carter 3296 fuel pump

S

Scout survivor

New member
64 Scout 80, 152, newly replaced Carter 3296 fuel pump. The prior owner replaced the existing dual action fuel pump (original and was leaking) with a Carter 3296. It seemed to work, but now does not pump fuel. When I removed it and moved the lever arm, it moves at least 50% of the total travel before starting any pump action. Is this abnormal? I took the pump apart and it seems that the internals are OK. When it's attached to the engine, and I attach my vacuum gauge to the inlet, no pressure is generated. When it's out of the car, I can move the lever arm 5-6 times (I feel the pump starting to work after at least 50% of the arm travel) and it will build up to 8-10. Is this a defective new part?
 
I now have more information. I bought a new Carter 3296, and lever arm moves just a bit before the pump action starts. I installed the new pump, but testing the vacuum on the inlet side and pressure on the outlet side shows no response. Bench testing the unit shows that both the vacuum on the inlet side and the pressure on the outlet side are in the normal range. I looked inside the engine and turned it over, I do see the cam moving and it does seem to move closer, then further away, as expected, though I didn't measure the travel. I don't want to convert to an electric fuel pump unless it's absolutely needed. What do I do next?
 
Compare the pump arm action on the original pump vs the new ones. The load should be significantly more as the diaphragm begins to lift.
While installing the pumps, you'll want the lobe to be aways from the arm. While cranking you should feel some air pressure on the outlet and vacuum on the inlet.

Are you installing the pump with a spacer between the pump and mounting pad? If so remove it.
 
OK, here's what I found. The Carter pump that came with the car has a broken linkage arm on the lever arm (which is why it moved too much before engaging the diaphragm). I tried to attached .jpeg's but the system wouldn't let me do it. But, I still have problems. The new Carter still doesn't reach far enough to the cam to fully engage the pump. It just moves the lever arm a bit when the cam is in the engaged position. There is no spacer to remove. I have the original dual action pump (Carter 6857) and it does engage correctly with the cam lobe, so I now want to rebuild it. This pump has 8 bolts on the fuel side and 10 on the vacuum side. Do you have a kit that fits? What a saga this has been! And, that old fuel pump is way more robust than the so called replacement.
 
After I looked some more, it seems this is more likely an Airtex fuel pump, not Carter. It has a metal tag with 6857 stamped on it attached to the vacuum pump side. And a correction: there are 8 small bolts on the vacuum side and 10 on the fuel pump side.
 
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