Electric fuel pump

ok guys, i had to buy one of those small aftermarket fuel pumps for my 350 install into the 49 Coronet. I have a few questions about how to make sure that I am wiring it properly. To test it, I just ran the hot wire to the starter hot wire and grounded it and it fired up the beast. How should I wire it permanently when I rewire the care and ignition switch. Does it run all the time when the car is started (stupis question I'm sure - but I didn't know if it had some kind of surge in it)? A vrey easy explanation of where to wire it would be helpful. THanks in advance.

 

yes, you need it to run when he ignition is on only


this is how i would wire it: i'd put it on it's own circuit breaker directly from the battery. you can get that off the battery lug on the the starter. then i would use a relay that is triggered when the ignition is in the on position ..you could also put a switch in there to to turn it on/off

 

Just a suggestion, but it worked for me. When you find your source for B+...12V, I would use a toggle switch or similar to turn it on and off. I run a flathead, triple carbs. The center carb picked up a piece of dirt under the needle (float chamber). Flooded. No idle. Heavy traffic to get home. So, it was turn the pump on, start the car. When the engine started to "bog" (run out of fuel), turn the pump on for a few seconds. Then, shut it off. On and off, over and over, for a few seconds at a time while I drove. It got me home!!
I have always switched electric pumps. Also, if no label, a simple, and maybe effective, anti-theft device to a casual thief.
Now you'll get a lot of replies. Many will be right on with different ideas. A few will be off the mark.
36-3window has the relay idea and it's a good one. Add the switch and next thing you know, Old Jed's a millionaire!!

 

I would second the toggle switch you may not ever need to use it but if you do you'll be glad you did you can always just leave it on so it runs with the key

 

>>>>>, I have my Holley Blue Electric Fuel pump in my '27 T wired to the fuse panel ,,then to a seperate switch under the dash ,,NOT wired to the ignition key ,,i turn it on first ,,listen to hear it runnin' ,,then hit my ignition ,,
AND,,just like Flatheadguy & Russco said ,,when the needle n seats in my two Holley carbs started leaking ,,i could shut it off ,,run till the float bowls got almost empty and the motor started sputtering ,,then flip it back on ,,then ,,well ,,it got me home from 40 miles out ,,
in othere words ;,,the electric pump don't need to be wired to the ignition switch ,,,

 

440 is right I should have been more clear run it with the ignition AND have a toggle you can shut off if need be

BTW I loved those ford crash switches when I drove a tow truck you could hit the rear 1/4 panel on a tempo with your hand a cut off the fuel pump

 

I also like to run them off the ignition and a separate switch. works for slowing down theft and a good safety feature.

 

I'm going to go with everybodys suggestion. Have it run through the ignition circuit, so it's only on when the switch is on, power it with a relay, since they do draw quite a bit, and install a seperate toggle so you can turn it off it you want to. This can be wired in between the ignition switch and the relay.

Another way to consider: GM used a pressure switch on their oil system to trigger the fuel pump on some S-10s. It would not trigger the fuel pump until some nominal amount of oil pressure was seen. Would not be hard to set up, a Hobbs pressure switch would do it, but having to wait like that would drive me nuts.

I have 1 vehicle with an electric fuel pump. It is wired full hot to the toggle, then straight to the pump. A relay would help with the current draw, but I've not yet had trouble with it. The switch is mounted in a panel with 4 other toggles, none lablelled. Only I know what does what.

Devin

 

thanks so much for all the replies...so on the ignition switch i want to attach it to the I pole or the S pole? What about the A pole?