Bad TBI electronic fuel pump or problem with fuel tank?
I recently purchased a 1985 CJ-7 with an analog Holley Pro-Jection TBI system. It had been sitting for about a year in a garage before I purchased it. It had about an 1/8th of a tank of fuel at the time. I did not drain the tank. Instead, I filled it up with fresh gas. The tank is the 20 gallon optional plastic tank. I also live in Arizona where there is not much issue with rust.
My problem started last weekend when driving it home from a quick 20 mile trip. It started to act as if the engine was running out of gas. I barely made it home. Once home, I could no longer start it. A quick look underneath exposed an issue with the electric fuel pump mounted on the inside of the rear crossmember of the frame in front of the fuel tank. The pump appeared to be leaking. The pump looked old, so I ordered a new pump, both fuel filters, and new hose. Once I replaced everything, it still would not start. I checked the both ends of the pump at each filter and they were BOTH dry. I was able to hook up a hose and blow air into the fuel line going into the tank and I heard the sound of bubbles. I also added 5 gallons of fresh fuel in case the fuel guage was off and I was low on fuel. This did not help.
I am at a loss as to my next move in troubleshooting this issue. The pump does turn on when I turn the key to the RUN position, but stops after about 5 seconds. I have attempted to 'prime' the system by continuously turning the key on and off to no avail. No fuel is getting to the pump.
I am not sure whether I have a bad pump or not based on its behavior. Does this sound normal? Am I leaving out a step for properly installing the new electric fuel pump and filters? Both filters are exact replacements. The pump is a Walbro.
Any insight on this would be greatly appreciated.