Learned something new!

[byrdman1312]

Brought home a HMMWV on Monday. Unloaded and drove it to town, about 10 miles. While unloading it, I started it 4 or 5 times, no problems.
When I drove it to town, I stopped it for about 30min. and it would not start. I couldn't figure it out. I'm kinda new to these vehicles, so I called a friend who is a mechanic in the Army National Guard. When he arrived I explained what happened. Without saying much he opened the hood and poured a bottle of water on top of the engine, on the fuel pump. "Try it now!" It fired right up!
He explained that sometimes the fuel pump gets hot and causes it to not start. As long as you don't shut it off you're ok. He also said that the 4 or 5 times I started it at the shop it didn't run long enough to get hot. He said that they had one at the maint. company that they keep a case of water in the back for just that reason.
Most of you may already know this "trick", but I thought it was too good not to share.

 

[Recovry4x4]

I know it to be true with a DS-4 injection pump. Are any of the HMMWVs running DS-4s? I thought they were all DB-2s.

 

[gungearz]

So it's like a heat lock on a starter but on a injector pump.... classic cars without a heat shield on the starter are prone to do this after about a half hour of driving also.....

 

[dilvoy]

Time for a new injector pump!

 

[cpf240]

I thought it was just the fuel shutoff solenoid on the IP that is the problem, not the pump itself...

 

[Warthog]

The DB2 "hot" fuel shutoff issue has been around for awhile. The HMMWVs have a bad heat problem. Not so much on the CUCVs.

The coil inside on the pump housing is the issue.

I've heard of soldiers having to releave themselves on the pump because they didn't have a bottle of liquid handy.

 

[Chief_919]

I thought it was just the fuel shutoff solenoid on the IP that is the problem, not the pump itself...

It is actually the pump itself, that is a sign the head is worn. I have replaced the solenoids on ones doing it and it doesn't fix it.

Dilvoy is correct, time for a new pump, it is a sure sign yours is on the way out.

 

[TedG]

Make sure you use a fuel lubricating additive for the ip and the new low sulfur diesel...especially when you install your new ip!