Boiling Gas

[51 Dodge Dump]

My 51 B-3-J Dump Truck starts to spit and sputter after a couple miles driving.  Pull over/open the hood and the clear see-thru fuel filter looks like the gas is boiling.  I installed a heat shield and wrapped the fuel line with insulation, but it does not make a difference.  I had the carb. re-built and it starts easier, but that does not cure the problem either.  Any suggestions where to start.  Hesitant about trying to take it anywhere, for fer it will catch fire or quit on me.  Thanks in advance for responses. 

[kencombs]

14 minutes ago, 51 Dodge Dump said:

My 51 B-3-J Dump Truck starts to spit and sputter after a couple miles driving.  Pull over/open the hood and the clear see-thru fuel filter looks like the gas is boiling.  I installed a heat shield and wrapped the fuel line with insulation, but it does not make a difference.  I had the carb. re-built and it starts easier, but that does not cure the problem either.  Any suggestions where to start.  Hesitant about trying to take it anywhere, for fer it will catch fire or quit on me.  Thanks in advance for responses. 

I would look first for an air leak into the fuel line prior to the pump.   Air sucked in would look like boiling fuel and a couple of miles shouldn’t be enough to heat it up that much.  And a gas cap that isn’t vented would make any little leak worse.  

[wallytoo]

i think the “boiling “ gas in the bowl is a red-herring; mine also appears to boil, but the truck runs excellent.  what is your timing set to?  if too far advanced, it will sputter once the engine is hot. 

[Los_Control]

I watched a quick 5 min video the other day about this. Seems like it makes sense to me. But first things I would check is fuel flow.

Is your cap vented and working properly?  Just remove it and drive it, see if the same thing happens.

What about fuel flow? Does the tank have crap in it and running the engine draws the crap to the fuel line & plugs it up?

My old rusty tank did this, would run in the driveway for awhile then run out of gas. Connect to a gas can and no more problem.

 

I like what Tony is saying in the video it makes sense, but our tanks would need modification to allow a return line.