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Dunno, If the IP is messed up, I don't think there is anything you can do to screw it up worse. Taking the head off might be a good idea depending on your mechanical skills. There are several threads about the IP overhaul.

Good luck!

You will have to get something like "bio blast" or any other algicide. I got mine through the International Truck supplier here in Tampa. The stuff is very potent and you need gloves, etc while pouring it in the tank. Sure to cure any fungus growing in the system from the old diesel. I have run...

Yea, when it's that bad, you might as well take everything apart and clean. Fuel filters after that. if you have algae ( and you probably will) you will need to treat the system as cleaning will not clean it all out. It will upset you to have the engine stalling at power due to the filters...

Sorry, I'm in Land O' Lakes. It is nothing odd to see some of these fuel tanks rusty and full of algae. Lift pumps are expensive so try and save the old one if you can.

I was wrong. The small line you have circled is the vent line....****. The large line at the front of the tank is the return line. Surprisingly enough, I got a call Sunday to help someone with a fuel tank problem on a M109A3. Needed the lift pump. Lot's of rotten diesel but we got him going. The...

The small line that is pinched/broken off is the fuel return line from the IP/ injectors. It goes to that hole in the tank. It's missing the 90 degree flare. The large line is from the lift pump to the IP..... When you turn on the "ignition" the lift pump should start and followed closely by...