in the same boat as me with the dropping FP (except mine isn't consistent). Sometimes mine will drop to 0 before I can even get out of the car while others it will stay at 45 for hours... I just gave up on it since the car still starts right up (FP comes up instantly when I turn the key) and FP works great under boost... I've just got a small leak somewhere (and my fuel system is ALL home made with AN fittings everywhere...)

Derrick

 

[gnXfan]

Could be leaky injectors. Any issues starting the vehicle?

 

[sick GN]

I found the problem, it was in the tank. The fuel line that connected the pump to the sending unit swelled and one of the clamps broke. So that is why it wouldn't hold pressure. Thanks for all of your help.