ChevyMan1972 Posted September 26, 2006 Report Share Posted September 26, 2006 Please Help! We have a 1995 Chevy 3500 dully 6.5 Turbo Diesel, and we are stuck with a little problem. Truck starts rough and slow....and when driving for no reason it will shut off! You have to coast to a stop and turn the key off and re start it and it will run for about 10 more minutes and then to the same thing. I have read on the internet about this same problem and it seems to be fuel related can anyone help? We have changed fuel filters etc re primed system and we still get the same thing. Also the "water in fuel" light comes on. Can someone give me some ideas where to look, while dad is away on the road? Thanks, Daniel Weaver Quote Link to comment Share on other sites More sharing options...
Lustalbert Posted September 26, 2006 Report Share Posted September 26, 2006 I am not overly framiliar with the 6.5L fuel pumps, have you checked the wires that go to the fuel cut switch? Perhaps it is not making good contact, is starting to grow some corosion, or is getting oil on a contact. Quote Link to comment Share on other sites More sharing options...
RUTAN TA1647545492 Posted September 27, 2006 Report Share Posted September 27, 2006 I just checked a 99 at work with a p1216/p1217 that needed a injection pump. Quote Link to comment Share on other sites More sharing options...
AJ Posted September 27, 2006 Report Share Posted September 27, 2006 I just checked a 99 at work with a p1216/p1217 that needed a injection pump. what 6.5L doesn't need an injection pump? don't know if it helps you out or not but GM exteneded the warranty on those but i don't remember how far back it went to or the miles. Quote Link to comment Share on other sites More sharing options...
RUTAN TA1647545492 Posted September 28, 2006 Report Share Posted September 28, 2006 I am sure it doesnt go back to 95, but they did warranty LLY/LB7 injectors for 200,000 miles. Quote Link to comment Share on other sites More sharing options...
88lx5oh Posted October 8, 2006 Report Share Posted October 8, 2006 a guy at work has the same truck doing the same thing.. when you figure it out let me know Quote Link to comment Share on other sites More sharing options...
Guest Removed Posted October 8, 2006 Report Share Posted October 8, 2006 I just checked a 99 at work with a p1216/p1217 that needed a injection pump. i was about too say that..... the pumps in these are junk. most likely the issue here. even the early ones. Quote Link to comment Share on other sites More sharing options...
TEXASS Posted October 9, 2006 Report Share Posted October 9, 2006 buddy of mine had the same probliem and it was his injector pump and the pump was more than wut the truck was worth Quote Link to comment Share on other sites More sharing options...
desperado Posted October 9, 2006 Report Share Posted October 9, 2006 I don't know dick about the 6.5 but I know that some of the 6BT Cummins motors had a transfer pump in the tank and when it goes bad it acts like this. I would also check your inline tank valve for the dual tanks. I assume it has duals as most duallies did. That will also cause it to starve for fuel and not run right. If none of those things fix it,,, I would attempt to run a line off the input of the pump into a can of fuel, see how it acts. That will be a good indicator if it's the injection pump or the tank and delivery system. If it's the pump, I may be able to get the pump rebuilt at Columbus Diesel. I would NOT replace it with a new pump. Quote Link to comment Share on other sites More sharing options...
yardman10 Posted October 12, 2006 Report Share Posted October 12, 2006 Lift Pump DESCRIPTION The electric fuel lift pump mounts on the inside of the left frame rail, and is used to deliver fuel at a low pressure (at least 3 psi or 21 kPa) at the rate of 0.24 liter (1/2 pint) in 15 seconds (15 GPH). The lift pump is controlled by the lift pump electrical circuit. Lift Pump Electrical Circuit When the ignition switch is in the crank position, the fuel pump relay is energized which sends voltage to the lift pump. During this time, oil pressure is building to the point of closing the contacts of the oil pressure switch. A minimum of 28 kPa (4 psi) is required to close the switch contacts. When the ignition switch is returned to the "run" position, the oil pressure of the running engine maintains voltage to the lift pump. If engine oil pressure drops below 28 kPa (4 psi), the engine will run poorly or stall when the lift pump circuit opens. Quote Link to comment Share on other sites More sharing options...
yardman10 Posted October 13, 2006 Report Share Posted October 13, 2006 If the lift pump is not functioning correctly, and doesn't feed enough fuel to the injection pump, it can ultimately lead to injection pump failure because the injection pump is lubricated from the diesel fuel and no diesel fuel means no lubrication and being that it is a rotary pump, it will stop working. Quote Link to comment Share on other sites More sharing options...
slowdiesel Posted October 15, 2006 Report Share Posted October 15, 2006 There is a black box (PMD), on the injection pump. That is prob your problem. They go out all the time, They just get too much heat, and thats just too hard on the Electronics. Quote Link to comment Share on other sites More sharing options...
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