regular flooding - carb or fuel pump?
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Senior User
Joined: Jan 2005
Posts: 180
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regular flooding - carb or fuel pump?
1980 I-6 4.9L single barrel carb.
It's getting more and more frequent. The truck doesn't want to start if not parked on perfectly level ground. if the road is cambered, it is flooded and I have to clamp the fuel line and crank it over a bit before it'll start. It then dies, I get out, unclamp the fuel line, and it works fine. Rinse and repeat.
Theory 1 - carb related... does this carb have floats or anything that is supposed to stop flow when not running ?
Theory 2 - fuel pump related... it's allowing fuel to keep flowing after the motor is shutoff.
Any ideas?
It's getting more and more frequent. The truck doesn't want to start if not parked on perfectly level ground. if the road is cambered, it is flooded and I have to clamp the fuel line and crank it over a bit before it'll start. It then dies, I get out, unclamp the fuel line, and it works fine. Rinse and repeat.
Theory 1 - carb related... does this carb have floats or anything that is supposed to stop flow when not running ?
Theory 2 - fuel pump related... it's allowing fuel to keep flowing after the motor is shutoff.
Any ideas?
Fleet Mechanic
Joined: Apr 2007
Posts: 1,429
Likes: 4
From: patricia ab canada
# 1 yes it has floats
# 2 no the fuel pumpwon't pump with the engine off.unles there is an aftermarket eletric fuel pump on the truck.or your gas tank is pressuring up, forcing fuel up the line.check you tank vents.
My guess is it sounds like it's time for a carb rebuild. IMO.
# 2 no the fuel pumpwon't pump with the engine off.unles there is an aftermarket eletric fuel pump on the truck.or your gas tank is pressuring up, forcing fuel up the line.check you tank vents.
My guess is it sounds like it's time for a carb rebuild. IMO.
5th Wheeling
Joined: Oct 2009
Posts: 47
Likes: 0
I was looking for rebuild info. myself. I have never done one before, but I found a reman one from national carb for $150, and was thinking of going this route because of just " swapping out".
