[macdaibhidh]

Soemtimes it will work and sometimes not!?

I replaced the mechanical fuel pump on my 1979 mustang pace car 2.3l turbo cause i thought the fuel pump was bad cause it did nto work!

but even the new one sometimes will pull fuel but most of the time it does not?

Today i put the fuel line directly into a gas can of fuel and the breather into an empty pail, the pump worked and the car ran great, then i turned off the car after it ran about 3-4 minutes and then when to start it again then the fricken pump would nto work again and will not pull fuel now again!?

is this a bad pump even though its new? or is there something eles more serious wrong here?

 

[imported_Matt]

You could have a leak between the tank and the pump.

 

[imported_evan]

There is a plunger, or pushrod that drives the pump arm.
It's probably all gummed up and stuck.