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Ive talked with a lot of Marines lately at different times that drove and were assigned M37's in Vietnam. I asked about the vapor lock and all and what did you do in Vietnam...


They put electric fuel pumps on them is what all of them said.

Interesting about the use of electric fuel pumps in Vietnam. Was there ever a tech bulletin or something making these changes??

Guess I'll find out this summer . Think I'll try the mechanical one before I make changes. As I said I made a new heat shield and fuel lines are not in original place. Much further from exhaust manifold. We'll see how it goes

Ive had 2 M37's ,
One with no electric extra pump and one with one. The one without did vapor lock once, but only the one time , even in the NC heat of the day it drove fine. So I cant say they are 100% needed but I don't want to be on the side of the road.

I was told by some of them they used in line fuel 24v pumps , and others used pumps like a Marine(boat) 24v pump.

Thanks for the info