HHMWV Fuel tank leak

[Ajax MD]

Looks like 1 and 5
But not sure that is the correct drawing, what model truck?

It's an early M998 that has been re-engined with the 6.5l but kept the 3-speed TH400. To my eyes, the fuel tank is original. The truck has the driveshaft parking brake which means the tank is the early style.

 

[Mogman]

It's an early M998 that has been re-engined with the 6.5l but kept the 3-speed TH400. To my eyes, the fuel tank is original. The truck has the driveshaft parking brake which means the tank is the early style.

Then that would be correct, 1 and 5

 

[TNDRIVER]

I could use some assistance interpreting this parts drawing.

Basically, I want to purchase the two metal fuel lines coming directly from the fuel tank. These connect to rubber sections a little further upstream which then possibly turn into metal sections again if I interpret the diagram correctly. The exploded diagram doesn't show the fuel tank at all, it's kind of a disembodied view.

Which numbers do I need?

View attachment 889327

If you have a hydraulic line shop near, you can carry those in and they can replicate them easily. Just saying.

 

[Ajax MD]

If you have a hydraulic line shop near, you can carry those in and they can replicate them easily. Just saying.

Hm, I do have a Colliflower shop that does this. Good point.

 

[Ajax MD]

Ok, tank is fully removed. I've removed the crushed section of metal fuel line. Hopefully I'll have the section made tomorrow.

I should expect to have to purge air from the fuel system after all of this? I've read the procedure and even found an old Army training video but I haven't actually done it yet.

 

[Coug]

it may or may not be an issue. There should still be fuel in the lines and filter, so you might find it fires right up with minimal cranking.
When I dropped and reinstalled my tank I don't remember doing anything special to get it running again.

If it does have issues, then yes, you'll need to do something to purge the air.

 

[Mullaney]

Ok, tank is fully removed. I've removed the crushed section of metal fuel line. Hopefully I'll have the section made tomorrow.

I should expect to have to purge air from the fuel system after all of this? I've read the procedure and even found an old Army training video but I haven't actually done it yet.

.
Air pressure (a rag at the filler nozzle tube and 3 to maybe 5 pounds of air) will help.
Cranking and if it will run - a high idle is a good plan too.
Otherwise the video will be your plan... Hope it goes easy.

 

[Ajax MD]

OK, I got 'er did.
NAPA had sections of steel line with the correct ferrule for $10. I used my handheld tube bender to give it contours similar to the factory tube.

Engine started with no purging or troubles. I appreciate all the advice.