Fuel Fuel pump does not prime

[justadude07]

So I have a 1986 mustang gt 5.0 HO and the fuel pump stopped turning on. I replaced the relay under the seat but still no go. Im just wondering what else I should check. I saw some people say inertia switch but it is not tripped in my car. I dont know im just trying to get this figured out.

 

[AeroCoupe]

Have you pulled codes?

 

[gkomo]

Have you checked the plug on top of the tank? Maybe it came loose?

 

[91AOD5.0LX]

@jrichker is still helping us all and will always continue to do so.
Give his post a read…. Lots of great information regarding your problem:

Post in thread 'fuel pump cicuit help 86 gt 5.0 please?'

Jul 13, 2009

Fuel Pump Troubleshooting for 86 Mustangs

Clue – listen for the fuel pump to prime when you first turn the ignition switch on.
It should run for 2-5 seconds and shut off. This on and off again cycle helps to prevent
flooding the engine when cranking. To trick the fuel pump into running, find the ECC
test connector and jump the connector in the upper RH corner to ground.

If the fuse...

• jrichker

 

[nickyb]

Sometimes that inertia switch needs a good swift kick in the ass to reset. Try it its free.

 

[KRUISR]

On my '90 I found the fuel pump circuit runs through a connector in the driver side kick panel. The female pins in that connector had loosened up and would intermittently shut down the pump. I used a small screw driver to bend the ends of the female tabs more closed - to make a more solid connection when the connector is reconnected. It has worked great since - going on 3+ years now.

I actually had my power windows acting up similarly and did the same thing at the driver side power window switch - worked perfect ever since.

 

[justadude07]

Have you pulled codes?

I haven't. Car is torn apart right now. I was getting ready to drive it onto a trailer to get it painted but it decided it didnt want to start.

 

[justadude07]

Have you checked the plug on top of the tank? Maybe it came loose?

Haven't yet. I was trying to avoid dropping the tank but I'll probably have to

 

[justadude07]

@jrichker is still helping us all and will always continue to do so.
Give his post a read…. Lots of great information regarding your problem:

Post in thread 'fuel pump cicuit help 86 gt 5.0 please?'

Jul 13, 2009

Fuel Pump Troubleshooting for 86 Mustangs

Clue – listen for the fuel pump to prime when you first turn the ignition switch on.
It should run for 2-5 seconds and shut off. This on and off again cycle helps to prevent
flooding the engine when cranking. To trick the fuel pump into running, find the ECC
test connector and jump the connector in the upper RH corner to ground.

If the fuse...

• jrichker

Will do!

 

[justadude07]

Sometimes that inertia switch needs a good swift kick in the ass to reset. Try it its free.

Figured. I'll get give it some love lol

 

[justadude07]

On my '90 I found the fuel pump circuit runs through a connector in the driver side kick panel. The female pins in that connector had loosened up and would intermittently shut down the pump. I used a small screw driver to bend the ends of the female tabs more closed - to make a more solid connection when the connector is reconnected. It has worked great since - going on 3+ years now.

I actually had my power windows acting up similarly and did the same thing at the driver side power window switch - worked perfect ever since.

Alright I'll give it a shot