77 Wagoneer Fuel Pump Issues?

skuzzyg · 06-06-2009, 12:24 AM

Hey all,

I bought a 77 Wagoneer... "aka" The Beater Truck.

I was told that the owner before me replaced the Fuel Pump.
I start driving it and find that every once and a while the Jeep would just die at random times. After dealing with the issue for about 2 months my friend and I replaced the Fuel Pump. No more problems.... Now, only 8 months later, all the same issues come back. I replace the fuel pump again. And the issue goes away.

Does anyone know if this fuel pump issue is common in the 77 wagon? Or is there something else I should check out on it?

Thanks alot!

**BJ's Off-Road** · 06-06-2009, 12:41 AM

How random? Is your fuel tank at 1/4 when this happens, are you going downhill and stabbing the brakes possibly?

skuzzyg · 06-06-2009, 10:42 AM

yah it is completely random when it happens. It could have a full tank, or half tank... It has happened on a flat road, and going downhill. I have had it when I was just sitting at a stop light, then all of a sudden, it goes dead.

**BJ's Off-Road** · 06-06-2009, 10:44 AM

How hot is it outside when it happens? Sounds somewhat like vapor lock to me.

**BitterGabe** · 06-06-2009, 07:36 PM

Does the stall happen during hot weather or when the motor temp is up? I had the same issue a bout a month-or-so ago with my 90 Grand Wagoneer (360 v8).
Everything was OK during cooler weather and for about 15 minutes after start during hotter days. After that, I would get random stalls too.
My issue was vapor lock.
I had smaller jets put in the carb (i'm at high altitude) and my fan clutch was not kicking in when i was supposed too. I had it replaced with a heavy duty one.

Look at the fuel you use too. High levels of alcohol added to the gas can cause vapor lock too; especially when the motor is hot.
cheers

iagmc · 06-09-2009, 05:05 PM

how often to you change the filter? and how clean is the tank? a rock of dirt could plug the line, when the vacum drops so does the rock of dirt allowing it to start again.

carnuck · 07-02-2009, 04:07 AM

Add a filter before the pump. Also check the connector for the dist. The Prestolite ignition (gold box) has a habit of suddenly dying due to corrosion there. I had trouble with the fuel sock in the tank collapsing due to fuel additives (MTBE was the worst!) turning it to mush.

06-06-2009, 10:42 AM	#3
skuzzyg Registered User Join Date: Jun 2009 Location: Great Falls, MT Posts: 2 Profile Gallery Classifieds My Jeeps	yah it is completely random when it happens. It could have a full tank, or half tank... It has happened on a flat road, and going downhill. I have had it when I was just sitting at a stop light, then all of a sudden, it goes dead.