fuel pump not working in the cold

[JessicaLynn]

I'm new to this forum stuff. Fuel pump not coming on in the cold. But when it warms up outside it kicks on with no problem. Changed the fuel relay the other night. Still nothin. but the next day it worked fine. Ordered a new fuel pump. its in today. Thinking it has something to do with the electrical in the fuel pump. since the cold is the only thing effecting it. Just looking for conformation that I'm right b4 i actually drop the tank and change it out. thanks for any help.

Jessica

 

[5.0Droptop]

Id say your on the right track.

Does the car crank over fine when the pump will not come on?

 

[JessicaLynn]

no. when I dont hear the pump kick on the car wont crank on. the starter just turns. about to go see if she'll start now. lol hopefully its warm enough. my new fuel pump is waiting at the parts store for me.

 

[5.0Droptop]

That's what I meant. The engine will turn but not start.

 

[JessicaLynn]

Yes. Engine turns but won't start. Finally got it started about noon. Just got the fuel pump. Now about to get under it to drop the tank. Never have done this b4. Should b fun. Lol

 

[jrichker]

You posted a TECH question in Talk. This limits your chances of getting some really good advice, since most guys aren't looking for Tech stuff in the Talk forum.

Having said that, here’s some help…
Post the model year of you car and I will post the fuel pump troubleshooting test path for you model year car. It will greatly simplify troubleshooting the fuel pump system.
The wiring for 5.0 EFI Mustangs runs in four different groups, 86, 87-90, 91-93 and 94-95. All are slightly different from each other.

 

[JessicaLynn]

Oh. Didn't know. Thanks. Already changed the fuel pump. Wasn't the problem. It was the safety shut off switch in the back hatch. But thank you for the help. This was my 1st time trying the forum stuff.