Go Back  Diesel Bombers > Chevy/GMC Duramax > Chevy/GMC 6.2L and 6.5L
6.5 is acting like it's getting good fuel one minute n not another. >

6.5 is acting like it's getting good fuel one minute n not another.

Chevy/GMC 6.2L and 6.5L Discussion of Chevy and GMC Trucks with 6.2L and 6.5L Diesel Engines

6.5 is acting like it's getting good fuel one minute n not another.

Old 09-27-2018, 04:38 AM
Annmarre's Avatar
Thread Starter
Join Date: Sep 2018
Posts: 1
Likes: 0
Received 0 Likes on 0 Posts
Default 6.5 is acting like it's getting good fuel one minute n not another.

I have a 93 k3500 gmc 6.5. I drove it to my doc appointment and it ran fine. When I came out I started it and noticed by the sound it needed oil... no matter what I just can't get that under control.. ugh. All of a sudden it revved up then shut down. I tried restarting it but it wouldn't so I knew it had to be the oil. I walked over to the truck stop and got some, put it in the truck which it did need it and ever since then it's running as if it's bogging down then getting fuel. I can feel it as I'm driving it and it won't idle right anymore either. It has a new turbo as of 5 months ago and I always have a shop fix it. I just don't have the money for the shop anymore. Everytime I put it in there I'm charged over a grand and they lose bolts or don't tighten them or can't fix the problem without fixing other things first that wasn't the issue... and I've tried different shops. It's hard to find someone to work on my truck because it's extra heavy duty as it was a city work truck. This morn it started just fine, idled right then all of a sudden jumped around and shut down. Tried it again and the same thing happened.

Last edited by Annmarre; 09-27-2018 at 04:59 AM. Reason: Forgot to add year
Old 09-28-2018, 12:02 AM
Bigg Redd's Avatar
Diesel Bomber
Join Date: Oct 2010
Location: TEXAS
Posts: 2,384
Received 298 Likes on 287 Posts

PMD comes to mind..........
Old 02-10-2019, 08:44 AM
racer55's Avatar
Diesel Bomber
Join Date: Oct 2012
Location: Scugog Island ONT.
Posts: 1,848
Likes: 0
Received 103 Likes on 103 Posts

No PMD on a 93

I would look at getting the oil pressure switch replaced with an AC Delco ONLY!The OPS is what powers the lift pump on your truck.DO NOT use aftermarket OPS,they are usually bad right out of the box.
Then verify lift pump operation and repair/replace as required.
Then verify no leaks on the suction side of the fuel system including the sending unit-they have been known to rust through inside the tank and cause issues when the fuel level drops below the hole.

A quality vented fuel filler cap is also required and lastly make sure that the sending unit has a diesel fuel sock fitted-many aftermarket sending units come equipped with a gasoline sock/screen that has too fine a mesh for cold diesel to pass through efficiently.

Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.