Mack A-20

[Vladislav]

Those cooper lines are avalible new by foot (by meter in my country), just be sure to order the soft kind, not straight pipes which actually tough to bend. Also be sure checking the size since there's a trick with actual cooper pipe size and how it's marked in the sales lists. For fittings you can look Parker Fitting which would cover any need on whatever you break in the gas line. Vlad

[Carson]

Thank you Terry and 41chevy I will give it a try.

[Maddog13407]

another trick i use on stubborn air hoses or fittings is place a hammer on the flat hex part of the nut and strike the ajacent side with another hammer. not enough to deform it, just enough to 'shock' it

[Carson]

PB blaster is great stuff!

I have question about the fuel system. Gas is not getting to the carb, with a little gas poured into the carb she starts and runs for  5 sec or so. I have disconnected the fuel line below the carb and no gas comes out of the line. I have added gas to the carb 4 or 5 times, she starts and runs but no gas come through the line. I have cleared the gas line from the pump to the tank. Truck hasn't been started in 10 years, so how long should it take for the gas to reach the carb from the tank? Any other advice would be helpful too.

 

Thanks

[terry]

Is the layout with the line off the pump it should gravity feed the pump ? Maybe pump is bad?    terry

Edited September 6, 2020 by terry

[Carson]

Look like fuel pump is not working. 

The pump is AC 855573, any idea where to find this pump or have it rebuilt. Thanks

[Phase 1]

First make sure there is fuel to the pump. Then check the fuel pump actuating arm, it could be stuck from rust.  When the pump is off pump the arm and see if there is vacuum and pressure at the ports. There could be a problem at the check valves in the pump.

[Carson]

Anybody who has older Mack truck with a gas engine, I need some advice on where to get a fuel pump or have the old pump rebuilt. 

AC Delco 314 GC 215A

Thanks!

[Scottyairborne]

I bought a cheap one online, cleaned the tank first, a second in-line filter, wired to an existing switch.  It works a dream, you don’t need but a couple psi to maintain just slight pressure.