Briggs Industrial/Commercial Opposed Twin Engines

[Mike]

Jeff, are any of the fuel lines too close to the exhaust?

[jpswift1]

The fuel lines are actually on the total opposite side of the exhaust. I think the vapor lock could be occuring right at the fuel pump, which is mounted right on the carb which is under the air cleaner, and it seems to be a location where a lot of heat rises to.

[Roger S]

Was in a GM tune up classroom decades ago.. the teacher was old enough to have been a teen in the 30's. Was talking about vapor lock and how it had to occur in the line before it was pressurized. He told a story about being out with the boys in a car and a cooler of beer. The car vaporlocked; they poured a cold beer on the fuel pump and went on. This continued through the day. At some point they realized it made more sense to drink the beer and pee on the pump.

[liflod]

Same problem I have with my engine. I still haven't put a mikuni pump in line with the stock pump, but I think that will solve the problem. I have an electric pump that I run from an alligator clip. It works great with it running.

[hydromike]

Jeff,

Plan on it being vapor lock. I think I might have posted the same info earlier, but the Onan twins that use the older carb with the pump right on the carburetor are notorious for this. Almost every one does it after a hot day of mowing. The best solution that people have come up with is to either replace the carb altogether, or go with a remote (preferably electric) fuel pump. A simple 12V pulse pump would work well, and you can mount it anywhere. It should solve the issue pronto.

~m

[jpswift1]

Thanks guys, I am glad I didnt take it out in Lake Erie and have that happen to me. I took it out today and it happened and I just had my friend take my Max and follow me, so we just towed it back.................through the mud pits, over logs, etc etc.