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6.5L Diesel Engine Discuss the 6.5 GM diesel engine & associated components. Automatic transmission questions & problems belong in the 4L80/85 - 4L60E - 6L90 Transmission Forum

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Old 09-17-2015, 01:54 AM   #1 (permalink)
Brock 7654
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Serging/hesitation

I have a 94 gmc k2500 6.5 TD series f and when it idles it serves/bucks and then if I accelerate it hesitates like it's not getting enough fuel I have replaced the apps sensor and the pmd an relocated it to the front bumper and have put a new fuel an air filter on it and still does it but it I accelerate at a slow rate it doesn't do it what else could be wrong with it one of the local shops said it acted like it had a plunger stuck on the injector pump so he said to put a lil 2 stoke oil in the fuel and see what happens any ideas

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Old 09-17-2015, 06:20 AM   #2 (permalink)
callie454
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to the DP!!

I'm moving your thread to the 6.5 section. The guys over there will definitely be able to help you out.

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Old 09-17-2015, 07:54 AM   #3 (permalink)
Dahead76
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I had the same problem with my 95 when I first bought it. I had two issues I found. First the lift pump wasn't working. Previous owner wired in a relay for the oil pressure sending unit and wired it in wrong. Check and make sure ur lift pump is working. Second was the o-ring for the fuel heater on the filter housing was bad, leaking fuel and causing it to suck air. I put 2 stroke oil in my tank every time I fill up.
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Old 09-17-2015, 09:22 AM   #4 (permalink)
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First off check All Grounds using this thread for reference:https://www.dieselplace.com/forum/63-...d-grounds.html

Lift Pump Test & OPS Diagnostics check this thread here:Reference Material: Lift Pump/OPS - Diesel Place : Chevrolet and GMC Diesel Truck Forums

Pictures showing how to jump the Lift Pump on a 1992-94 6.5L https://www.dieselplace.com/forum/63-...ml#post6784033

Inspect and clean the FFM screen manager using this thread:https://www.dieselplace.com/forum/63-...ml#post7520401
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Old 09-17-2015, 10:44 AM   #5 (permalink)
truepower
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agree with ok,

lift pump, fuel leak/air in fuel and grounds, start with that and some 2 stroke oil or the stanydyne performance additive
Amazon.com: STANADYNE DIESEL PERFORMANCE FORMULA - 64 OZ.: Automotive Amazon.com: STANADYNE DIESEL PERFORMANCE FORMULA - 64 OZ.: Automotive

and let us know what you find
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1995 GMC K1500 6.5L
HIT 500,000km (310,685 mile) on 09/24/15, in the family since new, on the 3rd body job
PMD relocated inside the cab,glow plug override, high idle switch, OPS relay mod, all intake mods, fed the beast, new timing chain, balancer and used front cover, new injectors and origanal inj pump ... rebuilt 4l80E, 14 bolt diff with auburn locker with 6 bolt shaftsin rear, new bearings in front end, waiting on parts for new lift pump...
thinking of TCC lock-up mod and high flow water pump... just dont want to blow him up
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Old 09-17-2015, 12:19 PM   #6 (permalink)
Brock 7654
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Ok since I put in the 2 stroke oil it hasn't hesitated going down the road it only surges now when I'm at a stop or in park and it's starting to have a rough/slow start up with a puff of white smoke when I first start it in the morning
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Old 09-17-2015, 12:35 PM   #7 (permalink)
Brock 7654
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The lift pump works properly
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Old 09-17-2015, 01:30 PM   #8 (permalink)
Tommygunner
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May be getting air in the fuel system. Go to the FAQ sticky at the top of the forum scroll down page till you come to the air in fuel section. You also should read Newbies sticky. lots of needed info in both threads.
Welcome to the forum.
Is your check engine light on? have you checked for Trouble Codes?
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Last edited by Tommygunner; 09-17-2015 at 01:36 PM.
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Old 09-17-2015, 01:46 PM   #9 (permalink)
Brock 7654
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No check engine light no servies throttle light now water in fuel light nothing no codes the lift pump works the grounds are all good clean and attached well the ffm is clean it's making me mad because I'm a diesel mechanic and checked everything and nothing seems to be wrong lol
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Old 09-17-2015, 02:04 PM   #10 (permalink)
truepower
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what's the air filter like? still sounds like air in the fuel or restricted fuel. no fuel leaks? have you checked the inlet screen on the IP to see is it is clogged? you lift pump works but is it putting out enough volume?

also double check your vacuum system for leaks.

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1995 GMC K1500 6.5L
HIT 500,000km (310,685 mile) on 09/24/15, in the family since new, on the 3rd body job
PMD relocated inside the cab,glow plug override, high idle switch, OPS relay mod, all intake mods, fed the beast, new timing chain, balancer and used front cover, new injectors and origanal inj pump ... rebuilt 4l80E, 14 bolt diff with auburn locker with 6 bolt shaftsin rear, new bearings in front end, waiting on parts for new lift pump...
thinking of TCC lock-up mod and high flow water pump... just dont want to blow him up
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