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Lift pump was fairly new, but an aftermarket. The IP timing was set with a Snap On scanner. I’ve just installed an AC Delco lift pump, the one for a ‘93. Also swapped out fuel filter, which wasn’t terribly old, but it didn’t look great, and had fine metal particles in it. It may be running...

No way I can afford a newer truck, and I have a particular soft spot for the one I have. I’ve also just completed a full, bare metal body restoration on this one. Getting it to run right is the only option.

Agreed 100%. I really can’t go any farther down the diagnostic path without knowing these numbers, and I’ve never been an advocate of blindly throwing parts at a problem, hoping something will work. No, I do not have a boost fooler or any other modification other than the PMD in the grill and...

I stated in this thread already that I can’t move the actuator rod at idle, and good vacuum present. Again, this is why I’m having trouble diagnosing this problem. A Cummins is starting to look good.

I can hear the turbo whistle as normal. Air filter is not pristine, but probably has less than 20,000 miles on it. Wastegate lever moves freely. I can’t move it by hand when the truck is idling. No black smoke when accelerating hard. Approximately 20” of vacuum at actuator at idle.

I do not have a boost gauge on it yet. I have the gauges for boost, EGT and trans temp, just haven’t had time to install yet. I have Tygon line installed at the IP return and injector return lines. No bubbles. I did mention P0236. That part of what’s baffling. Feels like no boost, but there’s...

It was a reman IP from Autozone. I’m honestly suspicious of the quality of it. IP timing and TDC offset were set iblsing a Snap On Ethos.

My truck is way down on power. It really feels like it does when there's no boost. No odd smoke of any kind. Relatively new IP, Bosch injectors and lift pump, and boost control solenoid. Threw P0236 code, yet I have 20' of vacuum at idle at the wastegate actuator. What am I missing?

It’s fixed. Runs better than ever, with the new injectors and IP. The problem was in the sender. I went with the Dorman unit, pitched the sock in the trash, and used an AC Delco lock ring and gasket. The gas gauge doesn’t wiggle around too much, so the Dorman sender may be superior to the...

New parts arrive tomorrow, the bed is lifted, old sender out. Pretty sure the leak was in the sender supply line, before it turns into the tank. Looking for opinions here. I had the experience of one AC/Delco filter sock collapsing. after that, I installed an external, spin on pre filter setup...

What does anyone think of getting rid of the original rubber lines, removing the flare fittings off of the sender, and just installing plain ol’ fuel line with worm drive clamps?

Hooked a Jerry can of diesel up to the lift pump, bled the FFM and IP, started the truck up. After about 60 seconds of running, the bubbles cleared out of the return line. Finally some real, diagnostic progress. Most of my automotive career I’ve worked on Italian and German cars. A diesel...

The entire topic of “lift pumps don’t provide suction” is now immediately clear. Duh.

Great suggestion to plumb the LP into a Jerry can of fuel. @dbrannon79 why is there a concern as far as having the container of fuel above the level of the lift pump?

Swapped out the lift pump for what I believe to be a known, working unit. Bled the FFM and the injection pump, got the truck started. Tons of bubbles in the return line. Truck faltered and stalled. With the lift pump relay jumped, I got 4 psi at the tee. I can’t a good steady stream of fuel out...

I do I did not detach the hoses from the sender when I removed to from the tank. O-rings on the lift pump fittings? I admit that I missed that, though I’ve just now seen a pic of it on another forum. I’ll be checking for that today. I have a lift pump that functioned just fine for lots of...

Warning, this is going to be long, but I think the chronology of events is important. I have owned my ‘98 K2500 for fifteen years. Aside from one PMD failure (long ago relocated), and a couple of lift pumps, it’s been the paragon of reliability. My background, ASE Máster Tech, 40 years. This...