98' cranks but wont start, fuel pump not recieving power.

[TheDurk]

Just to update everyone on this thread and give a solution to my headache of a problem:

Turns out it was my fuel pump ground all along. I found I had 12v while cranking at the fuel pump, so i decided to cut the ground wire of the fuel pump and temporarily ground it to the bottom seat bolt nearby and she fired right up :dancin:

Guess I have a bad ground somewhere, but weirdly I don't have any other electrical issues. I check the ground for the fuel/injector rail on the plenum with my impact (yes, I know I shouldn't have but I did) and the bolt broke so i grounded it to the diagnostic port bolt and I imagine that would all well and good.

I'll keep the fuel pump ground to rear seat bottom bolt until I get back there again and do my fuel pump kill switch.

Thanks for all the quick feedback on here guys, really appreciate it.

So how do we explain that the pump ran when you hot wired 12V+ to the fuel pump? Was there something you didn't tell us?

The pump grounds to Ground Point IE in the driver cowl. That is a major point so fault is not the point itself, but the white/black wire that carries it or one of the three connectors through which it passes (one on the floorboard, one in the kick panel, and one in the cowl).

 

[McStudRunner]

So how do we explain that the pump ran when you hot wired 12V+ to the fuel pump? Was there something you didn't tell us?

The pump grounds to Ground Point IE in the driver cowl. That is a major point so fault is not the point itself, but the white/black wire that carries it or one of the three connectors through which it passes (one on the floorboard, one in the kick panel, and one in the cowl).

Sweet thanks Durk, I'll take a look.

I did supply a ground and 12V directly to the pump, so thats why I never knew the ground meant for the pump was bad.

 

[TheDurk]

Sweet thanks Durk, I'll take a look.

I did supply a ground and 12V directly to the pump, so thats why I never knew the ground meant for the pump was bad.

Ahhh, you didn't mention you supplied ground, too.

I hooked up 12V directly to the pump and cranked the engine over and it started right up with no hesitation.

 

[IBallEngineer]

Sweet thanks Durk, I'll take a look.

I did supply a ground and 12V directly to the pump, so thats why I never knew the ground meant for the pump was bad.

Oh, just a HUGE and very important point!

:uzi:

 

[mhelvestine]

Fuel Issues 1997 Four Runner

Had a problem like yours, one day went out the engine wouldn't start just cranked, went out of town couple of days later tried and started right up. Drove over 1,000 miles for the week, came out of Walmart wouldn't start but cranked. Towed home.... Next day checked all the fuses, all checked out ok, checked the fuel pump relay it too was good. Pulled the pump from the tank, benched tested the pump with 12v and nothing. Replaced the pump it only had 411000 miles on it. lol Installed the new pump and still wouldn't start but will crank. Pulled the plug off the tank and checked what voltage I had there, with the key on , nothing, but go to start and I had voltage not 12.4 but 10.5. kinda looking like a ground issue too. Will check out this morning.