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BJ7 fuel pump connections

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RestoreThemAll

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I have a positive ground BJ7 with an SU solid state fuel pump. When I drove this car during the 1970s it had a JC Whitney fuel pump. I have no idea of where the single white wire from the fuse box connects.

As you can see in the attached pic circled in red, there are two electrical connections. I'm assuming the connection nearest the outlet pipe is for ground? Then the connection at the back of the pump would be where the white wire from the fuse box connects?

Then circled in yellow is what looks like a vent. Is there a hose or something that connects there? Circled in green seems to be a vent capped off?

Just trying to understand and get it right.

BTW; who mounts a fuel pump practically in a wheel well? :highly_amused:
Dale
 

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Hi Dale,

Your assumptions are entirely correct. I've read that the 'vent' was supposed to be vented into the boot, although I've never seen a car with anything on this vent. I ran a tube into the boot on top of the tank; but I don't think it's really necessary. These are diaphragm pumps and they do need the vent to allow for air movement caused by the diaphragm movement.

Your connection to power is correct. The capped vent at the end opposite the valve body allows ozone-rich air to vent (the points arcing creates the ozone). If the pump is solid state you theoretically don't need that vent--the pump will still vent from the other vent--but the cap is necessary to prevent water from getting into the electrical bits (I had a solid state pump fail and we surmised some water got in and caused a short in the circuitry).

The other connection is indeed for a ground. Although the pumps are largely grounded through the valve body and the bolts/studs on the bracket, it's not a bad idea to have an additional ground to any appropriate place on the chassis.
 
Thanks Bob.

Maybe I'll run a short hose to no place off the vent with a loop in it just to help keep water and debris out. I will add the extra ground. Easy enough to do while I'm there.

Dale
 
I should add that the pump body (solenoid) is somewhat electrically isolated from the (grounded) valve body by the rubber/fabric edge of the diaphragm--so the ground terminal is theoretically necessary--in my experience the through screws provide an adequate ground.
 
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