Fuel pump stopped working a couple of days ago, could it be the relay board Options

[JimN73]

I have no power at the pump.

I have 12.4 volts at pin #13 on the relay board.

No power at pin #5 or 7, old eyes can't see the stripe colors very well.

Fuses are good.

Am I missing something?

Thanks in advance.

[euro911]

When you turn the key to the 'on' position, check for 12 volts at pin 8. This voltage energizes the coil (contact point 85) in the power relay, which upon closure (contact point 87), passes 12 volts to energize the coil (contact point 85) in the fuel pump relay. This is where pin 13 derives power to run the pump. (Make sure to check for voltage at pin 12 too. Voltage from pin 12 passes through the power relay to the pump relay's coil).

Also, make sure that contact point 86 from each relay socket on the relay board have continuity to ground.


You can test the individual relays by using test leads with alligator clips and a multimeter (VOM)

Remove the relay(s) from the board. Apply 12 volts to contacts 85 & 86 to energize the relay ... you should read continuity (closure) between contact points 30 & 87. If not, repair or replace the relay(s).

Yes, you can pop the covers on the relays and lightly burnish the contacts. I typically use a small strip of standard 20# bond [printer] paper, as it will clean the contacts without removing the protective coating.