Welcome to DieselPlace,
1994- the lift pump relies on the OPS to power up the lift pump.
Change out your OPS and install the OPS relay mod listed in the FAQ section
You mentioned checking the sock filter. You also mentioned it was new.
When you replaced the tank sock did you install AC/Delco #TS 1012??
If not, you will need to replace that sock with the AC/Delco.
Aftermarket tank socks will not work in a 6.5L and will cause fuel restrictions.
When you open your fuel cap do you hear a large "Whoosh" sound?
If so then you need to modify the fuel cap for better venting.
As MrMarty51 mentioned, also try another "Known Working" PMD w/ resistor installed.
Go through all of your grounds.
Install a clear line on the return side of the IP to help look for air in fuel gremlins
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
4.10 gear ratio
OptiLube summer + Formula
Proud member #1039 of The 3500 Dually Club
Last edited by OkDually; 10-22-2017 at 09:47 PM.