Hello. New to the forum. I have a 94 K3500 6.5TD. Just had the fuel control module changed along with the lift pump. Now I have no acceleration. 70 MPH top speed. Any kind of load will slow considerably. Turbo seems to be working fine. Waste gate operates normally. Any help would be appreciated.
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94 K3500 no acceleration
- Thread starter kgreenlee
- Start date
ak diesel driver
6.5 driver
Did you change the OPS? Oil pressure sender
Previously changed the OPS several months ago. No to changing the oil pressure sending unit. everything seems to be working just no acceleration. Idle is fine. Drives fine.
ak diesel driver
6.5 driver
OPS is the oil pressure sender, there's contacts in it that run/control the lift pump
Will L.
Well-Known Member
Welcome to the forum, the reason ak is bringing up the lift pump is the truck will start and drive with no lift pump as it is flow on fail. The lack of pressure into the injector pump will cause the problem you are having.
Put a fuel pressure gauge in the line going into the injector pump so that you can read it while driving. Ensure that the gauge never goes into a vacuum. You need a gauge that reeds vacuum and fuel pressure in one. Like this one: http://www.summitracing.com/parts/lil-20300
When is the last time you replaced the fuel filter and screen in the FFM?
Put a fuel pressure gauge in the line going into the injector pump so that you can read it while driving. Ensure that the gauge never goes into a vacuum. You need a gauge that reeds vacuum and fuel pressure in one. Like this one: http://www.summitracing.com/parts/lil-20300
When is the last time you replaced the fuel filter and screen in the FFM?
jrsavoie
Recruit
On a 1994 do the dual lift pump relay upgrade. You will never have to replace another OPS. The relay upgrade almost always works forever with a bad OPS. as long as the OPS is putting out any juice at all it will trigger the relays.
Do not cut and splice any wires. Make it like Leroydiesel.com makes his as a plug and play unit or just buy his.
I prefer mountable relay sockets as opposed to mountable relays
Do not cut and splice any wires. Make it like Leroydiesel.com makes his as a plug and play unit or just buy his.
I prefer mountable relay sockets as opposed to mountable relays