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I'm not positive that is necessarily true. Pressure can be lost without introducing large amounts of air.

What's the known condition of the IP?

Those look good. This is what I used. http://www.fs2500filter.com/?gad_source=1&gclid=CjwKCAjwwLO_BhB2EiwAx2e-34HehvH5oG1z6KhQpEt7qvdULum1hciJ9u9MsPjEnSC1_6OA_uz0exoC6dsQAvD_BwE

I would change that to run off the glow plugs and OPS Either 2 relays or 1 relay and a diode

Add a bypass filter. Make that engine last forever. I prefer the FS2500

I'd rather see anybody pick it up and do all that But then I'd like to see somebody clean out my spare parts.

That's kind of different. Maybe it has to do with backfeed from using one relay for both the prime feature/ glow plugs & the OPS. I used a separate relay for each. And just tied the outgoing power wires together. I don't know how to go about tying the diode in.

He's trying to maintain the safety factor of the oil pressure switch/OPS. IF IN AN ACCIDENT, wired hot, the pump will keep running until power is killed or the battery dies. If there's a leak it'll empty the tank. I triggered from.the glow plugs, the toggle switch and the ops.

I wouldn't try matching the 1995. I'd just wire the 93 by the numbers. Can you repair the hacked wiring and make it plug and play like Leroy's? I also install a toggle switch to run the lift pump in demand while changing the fuel filter or doing diagnostics. I avoid cutting and splicing as...

I mounted mine right by the drivers side battery The other bonus of adding the relays is, it saves the headlight switches on vehicles that don't already have a headlight relay.

The pressure leak down has to be addressed. Also run about 1/2 gallon of fuel outlet T drain and note the flow and fuel quality. - I do this about every time I work on something. It only takes a minute. And keeps the water trap cleared out.

I bought plug and play headlight relay upgrades so all 4 bulbs came on with the brights. They aren't terribly hard to make. Whoever made my last one found a connector for the headlights - no cutting or splicing. Plug and play. I might have got them off the GMT400 forum. @Glagulator...

New This refers to the lift pump check valve

Does your fuel pressure show 5 lbs immediately when you turn.the key to on? Or does it take a second for the fuel pressure to come up.? Maybe others could comment on any leak down you're having. Seems to me the gauge should read 5 psi almost instantly when you turn the key to run.

Does your fuel pressure obligations to 5 lbs when you turn.the key? Or does it take a second for the fuel pressure to come up.?

On a quick search. Mine were similiar to these. Not much slop...

I've never had long shaft burrs. Do you have a link? I've used extension with 2 set screws to hold the burr bits.

DS4 will have a PMD. Pump Mounted Driver which may not be on the pump anymore. It may be on any heating, elsewhere to stay cool. Search PMD here On this site for pictures.

Close to my home https://www.govplanet.com/jsp/s/item/13188732?kwtag=p13n-SE&h=

What does the fuel pressure read with key on, while the glow plugs cycle? Did you install a lift pump relay upgrade with the prime feature, so the lift pump runs with the glow plugs? If you have fuel pressure with the truck running. Your fuel pressure sending unit is working.