Question: 85 k2500 fuel system issues(Surging) - Diesel Place : Chevrolet and GMC Diesel Truck Forums
 
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Old 11-06-2019, 10:07 PM   #1 (permalink)
suburbangreaser
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85 k2500 fuel system issues(Surging)

Greetings all,

So my truck was running a bit rough. Hard starts when it was hot, and sat for over an hour. It would have to crank a bunch but would fire up. I figured maybe fuel filter needed replacing. This past Sunday i started the truck no problem. Put it in gear and drove 2blocks, and the motor surged (high rpm) then cut out and died.

I got it to start, drove back, replaced fuel filter, and it ran fine for about 40-50 miles. I got in the truck this morning, and drove a block. It did the same thing, high rev, and died.

I have bleed the system, check all the connections. It starts up super easy, and nice. But once under a load it does the same thing. In park the throttle response is great revs up nice and even, but once down to idle rpm it will surge. Not in any consistent pattern. Some times fast, some time long n slow. Then it evens out, and seems fine.

So I'm hoping someone can shed light. I see no visible fuel leaks, no tell tale smells of fuel leak.

I noticed since replacing fuel filter the idle is higher that it was.

Help!

Thank you, and appreciate your help

Michael

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Last edited by OkDually; 11-06-2019 at 10:11 PM. Reason: prefix
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Old 11-06-2019, 11:03 PM   #2 (permalink)
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Fyi, I had a crack in my hard line from lift pump to Ip this past May. I replaced the lift pump when fixing cracked line.

The only thing I have not replaced in the fuel system in the past 10years is the fuel tank sending unit. I inspected the rubber lines to fuel take, and they are dry.

Thanks

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Old 11-06-2019, 11:59 PM   #3 (permalink)
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You have the original fuel filter? These have a tendency to leak air at the seals. I've also gotten crap fuel pumps out of the box.
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Old 11-07-2019, 12:07 AM   #4 (permalink)
suburbangreaser
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It's an aftermarket spin on Racor filter. It's dry all the around.

Yeah I've gotten bad lift pumps too. But it's not leaking or seems to be leaking.

Thanks for the reply
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Old 11-07-2019, 12:09 AM   #5 (permalink)
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Also I was out of town for a month, and when I returned the truck wouldn't start. I nearly drained the battery before it fired up roughly. But then it was fine. That was mid September
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Old 11-07-2019, 02:07 PM   #6 (permalink)
suburbangreaser
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Could the oxygen sensor be the problem?
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Old 11-07-2019, 02:26 PM   #7 (permalink)
suburbangreaser
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Something else I noticed when I replaced the fuel filter. The old filter was only 1/3 full of fuel.
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Old 11-07-2019, 02:38 PM   #8 (permalink)
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Quote:
Originally Posted by suburbangreaser View Post
Could the oxygen sensor be the problem?
A plugged cat can cause performance issues
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Old 11-07-2019, 02:41 PM   #9 (permalink)
suburbangreaser
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Thnx Dually. Where is it located? But would it cause a surge(dieseling) under load then engine cut off.
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Old 11-07-2019, 02:56 PM   #10 (permalink)
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Quote:
Originally Posted by suburbangreaser View Post
Thnx Dually. Where is it located? But would it cause a surge(dieseling) under load then engine cut off.
It will look similar to this pic and should be located just aft of the downpipe.

If it is restricted you will get no start conditions, surging and lack of power symptoms

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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

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