Classic Mustangs (Tech)Technical discussions about the Mustangs of yester-year.
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Okay, we've got the motor in the car (the motor mounts were transposed by the way, and the inch gap disappeared when we switched them) and we're ALMOST there. We're cranking, we're getting spark, but for some reason the mechanical fuel pump isn't getting fuel to the carburetor. When we pull it out and manually pump it, the fuel flows, but when we mount in on the block, and crank the motor, nada. Any suggestions? Is it possible that we're mounting it incorrectly? Anybody have a similar problem?
Thanks in advance!
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We just got the motor back from the machine shop for a complete rebuild. I can't imagine something has loosened up since the motor hasn't been started yet. Is it possible they forgot to put something in?
yah. that's another idea. II'd call the shop who rebuilt it and ask them.
Tell em you have a mechanical fuel pump that is not operated.
See what they have to say about that. If you have a electrical pump from a difference car you can use in the meantime work away but you have to regulate the pressure.
You don't want to throw more than 7psi of fuel towards a carb
My guess is as well no or bad camlobe as well. maybe they have other suggestions. i'd call
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There is no cam lobe on a sbf for the pump. The fuel pump eccentric is bolted to the front of the cam. I suspect they didn't install one, didn't torque it down tight enough, or they used the wrong dowell pin in the end of the cam which would let the eccentric float.
Put a little bit of white grease on the Fuel Pump arm, install it, crank it. Pull the pump off and see if the grease has been disturbed. If it hasn't, there's no eccentric or it's too far from teh arm to reach it. Are you using any type of plasic spacer on the fuel pump mount? (Phenolic spacer)
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Originally Posted by LostBoyz
if you are getting 29mpg in your 5.0, you aren't driving it correctly
You can tell if there's an eccentric when you install the pump. You SHOULD have to angle the pump arm downward to get it under the eccentric, and then manhandle it a bit to get the bolt holes to line up. If not, then the eccentric is either loose or not there.
Who cares how much horsepower it has, all that matters is how fast it goes!
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My bet is there is no eccentric installed. Unless you specified a manual fuel pump, they probably left it off. I am not sure why all engine builder do not install the eccentric even if you are running an electric pump. I do not know why it would hurt, but some do not b/c they assume you are using an electric pump.
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