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Old Yesterday, 08:44 PM   #1 (permalink)
Diesel_Suburban
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6.5 Skips After Non-Use 1 Day Then Fine

This Chump is Stumped. Interested in opinions.


1997 Suburban K1500 310K miles original engine and transmission.
New fuel injection pump.
Recent injectors.
PMD replaced.
Recent fuel filter.
Fuel fresh and from good source.



After sitting for a day or two truck will start up just fine runs as it should. While still warming up, back out of driveway and start accelerating out of neighborhood up a hill. Truck cuts out intermittently otherwise runs fine. By time I get to the next traffic light no symptoms at all. Can drive down interstate, next several hours, start stop nothing. Purrs like a kitten. Only misses after a start and setting for a day of inactivity.


I hear the lift pump click as you would expect when turning ignition on. Perhaps clicking does not necessarily indicate fuel is being pumped?


Thanks in advance for help.

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1997 Suburban K1500 6.5L 310K miles

Last edited by OkDually; Yesterday at 09:10 PM. Reason: sig
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Old Yesterday, 09:02 PM   #2 (permalink)
OkDually
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I would install a piece of clear line on the return side of the IP to help locate any air in fuel gremlins.
If you notice any air in the line then you need to start hunting for the source of the leak.
https://www.dieselplace.com/forum/63...ml#post7305306

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1996 K3500 6.5L,( "F" Eng #141 cast block) 5 speed manual, crewcab, dually longbed: 208,000mi.
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Old Yesterday, 09:46 PM   #3 (permalink)
crankme69
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A few things I have had issues with on fuel supply...
-check valve on lift pump discharge built into (LP) not holding---might cause air intrusion
-fuel line that feeds the LP suction from the tank has leak---cause air intrusion
-fuel filter canister has slight leak that hides in the engine valley--more likely to cause fuel leak
-fuel flow is restricted during heavy engine loading (inner fuel tank sock restriction)---more likely to cause sputter hiccup under heavy throttle
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1995 1500 Silverado 6.5TD 2WD Ext Cab 246K, FSD cooler bumper mount, Buddy 3 pos chip, DE 4" exhaust, K47 with F intake

1995 Tahoe 6.5TD 222K Buddy chipped cat & muff delete

1994 1500 Silverado 6.5TD 2WD RCLB 240K Buddy chip F intake, daily work commuter 20mpg avg

2005 FLHTC 107 Twin Cam Tman 625 cams, 10.1 CR, Mik 45, DTT map, 3.37 final, E1 clutch & VPC with SE 6 sp, SnS roller rockers Bub 7 2 into 1 exhaust, 120Tq & 120Hp

1995 FXD 80 EVO V Thunder 2015 cam, Mikuni 42, SE slip ons, 80Tq & 70Hp

Last edited by crankme69; Yesterday at 09:55 PM.
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Old Today, 07:33 PM   #4 (permalink)
Diesel_Suburban
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Thank-you

Great feedback thank-you! Do you know if the sock in tank can be accessed without dropping the tank? Truck is 22 years old and as diesel goes in a tank there might be alot of snot in the bottom potentially clogging the pick up. Not sure how long this truck will continue to go but I care for it and it certainly has served the family. Thanks again. I will post when I come to a resolution.
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Old Today, 08:01 PM   #5 (permalink)
OkDually
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Quote:
Originally Posted by Diesel_Suburban View Post
Great feedback thank-you! Do you know if the sock in tank can be accessed without dropping the tank? Truck is 22 years old and as diesel goes in a tank there might be alot of snot in the bottom potentially clogging the pick up. Not sure how long this truck will continue to go but I care for it and it certainly has served the family. Thanks again. I will post when I come to a resolution.
The only other way to access the tank in a Suburban is to cut an access panel into the floor of the body.
Otherwise, you are stuck dropping the tank.
One way to test the sock is to disconnect the fuel line at the lift pump and blow compressed air through the line towards the tank.
The air should dislodge any contaminants off the sock and allow fuel to flow for a test run.
After reassembly, take it for a drive and see if it improves
__________________
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; Today at 08:03 PM.
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Old Today, 08:25 PM   #6 (permalink)
crankme69
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This is also something I have done with limited success...use existing or buy another Lift Pump (LP). You will need about 6 foot of rubber fuel line.

Disconnect the normal LP suction line (S1), use caution fuel may escape, be ready to plug off line just like if you were preparing to change out the LP.

Run temporary fuel line down the filler neck of the fuel tank, hook up LP suction to the temporary line and hook up LP discharge to S1 normal LP suction line tank side of the OEM lift pump suction.

Supply 12V to the temporary LP and viola fuel will now flow backwards into the tank and back-flush the snot off the tank sock. More effective than blowing air IME.

HTH's
__________________
1995 1500 Silverado 6.5TD 2WD Ext Cab 246K, FSD cooler bumper mount, Buddy 3 pos chip, DE 4" exhaust, K47 with F intake

1995 Tahoe 6.5TD 222K Buddy chipped cat & muff delete

1994 1500 Silverado 6.5TD 2WD RCLB 240K Buddy chip F intake, daily work commuter 20mpg avg

2005 FLHTC 107 Twin Cam Tman 625 cams, 10.1 CR, Mik 45, DTT map, 3.37 final, E1 clutch & VPC with SE 6 sp, SnS roller rockers Bub 7 2 into 1 exhaust, 120Tq & 120Hp

1995 FXD 80 EVO V Thunder 2015 cam, Mikuni 42, SE slip ons, 80Tq & 70Hp

Last edited by crankme69; Today at 08:47 PM.
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