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Old 12-10-2017, 04:58 PM   #1
1ofakind03
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Member#: 472184
Join Date: Aug 2017
Default Fuel pump won't turn on, replaced relay

Hey Guys, have a 93 Jdm wrx, could easily be a very stupid question. But I'm in the process of putting my motor back in my car (not currently in) but I wanted to drain the majority of the old fuel out. So with the motor out I figured I'd just cycle the key to get it to prime into a bucket under the hood, no dice. Wouldn't prime? So I got a couple new relays and swapped them, again no luck. I got power at the relay 12v checked with the multimeter and obviously no power at the pump since the relay isn't clicking..

so I jumped the relay with a wire and the pump turns on and pumps fuel nicely. Now that it's all drained what's going on? Is it because my motor isn't in yet? Or do I have another issue?

Sorry if this is the dumbest question but id like to be able to just pop the motor in and not have many hiccups.

Thanks all for the help!
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Old 12-10-2017, 11:20 PM   #2
CosmoTheCat
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Member#: 3409
Join Date: Jan 2001
Chapter/Region: NWIC
Location: Oly
Vehicle:
98 My FMIC
Is bigger than yours.

Default

I'm not sure if all of them are this way, but I've noticed that a number of Subarus will not prime the fuel pump if the ECU doesn't see certain engine sensors plugged in.

It's nice because there's nothing quite so annoying as draining the tank while pushing a car out the back of the shop because the fuel pump relay is buried up under the dash.


In your case, I'd just take the fuel pump relay out and run a jumper between the 12v hot lead and the load lead.
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Old 12-11-2017, 11:33 AM   #3
IanT-EJ22
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Chapter/Region: NESIC
Location: Waterbury Center, Vermont
Vehicle:
2000 Impreza Wagon
Silver

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Quote:
Originally Posted by CosmoTheCat View Post
I'm not sure if all of them are this way, but I've noticed that a number of Subarus will not prime the fuel pump if the ECU doesn't see certain engine sensors plugged in.

It's nice because there's nothing quite so annoying as draining the tank while pushing a car out the back of the shop because the fuel pump relay is buried up under the dash.


In your case, I'd just take the fuel pump relay out and run a jumper between the 12v hot lead and the load lead.
Hes right, the way the power is routed, the ecu stands in the way of the fuel pump relay. I would like to know exactly how the flow of current goes but something between the fusebox, ignition, fuel pump and its relay is such that the pump only runs with certain other circuits completed.

Last edited by IanT-EJ22; 01-31-2018 at 05:31 PM.
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Old 12-11-2017, 12:31 PM   #4
1ofakind03
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Member#: 472184
Join Date: Aug 2017
Default

Quote:
Originally Posted by CosmoTheCat View Post
I'm not sure if all of them are this way, but I've noticed that a number of Subarus will not prime the fuel pump if the ECU doesn't see certain engine sensors plugged in.

It's nice because there's nothing quite so annoying as draining the tank while pushing a car out the back of the shop because the fuel pump relay is buried up under the dash.


In your case, I'd just take the fuel pump relay out and run a jumper between the 12v hot lead and the load lead.

Well I managed to get the fuel pump relay out and jumper it. Drained all the fuel and now it's almost ready to drop the motor in. Thank you for confirming I figured it might be a safety thing Subaru had incorporated
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Old 12-16-2017, 05:49 AM   #5
CosmoTheCat
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Chapter/Region: NWIC
Location: Oly
Vehicle:
98 My FMIC
Is bigger than yours.

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Good stuff.
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