Need help with truck shutting off .

**Street Fighter** · 03-20-2009, 04:01 AM

I have a 93 Jimmy that my wife use to deliver mail out of.Lately it has started quitting when the weather is on the warm side,when it's cool it has no problem going the mail route.My wife have told me that as the truck runs the fuel pump gets louder, I can hear it while idling in the yard but it don't seem that bad. I have another pump that I could put on it but, I would like to get it right the frist time.What do you think. she said that it starts back up after about three to five minutes.I felt like it was the coil,but it only do it when it's warm out side.any help is good help to me.

**Orcus79** · 03-20-2009, 06:59 AM

It very well could be the fuel pump. If it's getting louder as it gets warmer, it's getting hot. as wild as it sounds when was the fuel filter last replaced?

**0rion** · 03-20-2009, 07:26 AM

get it warm and check the fuel pressure. Those fuel pumps on those trucks are loud anyhow. The one on my 97 sounds like another engine running back there.

Get it warm and check the pressure and if it's fine then you can check for spark and that should tell you quite a bit about what's going on.

**Y2KArcticSS** · 03-20-2009, 07:31 AM

My SS fuel pump did the same when it went out...that's how I limped it to my Dad's shop... I drove it til it started hesitating bad, pulled over, waited about 15 minutes, and finished the drive to the shop, barely made it....

my parents' 93 and 98 Jimmy's both did the same or similar, except the 98 was just a bad connector that would shut down when it got too hot.

**knappbunch** · 03-20-2009, 07:56 AM

yep my fuel pump would drop mad pressure when hot it has been replaced and car is back to normal.

**Street Fighter** · 03-20-2009, 05:31 PM

Originally Posted by Orcus79

It very well could be the fuel pump. If it's getting louder as it gets warmer, it's getting hot. as wild as it sounds when was the fuel filter last replaced?

The fuel pump was replaced about 7 months ago.Last year this time it was in need of the centerport setup, now it's who knows what.I will be changing the fuel pump and the coil both I already have.Thanks for the reply.

**Street Fighter** · 03-20-2009, 05:42 PM

Originally Posted by 0rion

get it warm and check the fuel pressure. Those fuel pumps on those trucks are loud anyhow. The one on my 97 sounds like another engine running back there.

Get it warm and check the pressure and if it's fine then you can check for spark and that should tell you quite a bit about what's going on.

I thought about that but my wife said that it be just about the last hour or so before it starts cutting off.,She goes about 55 miles aday dropping off mail so I don't know if I Can get it that hot.She is going from mailbox to box stopping and going, so the engine heats up kind of fast on a hot day.very little cruise speed.May just let it run in the yard and see what it does.don't want to out on the highway and have this to happen and it goes all the way out. Thanks for your reply.

**0rion** · 03-20-2009, 06:02 PM

another thing to check is the "spider" in the intake. I'm not sure on the 93's how they were set up. My 4.3 has the main fuel line that goes down into the upper intake and into the "spider" which then sends fuel to the injectors. Those and the regulator are famous for going out. You can look for a leak by shining a flashlight into the intake seeing if the walls are washed down with fuel.
Also, the distributor gears are known to wear down on those motors. I know I'm kinda all over the place but they have their share if issues.

Does your intake leak coolant? If not you're one of the .99999% that doesn't.

**0rion** · 03-20-2009, 06:04 PM

Originally Posted by Street Fighter

The fuel pump was replaced about 7 months ago.Last year this time it was in need of the centerport setup, now it's who knows what.I will be changing the fuel pump and the coil both I already have.Thanks for the reply.

sorry, I missed this post.