[32commanche]

hey guys I have a chance to buy a 90 comanche with the 4.0. Im trying to find out of the fuelpump is bad or the injector. it runs fine as long as you have your foot on the gas but if you have to stop it will die. when you pull up to a astop sign you have to have one foot on brake and one one gas keeping it revved im thinking the fuel pump is bad cuz it only has 11 pounds of pressure. but ive read on here there notorious for injectors leaking

[cruiser54]

Obviously the fuel pump is bad or the hose in the tank for the fuel pump is deteriorated/cracked. Hard to narrow it down from there to injectors at this point.

[mj40]

sound more like the idle air control on the throttle body isn't working right or dirty...things to check..

iac
plugged fuel filter
vacuum leaks
possible ignition-wires/plugs weak spark..

[cruiser54]

Originally Posted by mj40

sound more like the idle air control on the throttle body isn't working right or dirty...things to check..

iac
plugged fuel filter
vacuum leaks
possible ignition-wires/plugs weak spark..

If it only has 11 pounds of fuel pressure as stated in the original post, I think I would start there. Just sayin'.

[32commanche]

yeah i think im gona start with the pump a mechanic said it was supposed to have around 30lbs i think. would this truck be worth 500.00 it has 120,000 miles and a little rust its been in the inlaws family since it was new