Lost Fuel Pressure

[custodian]

I was driving my 86 Dually home after putting some gas in the drivers side tank and it just cut off. Had my wife come and pull it home. I poured some gas in the carb and it run. I removed the fuel inlet at the carb, no pressure, and put an empty clear bottle on the end of the line and turned the motor over and no gas. I have dual tanks and was running on the drivers tank. I'm thinking it's just the fuel pump.

Now my question: If the tank switch goes bad would that block the fuel to the fuel pump? The tank switch had been working before. It will not crank in either the passenger side tank or the drivers side tank.

 

[nvrenuf]

Does that truck have a mechanical pump on the engine? I’d see if there’s fuel at the inlet side.

 

[custodian]

Does that truck have a mechanical pump on the engine? I’d see if there’s fuel at the inlet side.

Yes, mechanical pump on the motor, 454, and no fuel when I removed the inlet line to the pump.

 

[Broken85]

If you get under the truck and have someone throw the switch, you should hear the valve move. If you hear it working, I’d start looking at the fuel pump