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1993 6.5 fuel issues

6

6.5stayinalive

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I did some trading a couple months ago for a 1993 Chevrolet 2500 6.5. My dad used to work with the guy that had it before me, and said that he didn't seem to know much about performing maintenance, and it's very obvious when you see it in person. The injectors and glow plugs are all but shot, the throw-out bearing rattles, smokes like a freight train, and it's hard cold starts remind me of an old IDI Ford, just to name a few things. I haven't done much but drive it occasionally, since I'm trying to sell it.

Yesterday, my dad and I took it up in the mountains to get a load of wood, and as I was backing up, it cut out and died, the first time it had ever done that. I was on top of a hill, so I tried coasting and dumping the clutch trying to get it to start, but it wouldn't fire. It turns over just fine, and if I take the fuel filter on top of the engine out and fill it with diesel, it will start up and run until it burns up whats in the fuel filter housing. Basically, it's not drawing fuel from the tank. My first thought would be a bad lift pump or OPS, but I ran my other '93 6.5 unknowingly with a bad OPS for over a year and a half, and 90% of the time it would run just fine. Do these things have in-tank pumps? If so, that's another possibility.

I'm holding the truck for a guy until next weekend, and I need it running by then. Any input would be greatly appreciated.
 
Any time you open the fuel system on these motors you will need to prime the fuel system.... the IP can pull fuel from the tank IF the IP is in good shape and there is no air in the system.

You should jump the LP with 12volts and crack a few injector lines and turn the motor over in short sessions to get fuel to the injectors. If the LP is bad, the pump will not pull fuel through it to be able to prime things. If the LP is not working, get a new 93 year model LP and start the priming prosses from the start and you should be able to get it running.... until everything is free of air, it won't run...
 
It IS an old IDI Ford!
Ford just got the DB2 Injection Pump rotation backwards!!! :hihi:

Air in the fuel system and bad glow plugs make hard starting. Air alone will do this. Sticking injectors also make hard starting. Possible blown head gasket? Fuel filters have a touchy gasket that may fail when pulled out -old style round filters.

The lift pump is really needed. just because one ran without doesn't mean it liked it. Low power and hard on IP transfer pump.

IMO you have a need for this truck. Couple grand put into it and you can have a hard pulling truck. (Injectors, glows, Walbro, A Team Turbo, clutch.)

MT trucks are popular on here so post it up on here if it falls through. Esp if the body is good - power train issues are an engine lift away from solved for some of us 6.5 nutcases. :rolleyes5:

You can check the lift pump, frame rail mounted, out here:

http://www.thetruckstop.us/forum/sh...t-Pumps-amp-OPS-operation-and-troubleshooting
 
Its your tank sock.
Inside the tank is a sock its on the pick up tube. Its fairly common that they plug up or if an aftermarket sending unit was installed it will have the wrong sock on it.
You can sometimes test this by blowing air back from LP to tank (tank cap removed). If that fixes the problem it will only be temporary as the crud will plug the sock again.
Look at my web site in the "fuel delivery" section, there are products like a LP pre filter set up and an LP bypass kit also the Walbro pumps.
GM should have made these trucks with an external filter in the first place, but a sock is so much cheaper.

www.leroydiesel.com
 
WarWagon said:
IMO you have a need for this truck. Couple grand put into it and you can have a hard pulling truck. (Injectors, glows, Walbro, A Team Turbo, clutch.)

MT trucks are popular on here so post it up on here if it falls through. Esp if the body is good - power train issues are an engine lift away from solved for some of us 6.5 nutcases. :rolleyes5:

You can check the lift pump, frame rail mounted, out here:

http://www.thetruckstop.us/forum/sh...t-Pumps-amp-OPS-operation-and-troubleshooting
Click to expand...

I threw around the idea of yanking the engine/tranny out and putting it in a mid 80's/90's crew cab dually as kind of a comfortable freeway hauler. It is a stable foundation, but I'm a college student, and I could use the money. Besides, I don't really have a need to have two of the same truck. Lol
 
Thanks for the input guys! Went up to Napa today and bought an OPS, LP, and tank sock. I'm up in SE Washington, and the truck is at my parents' house in NE Oregon, I'm headed there Friday to dig in!
 
The tank sock from Napa a Delco part? if not its not the right one. Actually I have not seen a GM/Delco replacment only aftermarket and they wont fit a stock pick up tube. Hate for you to get all the wat into that job and not have the right part.
 
post some more detailed pics of the rig, and maybe the craiglsit ad? I really think you need to keep the 5 speed and sell the auto, but my opinion is a tad biased. :)
 
Burning oil said:
The tank sock from Napa a Delco part? if not its not the right one. Actually I have not seen a GM/Delco replacment only aftermarket and they wont fit a stock pick up tube. Hate for you to get all the wat into that job and not have the right part.
Click to expand...

The sock is Delphi, everything else is Napa brand. Would that work?
 
Sock is not correct, I don't see the bypass valve in it.
I would return the sock and lift pump and get a Walbro that has it's own screen. Remove sock from tank and never put it back.

That is a nice looking truck. (Really, you should see my 1993. Least your paint matches...)

Upper left corner is the tank sock with round bypass valve. Also shown is a transfer flow tank sock and a Walbro screen all plugged with a diesel bug.

brown stuff.jpg
 
WarWagon said:
Sock is not correct, I don't see the bypass valve in it.
I would return the sock and lift pump and get a Walbro that has it's own screen. Remove sock from tank and never put it back.

That is a nice looking truck. (Really, you should see my 1993. Least your paint matches...)

Upper left corner is the tank sock with round bypass valve. Also shown is a transfer flow tank sock and a Walbro screen all plugged with a diesel bug.

View attachment 35790
Click to expand...

What about taking the old one off and cleaning it? It doesn't have to be perfect, I just want it to run decent when the guy comes to get it.

And thank you, I do like the truck, even with all the problems that it has. Between you and me, I only have a total of $900 invested in it.
 
Hey guys, I came home tonight and pulled it into the shop and crawled underneath (first time I'd ever been underneath it) and someone had put an aftermarket lift pump on it and spliced the wires together and hadnt even put tape on them. One of the wires was disconnected, and I twisted them together, poured some fuel in the fuel filte housing, turned it over and it started hard as always, but stayed running! I put some electrical tape over the splices so it would be a little more sturdy. Thanks for the info guys!
 
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