Thank you, Troy.
Troy tried out a fuel line check valve - something to cure the long cranking time before starting some cars have. This happens when the pressure regulator on top of the fuel tank allows the fuel line to drain the fuel back into the tank. When you attempt to re-start your car, the fuel pump only runs for a second if it senses the engine is not running (a safety feature.) So there you are, cranking and cranking, and the fuel pump is cycling on and off, taking a long time to refill the fuel line, and a long time to eventually restart.
I made a check valve that installs just after the fuel filter, using standard Chrysler fuel line connectors. This would keep the fuel line full, and avoid having to spend ~$600 for the fuel pump module and ~$300 labor in an RT to get through the trunk wall. The valve can be permanent, is removeable, and requires no tools or special skills to install. Worked fine on some cars, but caused leaks in others as the hot fuel in the engine manifold wanted someplace to expand to, but now had nowhere to go. Troy bought one, it solved his starting problems (so at least was a good diagnostic tool) but was one of the unlucky ones and had a fuel line leak.
So back to the drawing board for me. The new version starts with a check valve, but now includes a miniature relief valve in the opposite direction. It will allow full flow and full pressure when the pump is running, as before, but now, like a radiator cap, bleed pressure on the downstream side when the pump is off. With a pressure gauge on the manifold you would see 49 psi when running, but drop and hold at 25 psi when shut off. Then, like all cars, drop to zero over the next few hours, but hold liquid in the fuel line. The fuel pressure should jump back to 49 psi as soon as you turn the key, probably quicker than the engine starts (which is typical.)
Troy, I wish it would have worked out that I could send you one of the new valves to fix you up, but I've read you already replaced the fuel pump module. There are two other problem cars I know of that are "testers" to make sure it all works as planned, and then it'll be available again. Unfortunately, it's more time to assemble, so price is still TBD.
