Originally Posted by steverino
I have a '98 Dodge Ram 4x4 5.2L with 214,000 miles. You have a '99. I am going to assume for sake of argument that you have the factory original fuel pump and that your truck has well over 100,000 miles. Point 1: Trucks and Cherokees from this time period are known to have issues with the check valve in the electric fuel pump at about 100,000 miles if not sooner. My friend at work had a Cherokee with this issue. The purpose of the check valve is to hold fuel line pressure. This is why when you start up a truck with fuel injection it instantly roars to life with very little engine cranking. My friend's Cherokee would have to turn over like a half dozen times before it would start. Point 2: My factory original electric fuel pump died at 165,000 miles. I was told that they don't normally last that long. Dodge sells a kit to repair the check valve. But wouldn't it be smarter to put in a new electric fuel pump if you can afford to go that way? Nobody likes to take gas tanks in and out of vehicles. Something to think about.
The pressure will bleed down over the course of a few hours. The main point in the valve is to retain the fuel in the lines. The fuel pump runs for a couple of seconds when the key is switched on in order to rebuild lost pressure.