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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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  • 1 Post By OkDually
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Old 10-14-2017, 07:59 PM   #1 (permalink)
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1995 GMC K3500 4X4 Dually 6.5 Diesel

Well Guys I guess I didn't have enough yet with these 6.5 Diesel.Well anyways I bought this truck for 5,000.00 dollars it only has 68,300 miles. As You guessed it set ALOT....But it fired up sounds great. Put fresh fuel and treatment in.changed oil and moved the PMD.It runs ok at idle, but going down the highway and you step on the throttle it Surges and won't quit till you leave off and then it straightens out... Any Suggestions..Oh I changed fuel filter Also, I took the fuel out of where the filter goes and Dumbed Power Serivice in the filter housing. I'm in the proscess of doing it again tonight.. trying to clean the eye sensor out in fuel pump. I found out the Guy that had it dumbed Sea Foam in the tank. And from Experince with my other truck I found 6.5 Diesels don't like it...Well any feed back I will be VERY THANK FUL...

6.5L Diesel GMC. K2500.4X4
1995 GMC K3500 6.5L Dually

2005 Chevy 2500hd Duramax
fuel rail fitting that has bigger Hole
PVC Delete, 5 in exhaust
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Old 10-14-2017, 08:32 PM   #2 (permalink)
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Remove the FFM, clean and then replace the 2 O-Rings.
Replace the screen filter down inside of the bottom

With the engine running, open the T Valve for 30 seconds and let fuel drain into a container.
If during that time, the engine dies or no fuel flows from the drain line then replace the lift pump.

Install a clear line on the return side of the IP to help look for air in fuel.

Do not mess with the Optical Sensor.. It is a sensitive part of the IP and deals with your timing.
There is a set procedure to deal with the OS and if not followed you will turn your IP into a very expensive paperweight.
Sea Foam is ok to use in a 6.5L, in limited quantities..

1996 K3500 6.5L,( "F" Eng #141 cast block) 5 speed manual, crewcab, dually longbed: 208,000mi.
Diamond Eye 4" Turbo Back Exhaust w/2.5" Flo-Pro Crossover
AirDog II DF165 w/ tank sock delete - XDP
TD-Max boost controller - Kennedy Diesel
OPS extension hose - Leroy Diesel
Glow Plug Harness- PT Wiring Solutions
Glowshift Maxtow EGT,Boost, Fuel gauges
Boost & Fuel Pressure Bolts - Leroy Diesel
2/0 Battery Cable Upgrade - PT Wiring Solutions
PMD w/#9 resistor and Re-Location Kit, mounted to bumper - Leroy Diesel
GM-5 Turbocharger
4.10 gear ratio
OptiLube Winter Formula

Proud member #1039 of The 3500 Dually Club

Last edited by OkDually; 10-14-2017 at 08:33 PM.
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Old 10-14-2017, 09:12 PM   #3 (permalink)
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Have you tried running with the fuel cap loose. A plugged vent in the fuel cap or cap for a gasser can cause a vacuum to form in the tank and starve it for fuel.
91 K2500LD reg cab 6.2 4L60 deceased at 310k
92 k2500hd 6.5 4L80E std cab died of frame cancer285 k
4- 93 k2500hd 6.5 2-4L80E 2-NV4500 2-ex-cab 2 std
94 K2500HD 6.5td 4L80E new reman engine
94 K2500HD 6.5td NV4500 Std cab LB
2-94 K1500 Ex cab 6.5TD 4L80E 1-LB parts truck 1-SB
94 k25000 Suburban 6.5td 4l80E
95 tahoe 2 dr 6.5 4L80E needs HG or engine
95 k2500LD 6.5 4L80E std cab bad trans
95 k2500hd 6.5 4L80E ex-cab
2-95 K2500 Suburban 6.5TD 4L80E both need engines
97 k2500hd 6.5 4L80E std cab
97 k3500 C&C 6.5 4L80E std cab needs engine
98 k2500 hd 6.5 4L80E std cab bad trans
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