Fuel leak from fuel pump

Hi,

My '96 5 lug Tacoma is dripping fuel from the flare fitting that connects the fuel pump to the fuel line. I know it is tight, I tightened it on the bench while the fuel pump was being replaced. Would some teflon tape meant for gasoline stop the leak? Or is there an O-ring in there that I missed when reassembling? Dont remember seeing one but maybe it was there?

Thanks

 

You have an inline and fuel tank pump?
Do you have a picture of the leak?

 

Its a in tank pump. Here is a pic. Its the flare fitting that connects to the fuel pump there.

 

Bump.

License2Ill, any ideas?

 

I would disconnect the line and take a good, hard look at each of the fittings. I've never seen a fitting like that have an o-ring, but I suppose it's possible. I suspect that the threads inside the fitting are boogered, possibly because whoever made the connection tightened it too much. I would certainly use some kind of gasoline-impervious tape when I reassembled that fitting.

 

Not familiar with Taco. pump. Lots of vehicles have o-rings.

You specifically remember a flare? Or was it maybe more like a air hose connection, having a spot for an o-ring?

Guess someone needs to find a parts diagram.

 

From whatI can gather there is no o ring in there. Your going to have to just inspect and see if the hose needs replacing or tightened more.

 

It's a conventional flair fitting, inspect it good. The "flair" does the sealing not the threads so Teflon tape will do nothing. On that line the transition from the steel fitting to the plastic hose/tube has been known to experience trauma in the tank lowering process.

 

Ok, will drop it down and inspect again. I put in a brand new fuel pump including the whole assembly, not just the pump. Tightened that fitting on the bench so I know its tight. Hopefully I dont have to swap fuel pump housings or buy a new line, I am not sure if I can even get a new line from Toyota.

 

You can, they are not cheap so be reasonably sure before surrendering your first born male child.

 

Just that that fitting isn't stock. And I'm betting the brass piece there isn't the correct corresponding part to mate up with the flare fitting of your pump.
I'm betting once you pull the tank and pull apart those two fittings you'll be able to quickly see why it's leaking.
When I was going hydronics we'd end up with a part once in a while that was propriety and long out of production. And it'd leak because the surfaces didn't "mate-up" properly.

 

Huh. So you are saying the flare coming off the pump housing might not be mating properly because its somehow different being an aftermarket part?? It seemed to screw in just fine, so hopefully I didnt booger up the threads on my hose. But the hex part was 19mm on the new vs 14mm on the old one. If I have to I still have that old pump housing that I can swap my new parts onto. Thanks, I hadnt really considered that possibility.

edit: FYI, it was a Spectra pump assembly off RockAuto I bought. IDK if that makes a difference with anything.

 

I'm talking about that brass fitting not your aftermarket pump. It looks old and strange.

NPT is NPT. It's the standard fitting. Theyll screw together fine. The mateing surface possibly not so much..

Where'd that piece come from?

 

Um, that is the factory flex fuel line that connects the pump to the hard line under the bed. You think I may have that line on backwards or something? Both sides have the same female fitting I think. But only one side is leaking.

 

Huh. Are you positive? If I saw that under a Toyota I'd be surprised.
Was your old pump oem? With the threaded outlet? Like your new one?

 

Dirty pool has a great point. If you lowered the tank instead of removing the bed thus stressing the line, there's a good chance that 22 yr. old rubber that has been exposed to fuel the whole time has a crack in it under the steel sheathing.

Heck, even touching it after all this time could crack it.

 

It very well could be just mismatched though given you said there was difference in nut size.

When I looked at the parts diagram, I think I saw a price of 63 bux.

 

That is what was used on 1st gens up till 2000 and something. Flair on each end. They run $50+ wholesale. Been there.

The "hose" part is a semi ridgid vinyl type tubing.

 

Interesting.

 

Yup, thats what was on it when I bought the truck. Old pump was OEM so far as I know, it was Denso still. Same threaded outlet and everything, just like the new one.

I did drop the tank, but I disconnected the line before dropping the tank.

Yikes!! Thats a pricey line there. Its probably gonna be a week or 2 before I can inspect it again sadly, wanted to do it yesterday or today but no lift was available at the shop. Hopefully it doesent need replacing.