lpaulabbott said:
i crimped my return line and it shot to 85# are you saying my regulator is bad.
Seems to be a little confusion on the crimping of fuel lines here.
If you crimp only the return line and energize the pump, you will see a very high psi reading at the fuel rail..there is simply no place for the fuel to go so pressure will rise. When you turn off the pump, leaving the return crimped, you should see that pressure remain unless there is a leak somewhere in the line or a leak inside the tank like the clamps not on good, or the pump check valve is bad...none of which sounds like gnmike87s problem.
To isolate the pump check valve or inside tank leak from being the culprit, energize the pump and only crimp off the supply line...you should see pressure at the fuel rail of around 40psi, if it never gets to 40 psi before crimping the supply line, then the regulator is most likely bad. If once the supply line is crimp and pressure drops quickly, you either have a bad regulator or a leaking injector.
In order to determine if its a leaking injector or bad regulator, energize pump (provided that you did reach 40psi) and crimp off both supply and return...if pressure drops then an injector is leaking.
Using this technique, you should be able to determine where the pressure is not holding...inside tank from either a leak or check valve, at the injectors, or at the regulator. But of course, you have to be able to produce at least 40psi before you can do this....if you can't get 40psi, I'm betting on a split hose or bad hose connection inside the tank on the supply line.....
I had that problem cause when I installed the Walbro I cut off the supply line metal nipple where it necked down, and when I slipped the rubber hose over the part I cut off, the edge was sharp and split the hose, causing a similar problem....had to drop the tank again...
