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Mazda Engine General \  Hot Carb!

Hot Carb!

Mazda Engine General Mazda Engine Mazda Tech
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replies 3
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motorboater   +1y
Hey guys, I have a problem with my carb, I think. I have a 91 b2200 2.2 and it seems after a long ride I will stop and then get back on the road and the truck will stall and have no fuel in the filter. I can crank forever without drawing fuel into carb so I just put a shot or two of gas directly into carb and it causes it to draw fuel again and I see the filter filling up and then it runs fine and gets me wherever i need. So I figured I need a new mechanical fuel pump because its losing its prime. But when I add the shot or two of gas it instantly boils in the carb and that seems way too hot in my opinion. This motor does recirculate exhaust gas from the manifold back to the carb, maybe something there. Anyone have this problem before or any educated guesses on why the carb is so hot? Or is this normal?
jenko   +1y
Where are you putting the fuel?

Anywho, it does sound like you're losing prime so a rebuild/new pump will rectify the problem anyway

I wouldn't be worried about the hot carb, everything is hot under a hood especially when it sits not running for a little bit
Gas is supposed to evaporate
motorboater   +1y
yea, i plan on replacing the fuel pump either way. I figured I would get some opinions on the carb. The gas isnt evaporating though, it boils as soon as I pour it into the carb. Just seems way too hot to me, but thanks for the response man.
jenko   +1y
Perhaps I should have said "supposed to vaporize"... evaporation and boiling are both forms of vaporization. lol
1 occurs "mostly" as the surface of a liquid, the other anywhere in the liquid.

Depends on the fuel for the boiling point, but I wouldn't worry.
The carb is cooler when it's running, so next time it's running check the difference in temperature between, sitting for a minute turned off vs running. (just for shits and giggles really)
It's just heat soak
It shouldn't be hot enough to boil gasoline when it's running, though I have seem some non-crossflow engines do just that!
Wheres some "older" members, they'll tell you about boiling off gas once their vehicles have stopped, who's from Arizona? lol
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