Fuel Pump Stays On With Key In On Position

[sen2two]

So normally. The fuel pump will prime for 2-3 seconds when I turn the key to the "on" position. Now it will stay on the entire time as long as I have the key in that position.

I'm not sure what caused it. But what I did today was wire in an Autometer digitial oil pressure gauge. And an Innovate DLG-1 Dual wideband. Somewhere during the wiring, I created this issue.

And as I'm writing this now, and going over the wiring in my head. The only thing I can think of is where I am getting my switched 12v source for the relay that powers the wideband. I ran it to the diagnostic plug that is next to the brake booster. I used a spade connector and just plugged it in to the spot that receives 12v with the key in the on position.

Could that be the cause? I'm at a friend's house now or I would just walk out and try...

 

[General karthief]

Why wire it there? I didn't ask that question knowing if it was a good or a bad idea just that it's used for something specific, find a different place, I'm sure there are better places to plug it in, sounds like that was just easy peasy.
I'm sure one of the experts here can chime in.
@madmike1157 @a91what @jrichker

 

[liljoe07]

On a fox, there is no 12v to the diagnostic port. There is a fuel pump test terminal there. But it's technically a ground. And it can show 12v when the relay is not grounded. Find a different spot for your 12v switched source.

 

[General karthief]

I knew that!

 

[a91what]

+1 if you want to use the switched power for the fuel pump relay, pick it up from the relay under the drivers seat.

 

[sen2two]

So removing that wire from that plug removes the fuel pump staying on issue.

Does anyone know a switched 12v source under the hood off the top of their head?

 

[a91what]

switched 12v can be found at the fuse box under dash drivers side. a bullet connector will press in from the backside and stay in place very well. use the fused side of the radio, increase fuse by 5amps. this lets you make a clean install that's tucked out of the way and easily reversible.

 

[sen2two]

I moved it to get power from the radio 12v source since I don't have a radio. Works fine and now the fuel pump primes and shuts off as it should...