fj62 cranks but won't start, bad fuel pump?

[c7train]

IT"S ALIVE!

I found a bad set of wires! The wires that people mentioned in the left rear quarter panel "looked good" at first, but after further inspection it was in fact limiting the voltage going to the pump not allowing it to turn on under cranking, and also created a pass/fail scenario of the paperclip test, it failed due to the pump not turning on, but passed because I got voltage at the pump.

Anyway, Yea I wish I never cut a hole in my cruiser and just dropped the tank, it would have inadvertantly lead me to the problem due to the plug that would unhood the wires being the problem after all. Alas, now I get to fab up a nice looking trap door (I don't want it to look like sheeet) so I can sleep at night after hacking into my rust free body.

Cheers and thanks for all the help, you are all so knowledgeable.

Oh, now my turn signals are not working, ideas?
C

 

[Shop Toy]

Woohoo!!

Glad you got it running!

I'm tackling mine tomorrow...been too busy here at the shop. I'm thinking mine is the same issue as yours. I had an issue with my rear wiper turning itself on which ended up being water in the back left causing weird things with the relay. So I probably have a few issues back there.

I had dynomat'd my truck a few months back, so I removed it around the cut for the pump access and plan to put a little silicone at the cut and then cover the whole spot with a new sheet of dynomat. I think that should be sufficient.

Congrats on the fix!!

Cory

 

[Shop Toy]

Wanted to update so others could more easily resolve their issue if it's the same...

The main issue with my truck ended up being the 4 wire plug in the left rear corner that controlled power to the pump itself. Water had entered through a rust hole in the front corner of left rear quarter panel. The 4 wire plug sits on the bottom of that area and got hit with quite a bit of water during rain driving. The power wire had basically rusted apart and was causing the loss of power. I cut the plug out of the equation and made some nice, new, clean, connections. That resolved the lack of power to the fuel pump.

I replaced several parts in the fuel pump system while trying to resolve this problem. I feel like they were due to be replaced anyway, so not really a loss. But the amount of down time spent looking for what ended up being one bad connection is was upsets me.

A very simple thing that caused me some headache was when testing the wires at the pump itself, I forgot the pump hanger assembly becomes its own ground point when installed in the tank. Without it, if testing the lines for power, you won't see a voltage as the circuit isn't grounded. So I had resolved the problem at one point but was not sure I had done so as I didn't see 12 volts on the wire. I realized the lack of ground, put the fuel hanger back in place and connected the plug to the pump and got power. Simple but wanted to be sure others weren't duped by the same thing.

Super glad to have the truck up and running again. I was stuck driving my Diesel Dodge Ram which wasn't happy with being put back into daily service. It's old and likes to be used every so often with plenty of rest in between.

Cory

 

[RECRUISER]

I pulled these pictures (see below) to show the shape of the cutout needed to create your own service door to the fj62 fuel tank. This thread was very helpful to me, but I had to search elsewhere for the pictures.
I just used a cordless, cut off tool with a 4" metal wheel. It was done in 10 minutes.
I vote for the service panel cutout, just in case you get the fuel pump in and you still have problems, you're only 20 minutes from having it out again.

 

[sssteck]

Wanted to update so others could more easily resolve their issue if it's the same...

The main issue with my truck ended up being the 4 wire plug in the left rear corner that controlled power to the pump itself. Water had entered through a rust hole in the front corner of left rear quarter panel. The 4 wire plug sits on the bottom of that area and got hit with quite a bit of water during rain driving. The power wire had basically rusted apart and was causing the loss of power. I cut the plug out of the equation and made some nice, new, clean, connections. That resolved the lack of power to the fuel pump.

I replaced several parts in the fuel pump system while trying to resolve this problem. I feel like they were due to be replaced anyway, so not really a loss. But the amount of down time spent looking for what ended up being one bad connection is was upsets me.

A very simple thing that caused me some headache was when testing the wires at the pump itself, I forgot the pump hanger assembly becomes its own ground point when installed in the tank. Without it, if testing the lines for power, you won't see a voltage as the circuit isn't grounded. So I had resolved the problem at one point but was not sure I had done so as I didn't see 12 volts on the wire. I realized the lack of ground, put the fuel hanger back in place and connected the plug to the pump and got power. Simple but wanted to be sure others weren't duped by the same thing.

Super glad to have the truck up and running again. I was stuck driving my Diesel Dodge Ram which wasn't happy with being put back into daily service. It's old and likes to be used every so often with plenty of rest in between.

Cory

Hi Cory,

I am having similar issues with my 62. I have had other electrical issues and they were cleaned up by cleaning up the terminals. So I am trying to find that 4 wire plug that leads to the fuel tank. I crawled under my rig this afternoon but could not see any electrical plug. Can you describe where it actually is. Is it necessary to pull the tank to get to the plug, I hope not. I pulled the tank several years ago in order to swap out the pump. The pump was good and it ended up being a bad fusible link. I don't really want to pull the tank again if I don't need to.

Thanks for any help you can give locating the plug.

Cheers,

Scott

 

[billmc]

Hi Cory,

I am having similar issues with my 62. I have had other electrical issues and they were cleaned up by cleaning up the terminals. So I am trying to find that 4 wire plug that leads to the fuel tank. I crawled under my rig this afternoon but could not see any electrical plug. Can you describe where it actually is. Is it necessary to pull the tank to get to the plug, I hope not. I pulled the tank several years ago in order to swap out the pump. The pump was good and it ended up being a bad fusible link. I don't really want to pull the tank again if I don't need to.

Thanks for any help you can give locating the plug.

Cheers,

Scott

There's a fuel pump connector behind a panel over the DS rear wheel. It's prone to corrosion.