No Fuel

[MATT KASPER]

So I had my 73' 350 running great after rebuilding the carb, replacing the fuel tank, fuel pick up and most of the fuel lines. On my way home from a hunting trip I blew my exhaust gasket. The truck sat for the rest of the winter and I went to fire it up after tightening the bolts on the header to see if that would help the exhaust leak. I wasn't getting any fuel so I replaced the fuel pump thinking that was the only piece of the fuel system that was not replaced. Still no fuel. I replaced the fuel filter and it is clear so it is really easy to see whether fuel is getting to the carb. I do have two tanks and the fuel line goes into a valve which is the only thing I can think of that could be causing the problem at this point. Any words of wisdom???

 

[1987 GMC Jimmy]

You could always drop a piece of line in a fuel can behind the pump to see if fires up and rule everything out above that. You could also do a temporary bypass of the valve to rule that out specifically. The only thing you should be looking at besides that are rotten rubber lines at the tanks sucking in air or am issue in the tank with the rotten mini fuel lines on the actual sender or a clogged strainer sock.

 

[MATT KASPER]

That is along the lines of what I was about to do. Just wanted to make sure I wasn't overlooking something.

 

[Charlie]

 

[dvdswan]

On the selector valve, the fuel line that is closest to the solenoid is the main tank, furthest is the aux tank. You could put a gallon or 2 of gas in the main tank to see if it will start. This would be a quick way to determine if the selector valve is bad or going bad. You can test the valve by removing it, attach a ground wire to the body then take a 12v jump wire from the battery and touch it to the single post on the valve. If the valve is good you will feel and might hear the click of the valve switching. If the truck starts after adding gas and the valve does switch you may have a problem from the selector switch to valve wiring.

 

[chengny]

The only thing you should be looking at besides that are rotten rubber lines at the tanks sucking in air or am issue in the tank with the rotten mini fuel lines

2X Jesse's suggestion as above. But since you are unable to pull from either tank, take a good look at the short section of rubber hose that connects the transfer valve outlet port to the steel tubing (that leads forward to the fuel pump inlet). Since that piece of hose is common to both tanks, a break in it would cause a loss of suction from both sides. It is shown below - marked in red:

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[highdesertrange]

did you try to prime the carb. highdesertranger