Mechanical fuel pump replaced question

[blazer74]

Was there resistance when installing the fuel pump. The lever of the pump to the pushrod?  You need to know if the pump is actually pumping fuel with a known positive supply.


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[fatahaunter]

My boss used to own the same year truck, and he said when he ran out of gas, it wouldnt start back up until he got an air compressor and shot a little bit of compressed air into the gas tank from the filler neck. Does that sound like it would even do anything?

[enaberif]

My boss used to own the same year truck, and he said when he ran out of gas, it wouldnt start back up until he got an air compressor and shot a little bit of compressed air into the gas tank from the filler neck. Does that sound like it would even do anything?

If you run out of fuel put some fuel into the vent of the carb to fill the float bowl. But yes putting air into the tank can push gas up to the carb.

[bd]

Even though the fuel filter is new, remove it and blow through it.  Is there any restriction?  Perform fuel pump draw (+20" Hg vacuum), pressure (5-7 PSI) and volume (~1 qt in 20 secs of cranking) tests using an external fuel source rather than the vehicle's fuel tank.  If you don't want to do it yourself then find someone to do it for you.  This is a fundamental check for diagnosing a fuel delivery problem.

This will help determine whether the problem is isolated to the fuel pump's function, including whether there is insufficient stroke on the fuel pump pushrod.  If the cam's fuel pump eccentric or the pump pushrod are badly worn or the rod is sticking in the out position, there won't be sufficient stroke to operate the pump efficiently, even if the rest of the fuel system is in perfect order.