How do you change a fuel pump on a 1993 Isuzu Trooper?

Answer 1

You have to remove the fuel tank. Keep in mind there are 2 differant fuel pumps listed for this year trooper.Make sure you replace it with the correct one. One has a two inch turbine the other one inch. I went and got the Chilton Isuzu manual for step by step replacement.It was worth the 9$.

I have a 93 Isuzu trooper LS and just replaced the fuel pump. Both the 1 inch and 2 inch pumps are rated the same as far as 43 psi and gallons per minute. I bought the cheaper 2 inch since it had all the necessary rubber isolators to install the pump. The price for the 1 inch was roughly $250 and 2 inch was $100. Both the pumps were significantly smaller in size than the original. Removing the tank was actually fairly simple. Make sure you clean out all the grime around the bolts and use some WD-40 to loosen bolts on tank. Left side was a pain to get up in there with a socket, have patience and make sure you jack the back end up high enough to get up under there. That was the hardest part. It took me 1 hour to drain and remove the tank and about 30 minutes to put it back together. My trooper has been running wonderfully ever since. I will say it took me about three days to diagnose the problem from start. I backed out drive way and the trooper stalled like it was out of fuel. I replace relay, fuses, and installed a fuel pressure gauge just before the rail to check psi. It was zero. I thought I accidentally hooked it up to the return line. But finally when I removed the tank and pump, I hooked the pump back up inside a 5 galllon bucket and had buddy turn it over. Nothing came out the pump. It was caput...... I did the same with the new pump before installing in tank and it was shooting out like a hose...... Deffinitely the pump......