I have a 2000 grnd Cherokee ltd with a 4,7 ,123,000 miles on it , it runs great in cooler weather but in summer temps, 80 degrees or higher it stalls out and dies during normal driving conditions. I am a decent mechanic with 20+ years millwright experience. Car is well maintained, I have tested fuel pressure and it runs at about 60psi fuel pres. at fuel rail, replaced filter/reg twice, also has air in fuel system from pump, not sure if that is normal but sometimes when it shuts down I can bleed off pressure at fuel rail till all fuel and air is gone and it will start, other times it seems to have to cool off for a few minutes and it starts back , but in city traffic in hot weather it will repeatedly shut down, its insane, I have been able to diagnose and fix every other car I have owned except this one , PLEASE help , my wife drives it to work daily and I'm afraid she may have an accident because of it shutting down.
JA: How many miles are on the car? Have you had the fuel pressure tested recently?
Customer: I just said it has 123,000 miles odo. and I have tested fuel pressure many times , it runs at about 60 psi , normally it should be 45 to 54 psi, changed filter regulator and tested the return line to make sure it is not blocked, it was fine, but did notice air bubbles coming from return line with fuel.
JA: Are you hoping to fix this yourself? What have you tried so far?
Customer: Yes, I have changed the TPS, cam sensor, crank sensor, fuel filter regulator twice, checked fuel pump
relay, checked fuel psi many times.
JA: Anything else you think the mechanic should know?
Customer: There is nothing left other than control module and fuel pump. I am thinking about replacing fuel pump next, but not sure if it will fix the problem. With too much pressure at fuel rail and air in fuel line that seemed to be the obvious choice , but at 150 bucks aor fuel pump I want to make sure first, I'm tired of guessing. This aint my first rodeo.
JA: OK. Got it. I'm sending you to a secure page on JustAnswer so you can place the $5 fully-refundable deposit now. While you're filling out that form, I'll tell the Jeep Mechanic about your situation and then connect you two.