Which wire on fuel pump plug is positive / ground

[Kellico]

Hi guys, I’ve searched everywhere-
I’m in a pickle, fuel pump died while on a drive, I was stupid and drained my primary filter and now no start. It’s not the fuse, so went to Napa got an inline pump.
I cut the deuce’s electrical wires and ready to tie in the temp pump, except I don’t know of the prestolite wires (2 that belong to the socket & plug) are hot and ground. Any help, I don’t have my volt meter with me and sitting in a parking lot.

very respectfully
Kelly

 

[Elk1111]

Turn on the switch. One wire will read 24 volts. The other will read 0.

 

[JD4044M]

Man if your stuck try it one way for a split second to see if it works. Your not going to kill the fuel pump you just want to see if it pumps first then hook it up correctly. Good Luck and if I don't have a meter I can stab the wire into me a little till I feel the juice for a simple test. Lamp Socket, Bulb and some wire in a pinch.

 

[Elk1111]

Sorry...read that wrong and didn’t see you didn’t have the volt meter.

 

[Elk1111]

Take off a marker light and see which wire lights it up. Homemade test light....

 

[NDT]

Napa had a 24 volt pump in stock? Good to know.
I guess you could stick your tongue on something metal stuck in the connector. Tingle is +24.

 

[Elk1111]

I’ve felt that tingle a couple of times. It’s somewhat unpleasant..

 

[Kellico]

Hey guys, y’all are awesome, thanks for the responses, got her running! Luck came in, the pump only runs when the hot is polarity right, did as a few mentioned, gave it juice for a split sec and figured it out. Mostly was worried I’d short it out if I had it wrong. Pulled the pump out and noticed the bottom pickup screen, propeller and plate was missing, ground wire broken? Reached in the tank and yep sitting on the bottom of a full tank of diesel. I’ll rebuild it and have a redundant fuel pump- should I keep the inline pump plumbed in?

 

[JD4044M]

I have/had In-Line Electrical Pumps on a couple vehicles with Engine Mounted Pumps. I flip it on for my 454 Chevy when extra pressure is needed, it can drink some fuel on a steep hill pulling a trailer full of hay bales floored. If you can blow air the way you want the fuel to go it will flow fuel not running.