Mechanical fuel pumps works only sometimes? - Mustang Evolution

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Old 12-20-2011, 10:30 PM   #1
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Mechanical fuel pumps works only sometimes?

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?
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Old 12-20-2011, 11:26 PM   #2
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Mechanical fuel pumps works only sometimes?

You could have a leak between the tank and the pump.
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Old 12-21-2011, 12:25 AM   #3
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Mechanical fuel pumps works only sometimes?

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