drscottsmith

So - cleaned the tank and went about testing pump. When 12v is applied to pump, it hums...

Most pumps/motors I have tested in the past will make a kind of "whirring" sound as they spin up. I am assuming this pump is bad - as it just hums and I can feel and hear the hum. I definitely do not hear the spin up I would have expected.

Before I order a pump just wanted to double check with those with experience.

Thanks -

-scott

skpyle

Try reversing the polarity. Rollers might be stuck.
Briefly reverse the polarity and see if it frees up.


Seth K. Pyle

drscottsmith

Same result both ways. I think this one is done. Not sure why, as tank seemed relatively clean when finding it out...no sludge at this point. Will inspect again when dry.

-scott

F4GIB

The inside tank pump? Porsche just doubled the price on those to $800.
Mine crapped out at 21 years. Symptom was fuel starvation.

drscottsmith

No this is the outside pump. Mine does not have a second pump inside.

-scott

waynestrutt

"When 12v is applied to pump, it hums"

Can you recognize the tune?

drscottsmith

I distinctly heard..."money, money, money, mo----ney"

Wisconsin Joe

Pfft. That's not just the fuel pump.

That's the whole car.

drscottsmith

Yep - but worth every penny!!!

WallyP

DC motors rarely hum when DC voltage is applied. Were you testing this with a battery charger or a power supply?

drscottsmith

Charger....I thought that would be enough for testing. Better with a fully charged battery?

WallyP

I was just curious about the hum. The battery charger explains it (getting some AC humps thru the charger).

Some folks have reported breaking a stuck pump loose by using jumpers from a good battery and momentarily hooking the pump up normally and with reverse voltage repeatedly.

drscottsmith

I'll try that. Still have the jumper wires on the pump. I just found after my tank has dried out that my internal strainer has disentegrated (pics coming), so it does not surprise me if junk has in fact gotten in there. I'll report back this afternoon. Thanks Wally!

drscottsmith

Wally -

Same result with normal and reverse polarity straight from battery. Can hear hum for a quick sec on pump but no spin up at all.

-scott

Chris Lockhart

Pull it off and soak the inside with Kroil for a day or three, then do Wally's back n forth polarity method. I'll bet she'll break loose.