Not having emiss. or return line is not causing your issue. It has nothing to do with your pump or vapor lock in the lines. It is not your timming or lack of elec. fuel pump like a lot of ppl thought back in the day. Your fuel in the float bowl is vaporizing after you turn the truck off due to the exh. manifold being mated to the intake (great idea in the cold, SUCKS in warm weather) make sure your heat diverter flap is operating correctly (most are not, sends too much heat to the bottom of the intake) and make sure you have a good working stock or aftermarket carb fan. I also believe altitude and fuel quality may have a role in this issue.
What are your solutions for vapor lock?
- Thread starter FineWynsFJ40
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hmm.. makes sense.
But, I have no idea what a "heat diverter flap" is, or what/where a "carb fan" is? I've seen carb fan mentioned, but I assumed it had something to do with emissions/smog, and since my rig is pre-'73, I didn't think it applied to me.
I have a '71 FJ40 with SBC 327 and Edelbrock 4bl 1406 carb. Does this apply to my setup? Much thanks..
ps.. I've never had any vapor lock or fuel problems, and don't think I have too much of a serious problem with smelly gas fumes, but there is a gas smell in my garage when I park my rig there. Figure that's just part of the joys of owning these land cruisers!
The old solution for a vapor lock on an engine was to put a couple of wood clothespins on the steel fuel line between the carb and pump and a couple on the line between tank and pump. A pin up close to the carb will pull heat from the carb.
No Hijack intended, but a friend of mine does this and very seldom has the problem of fuel boiling out. I thought it was snake oil, but maybe this legend is true...
x2 on the wooden clothes pins. I once drove a '36 Ford Roadster cross country in the Great American Race, and had terrible vapor lock issues. At one of our stops, an 'ol timmer recommended that we install wooden clothes pins along the entire fuel line to prevent the problem. Sounded silly, but we did it, and never had the issue again. The car was fitted with an electric fuel pump, and an aux fan too. We kept them on all the time after that-it made for a great conversation for the rest of the trip. Good luck!
FineWynsFJ40
Too much to do...
- Thread starter
- #27
I checked, and indeed there is no fuel in the bowl. I held the pedal down for a few seconds before and during cranking, and it fired up within 5-7 seconds. I'm going to wrap some insulation around the fuel line from the pump to the carb, and then take the carb off & tinker with it.