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73-87 Chevy _ GMC Trucks => Electrical => Topic started by: werewolfx13 on August 13, 2013, 09:43:44 pm

Title: fuel pump short to ground in the tank?
Post by: werewolfx13 on August 13, 2013, 09:43:44 pm

I've got the tank from my '87 v20 bolted to my k20 for safe keeping until I can swap the TBI 350 out of the v20, and I thought I had a brilliant idea..I'd like to use the 87 tank for extra fuel "storage". I assumed I could mount a toggle switch in the cab, energize the pump, and fuel would flow across the rubber line running across to the other tank...but first, I decided to throw a continuity tester on the pump wiring and make sure neither wire grounds out (I attached a ground strap from the sending unit retaining ring to the frame of the truck already)..problem is, both the pink wire AND the brown/white wire show a short to ground...I can't imagine the pump should show that its grounded out, should it?

Thanks in advance.

Title: Re: fuel pump short to ground in the tank?
Post by: VileZambonie on August 19, 2013, 07:25:04 pm

If the circuit is complete you should show continuity to ground. When you energize the circuit all of the voltage will be dropped after the pump on the negative side. If it's shorted you would blow your circuit protection immediately.

Title: Re: fuel pump short to ground in the tank?
Post by: werewolfx13 on August 20, 2013, 03:22:39 pm

Thanks Vile, that thought crossed my mind over the last couple days, I just needed it confirmed.