89 Mustangs not starting (fuel pump not priming)

sggarcia

New Member
Jun 2, 2022
2
0
1
Thank you for allowing me on this forum. I hope that I can get some advice from all the pro's here. I have two mustangs, both 89's 302 stock engines that are doing exactly the same thing. They were working and then I parked them for a while and now that I went to turn them on, they both crank but it wont start. I used to hear the fuel pumps priming but now I dont. They used to work fine with no issues. One one, I checked power to the relay under the drivers seat and I get power. I checked power to the inertia cables and I get power to that too. Is there anything else that I could check? I had heard that there might be a fuse by the brake booster but I am not sure. If there is one, where would it be? Thank you for all your input. It is much appreciated.
 
  • Sponsors (?)


General karthief

wonder how much it would cost to ship you a pair
Mod Dude
Aug 25, 2016
23,699
8,760
203
 
  • Like
Reactions: 1 user

Gs1987GT

Active Member
Sep 25, 2019
473
178
53
Follow the checklist posted by general step by step, dont skip any steps. You will find the issue if you do.

I will say if you have two 89 mustang's and they both do the exact same thing that is quite odd. What is the condition of the batteries? Age? Voltage? Load tested? You should hear the fuel pump prime everytime you cycle the key. That is an issue. Will it attempt to fire if you spray a little either in the throttle body?
 

sggarcia

New Member
Jun 2, 2022
2
0
1
Follow the checklist posted by general step by step, dont skip any steps. You will find the issue if you do.

I will say if you have two 89 mustang's and they both do the exact same thing that is quite odd. What is the condition of the batteries? Age? Voltage? Load tested? You should hear the fuel pump prime everytime you cycle the key. That is an issue. Will it attempt to fire if you spray a little either in the throttle body?
Follow the checklist posted by general step by step, dont skip any steps. You will find the issue if you do.

I will say if you have two 89 mustang's and they both do the exact same thing that is quite odd. What is the condition of the batteries? Age? Voltage? Load tested? You should hear the fuel pump prime everytime you cycle the key. That is an issue. Will it attempt to fire if you spray a little either in the throttle body?
I have put a new battery on them and they both crank. I will check the list by general. It is very strange that both were working and I could hear the pump being primed every time I would turn the ignition switch on but then I parked them for a several months and then both started having the same issues. Very strange to me. I am hoping to spend some time this weekend and try this check list and see if they will start with some fluid. Thank you.
 

John Dirks Jr

there is enough sticking out to grab on to
5 Year Member
Jun 28, 2013
2,978
1,300
174
Sometimes when the pump won’t prime, it’s caused by failing capacitors in the ECU. The timed (2-3 seconds) prime function is controlled by the ECU. You don’t have to have high mileage for the capacitors to fail. They do it with age.
 
  • Agree
Reactions: 1 user