rickybarth

i just put a new airtex pump in my 1997 gc and it dosent hold pressure,has anyone had problems with airtex fuel
pumps,i guess im returning it tommorw


ok so i just put a new fuel pump in and i got code 42 what does this mean i dont really understand this.
42 Automatic shutdown relay circuit open or shorted
OR
42 Fuel pump relay control circuit
OR
42 Fuel level unit - no change over miles
OR
42 Z1 voltage missing when autoshutdown circuit energized (The Z1 voltage is the voltage of the circuits fed by the autoshutdown relay. This typically includes fuel pump and switched-battery feed to the ignition coil)

rickybarth

anyone i really need help

Eva

Hmm... I can give you basics to recheck for a generic fuel pump, based upon the code info you listed. I have good working knowledge, but not expert in all things Jeep, like some of the people here. But here is a place to start.

Recheck your wiring:
Are your wires attached as per instructions? More importantly, has anyone else been there before you and changed the wiring colors in your vehicle?

Make sure all wires are secured well at least, check continuity would be better, especially your ground wire and contacts.

Did you test the fuel pump out of the tank or off frame? Does it run out of your vehicle? If so, the problem may be in your vehicle. If not, it's either miswired or it's defective.

Eva

One more thing.... did you have a code before the fuel pump renewal? Did you confirm the wiring circuit to the fuel pump was good before the renewal? Or did you assume the fuel pump was the problem?

(Sorry for the obvious questions, but I had a client who burned up a starter when he told me his truck wouldn't start, and failed to tell me it was out of gas..... )

rickybarth

well what happen is the part where the fuel line clips onto was cracked and leaked like crazy so i replaced it with a whole module. so alls i had to do is unplug the old one and put the new one on..could me not putting the lock ring on tight enough cause the pressure not hlding or should i get a new one. so i didnt touch the wiring also my checkvalve was bad so i needed a pump oh and it runs but it dosent hold pressure and it primes when you turn the key

rickybarth

oh also the oem pump had a single spring in the middle of the assembly and the new one has 3

Eva

Is there a fuel filter in front of it? You might need to bleed air from the lines.

Because your code info is all electrical related, I'm not sure where else to tell you to look right now without looking at it. Maybe someone else would have a suggestion.

rickybarth

i don't think there's a filter in-front of it.do you know if theres a trick to putting the seal on that goes around the pump and an easy way to put the lock ring on..

Willys55

You will pull your hair out if you use blink codes to diag your problem. If you can get someone to plug a scanner in and get the obd2 codes that will at least point you towards the electrical issue, as far as loosing prime well it could very well be a defective fuel pump module, the silver disc on top of the module is the fuel pressure regulator and check valve all in one.

rickybarth

well ill let you guys know what happens im getting a new pump...is there a trick to putting it in the tank with that gasket and lock ring it was a major pita

Willys55

put silicone grease on the gasket(both sides) Have a helper gently hold the pump in the tank so that you can use both hands to tighten the flange ring. The slower and more steady you turn the better. That plastic lock ring is the biggest pia

rickybarth

well got a new pump put it in and it works great..the motor only turns about half a turn and it fires right up i love it no more leaky check valve

ol"blue

Glad you got it fixed.

Eva

Excellent!