54 GMC 150 was a hard start last weekend when I got it but would run and drive. It did have frequent stalling at low rpms. Fuel filter that was installed by the PO was in the fuel line between the pump and carburetor. It was extremely dirty. Replaced it today thinking this could be my hard start issues. Now it is a no start issue. No fuel in the fuel filter whatsoever. Fuel pump looks like it was replaced "recently" (doesn't mean it's not still bad). Also read on here about trash in the tank. Removed gas line from tank side of the fuel pump and blew compressed air back into the tank. Reconnected and still no fuel in the fuel filter. Am I to assume that a bad pump is the culprit? Is there something I'm missing?
disconnect the fuel line after the fuel pump, put something there to catch the fuel... turn it over, if fuel is pumping out the engine side of the fuel pump, then that probably is not the problem(unless it's a tiny amount of fuel).
even if it won't start, it will pump as it turns over, if the fuel pump is working and nothing is clogged...
Also, the line from the fuel pump to the fuel filter could be kinked/clogged, double check that.
Grease Monkey, Moderator General Truck Talk & Greasy Spoon
Several issues come to mind. If it’s the original gas tank..... heavy rust or lots of trash. Clogged lines.... easy fix, replace them all. Weak fuel pump...... search for a quality one not Chinese junk. Stuck needle/seat in carburetor........ carb rebuild. Last but not least, out of gas. Good luck.🛠
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If the fuel pump is actually working, then its sucking air. Pull the hose off the pump, run it from a can of gas... If its works, your problem is b4 that. If not, its likely the pump. Make sure the connection from hose to pump is tight by the way, and that the hose is submerged in the gas..
Thanks for all the information. The old fuel filter was full of what looked like rust so i'm thinking the gas tank is the culprit. (it does have some gas by the way) Ordered a fuel pump and a tank sender unit. Going to pull the tank this weekend and inspect. Clean tank out, replace sender unit, and attach new fuel pump while inspecting all fuel lines. This will hopefully do the trick. I'll keep you all upates and thanks again for the info
Gas tank has been removed and cleaned. Lots of rust. Removed sending unit and learned why the gas gauge wasn't working......See attached photo. The new sending unit I ordered online is coming today but looks nothing like this photo. This is what I ordered...
volsfan4life, man what year so far huh? Big one coming up Sat, hope they're ready, if they are they have a chance.....
re. your fuel sender, That sender will work fine. I've got the same in my 49 Chevy 3100 with a 54 tank. Even though it's a top feed, once the line is primed up to the pump it'll flow on it's own with little effort needed from the pump.
With everything connected up remove the plugs to get the fuel pumped up to the carb 1st, saves wear and tear on the starter and battery. You might disconnect the line at the carb and insert it into a mason jar etc., then spin it to ensure you've got good clean fuel to the carb then reconnect and spin it to fill the float bowl. Then test fire... Good luck Dave