# Calling subaru people... Fuel Pump voltage troubleshooting help.

**URL:** <https://forums.speedlife.net/t/calling-subaru-people-fuel-pump-voltage-troubleshooting-help/249872>\
**Category:** Shift518 Automotive\
**Created:** [January 21, 2010, 4:55pm UTC](https://forums.speedlife.net/t/calling-subaru-people-fuel-pump-voltage-troubleshooting-help/249872 "2010-01-21T16:55:30Z")\
**Posts on this page:** 1\
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**Author:** ![KrazyKid](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/krazykid/32/6371_2.png) [@KrazyKid](https://forums.speedlife.net/u/KrazyKid)\
**Post date:** [January 22, 2010, 6:40am UTC](https://forums.speedlife.net/t/calling-subaru-people-fuel-pump-voltage-troubleshooting-help/249872/4 "2010-01-22T06:40:03Z")

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> [@150cc scooter... what do i need to rock it on the road?](https://forums.speedlife.net/t/150cc-scooter-what-do-i-need-to-rock-it-on-the-road/28615/17):
>
> If your car is AWD, you have a factory fuel temp sensor as well hence the weird readings and extra wires.
> 
> Those older cars used to run the fuel pump off terminals 1 and 4… black wire, and black wire with red stripe. B-R being the 12V signal.
> 
> Test/replace the relay first. They do go bad. Basic quad pole relay.
> 
> Note…You need to test for voltage at the pump clip at immediate key-on. The PCM primes the pump for ~3 seconds, then kills voltage until the motor starts. Turning the key on, then going in back to test it will typically yield no voltage signal as the prime sequence completed.

Man I didnt want to get under the dash and hunt for that relay. But its a normal 4 pole relay, like I could use a regular old square back 30a automotive relay?

I know about the priming, I had my brother turn the key while I had the volt meter on the terminals. Pin one is dead as a door nail.

Now I read a thread about a guy with the same problem, he replaced the relay and still didnt show pin 1 voltage, he then replaced the pump and it worked, even without the voltage? Who knows about that though.

So Pin one is powers the pump for a few secs to prime then pin 2 runs it constant? and pin 3 is the fuel temp sensor?

Thanks for the info so far.

240- yeah its right under the rear hatch carpet, doent even have to take a seat out or anything.

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