Fuel pump question
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Fuel pump question
Hello I have a 1978 ford f250 4wd with the 351M. I am trying to find out if there is a way to check the mechanical fuel pump if the truck won't start. Thank you so very much for the help...
Laughing Gas
Joined: Nov 2013
Posts: 1,207
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From: S.E. Louisiana;so far USA
The 1978 Ford Truck Shop Manual says the fuel pump for the 351M should make 6.0-8.0 P.S.I. with a volume of at least 1 pint in 20 seconds with temperature normalized, at curb idle speed in neutral.
Fleet Mechanic
Joined: Jul 2013
Posts: 1,997
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From: NE Ohio
If you just crack the fitting to carb, you should see gas when cranking. Unless you do as Ozzie posted and keep the fitting/hose in a container to measure output. This will prevent a lot of gas from dumping on the engine potentially.
The best thing to do is get a fuel pressure gauge also.
I had a mechanical pump putting out 3psi and after 10 minutes it couldn't pump anymore.
the gauge helped figure that out.
The best thing to do is get a fuel pressure gauge also.
I had a mechanical pump putting out 3psi and after 10 minutes it couldn't pump anymore.
the gauge helped figure that out.
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