For a reminder, the jeep runs great, but when I go to start it I need to double crank it, or crank it for about 10-15sec before it will start. Thus it sounds like the ball check valve in the fuel pump is going bad; letting the fuel drain back to the tank.
Nope it doesn't seem t be a bad check valve. The darn fuel line should be pressurized immediately.
This is my thoughts, if the valve is bad, then the new check valve would keep enough fuel in the line to start the jeep on the first try and the pump SHOULD keep up after the jeep is started.
Yes, the valve should help to keep pressure in the line. But would it be enough to keep the engine running at idle while the pump comes up to full pressure, or would the fuel line loose pressure faster than the pump can supply (which seems to be the case).
Also if it is the check valve, the line between the tank and the new valve could easily be checked for fuel. If the jeep dosnt start right up the first try, then the problem isnt the fuel pump.
No, not correct. It could be the fuel pump, it could be a pinhole in the fuel line, it could be the regulator, it could be the CrankshaftPostionSensor (long crank times are a classic failure sign.)
Also if the pump is good and just the check valve is bad, then isnt it silly to throwout a good pump.
Yes, except that you don't know the fuel pump is good.
Or is this one of those things that the check valve goes bad 1k miles before the pump compleatly dies?
I've yet to hear about an anti-drain-back valve failing.
So what can you do? Not a heck of a lot without dropping the tank. You could try a some SeaFoam but I doubt it would do any good at this point.
Pull the tank, swap out the assembly and be done with it. This problem will let you down at some time, and that's going to cost you time, money, effort, and grief. Do it right the first time, it's not an area to kludge back together.