vltrue

How hard is it to change a fuel pump on a 90 cherokee laredo 4.0. Not 100% its the fuel pump. Changed the map sensor,plugs,wires,cap,rotor. Starts up but doesnt idle.

mike albo

Did you try cleaning the IAC?

vltrue

No....its been running fine for about a week. But today it wont stay running.
Before this, its was running fine for awhile too. Its been doing this on and off for a long time.

mike albo

check or have the fuel pressure check,that will tell you for sure if it is or isn't the fuel pump

vltrue

If it is the fuel pump. Why does it run one week then not start at all. Then let it set for a week or two. Then it runs for awhile. Then it wont start.....? Would a fuel pump work then not...then work again

mike albo

Yeah,its electric,it will cut in and out

vltrue

How hard is it to swap one out? Any suggestions?

mike albo

I haven't done one yet,it should be pretty easy though.If i'm thinking right yours like mine is on the passenger side next to the fuel tank.2 wires and a couple hose clamps,along with the mounting bracket.

duncan0668

I just spent the last 4 weeks going through the same thing. It will start and run ok and you can drive it on short trips but drive it more than about 70 miles and will die on me. I could drive it on a short trip and go to start it later and no go. I could start it and 15 minutes later would not run. Let it sit over night and fire right up. I changed every thing but the pump and no deal. I finally got stranded away from home and had to tow it to Jeep dealer. They originally blamed the ignition and replace everything in that group. Then it stranded them after they thought it was fixed. The fuel pump would quit after about 45 minutes of running. They replaced the pump and I have put about 250 miles on it and runs great. However the repair cost as much as some of the Cherokees on this blog.

vltrue

That sucked.......! Thanks for the info guys!! *keep the rubber side down*

electricfuzz

thats too bad about all the repair costs! The fuel pump is super easy to replace, dont even have to drop the tank! Just thought I would share my experience with the fuel pump. a fuel pressure test showed it to be pretty low, I could drive fine as long as I didnt need any power (hard accelerate, up hill, etc..) but would bulk at the worse times (like trying to merge onto a highway with nearly no acel. lane). I took the fuel pump assembly (pump, float, fuel level sending unit) out of the tank (can get the whole assembly for around $130, but was going to order just the pump for much less). Aftyer removal, I noticed a fuel hose clamp was lose and the hose was not pushed down tightly over the pumps outlet nozzle. Fuel was be pumped at the right pressure but a portion of that fuel was spilling right back out (fortunately back into the tank). A simple fix did the job this time! SO, if you are reading low fuel pressure, check the fuel pump assembly (check this hose for deteriation as well) before spending your money!