Mechanical Fuel Pump '65 289 Troubleshooting - MustangForums.com


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Old 09-04-2008, 11:24 PM   #1
1965AggieMustang
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Default Mechanical Fuel Pump '65 289 Troubleshooting

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!

Travis
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Old 09-04-2008, 11:33 PM   #2
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It's possible the front cam bolt loosened up, allowing the fuel pump eccentric to flop around. Gotta pull the timing cover to fix that=/
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Old 09-05-2008, 08:50 AM   #3
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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?
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Old 09-05-2008, 10:14 AM   #4
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could have they put a new cam in that doesn't have a lobe for the mechanical pump?
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Old 09-05-2008, 10:31 AM   #5
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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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Old 09-05-2008, 10:36 AM   #6
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that's what happened with my brother's mopar. rebuilt the 440 with different cams. ended up there was no lobe for the mechanical pump and had to put on an electric fuel pump.
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Old 09-05-2008, 12:02 PM   #7
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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.
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Old 09-05-2008, 12:15 PM   #8
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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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Old 09-05-2008, 01:35 PM   #9
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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.
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Old 09-05-2008, 01:40 PM   #10
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^^^ Yeah, what he said.
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