Help! Stuck at gas station

[Fusion]

Weird ass situation. The pump runs fine off a secondary battery. Both have over 12V.
The car won't start with the pump plug on (car battery) but will with the secondary battery. And while the pump is running off the secondary battery and engine is running, the pump connector (now not plugged in) is showing 13+V.
I tried disconnecting the secondary batt and pluging the pump connector in real fast but the pump won't keep running.

Mind = blown

[Fusion]

That idea came to mind so I checked yesterday, bought on ebay from TrePerformance and they seem legit.

[Jaxx_]

just curious, where did you buy your walbro? There are a lot of fakes.

[Fusion]

Thanks guys.
Should I be checking the ground from the relay or on the pump connector?
I think I read somewhere that even the big groung wire (engine->body) could effect this?

[b*saint]

I agree with checking the ground.

[Fusion]

Battery should be at 12+ volts with the engine off, 14 or so with it running. If yours is showing 11.6, it's dead.

It was 12.2 but after some attempts at starting it etc. it dropped to 11.6. I sat there over an hour.

I'll check the contacts. I soldered them myself back when I installed the pump (E30 carrier modified to fit the Walbro), but that could be a weak spot.

[Danny]

I actually just did my dad's fuel pump yesterday. Check the contacts underneath the connector on top of the fuel pump carrier. His we're old and the wires were no longer making good contact. I soldered on new wires with heat shrink and all is well.

[AndrewBird]

Battery should be at 12+ volts with the engine off, 14 or so with it running. If yours is showing 11.6, it's dead.

[Fusion]

Had to get a friend to tow me.
Any idea why a year old Walbro would die? Is there any chance of getting it running again?
And is it normal that there's about 1.8V on the pump connector all the time even with the key out?

[travish325]

did you check your ground on the pump?

[Fusion]

Ok I'm retarded, 11V starting so pump is dead.
Fuuuuuu Walbro only has 8K miles.

[Fusion]

Even jumped getting 2.0V.
Voltage to and from relay/jumper is ~12V

[Fusion]

FP gets 2.0V even with key off

[Thizzelle]

blue one in middle

[Fusion]

M50 swap
The pump needs 12V
Battery is fine, showing 11.6V