I just installed a '65 Mustang tank in my Falcon. I used a Laurel Mountain kit that included the sender and gaskets. I followed this article: http://www.mustangmonthly.com/howto/mump_0606_ford_mustang_fuel_sending_unit/index.html When I fill the tank, gas comes out under the sender. No amount of fiddling with that gasket will get it to seal. Am I missing something? My car is stuck at my inlaws until this is sorted. -Dave
In the tri 5's some of the screws are so bad they leak. The rubber gaskets also leak. We have to use a cork rubber gaskets and sealer on the screws and the gaskets. My 2 cents
I would be checking to see it something is keeping it from seating as well. I would also take a close look at the screws.
double check to make sure the o-ring gasket is seated in the groove in the tank, sometimes they slip out when your assembly it. i always tack the o-ring to the tank with gaska-cinch first before installing the sending unit. can you get a new gasket? those o-ring things leak after awhile, had one randomly go out on my ranchero (with a mustang tank). also, make sure your leak isnt coming from where the pick up tube is brazed to the pickup housing, and also, another leak i've had on those tanks before was where the sending unit pass-through connector is for the wire, the gasket around that cracked & i had to get a new sending unit.
Does the ring go on tight needing a hammer and punch with a good whack? I had a similar problem with a different vehicle and had to slightly bend the tabs that puts pressure on the locking ring to keep it from leaking.
No screws in the Mustang tank. The float/sender is held in with a locking ring, and the gasket is sandwiched behind. I am interested in a sealer recommendation. -Dave
I've had my hands on quite a few of those over the years. Have found that the o-ring is usually the problem. The ones provided with new tanks fit better than the ones with the sending units, make sure the o-ring is tall enough to be in full contact and compress to both surfaces. The grease on the o-ring trick works good to keep it from twisting or bunching up. Your lock ring may not be pressing hard enough on the assembly. Contact the company you bought the sending unit from and ask them to send you a new o-ring and lock ring. Hope this helps. tnrotter
I put on 2 seals and had it apart about five times then I found out the cheap ass part wasnt soldered correctly and was dripping from one of the connections through the housing. Also the thing that make sit work better is putting grease on the gasket. It keeps it from rolling over and makes it all just slip right where it should be.
I know on mine it was real easy to go past the stops. The aftermarket stuff is cheap and isnt exactly to factory specs. I had to buy a new sending unit both were foreign made. The way mine was leaking it looked just like the seal wasnt installed right.
The lock ring doesn't look right. Whats the dark area at the "top" of the sender near the gold-yellow cad flange around 12-1 O'clock above the sender wire? ....is it the gasket showing through/pinched/rolled around or part of the sender showing from underneath? With the right parts and installation the 0-ring and lock ring systems do not need sealants nor should they be applied. You either have the wrong o-ring, wrong lock ring or some other mis-matched parts. The sender, gasket. lock ring are all for the Mustang tank, correct? If you really have to use a sealer then Permatex No.1 is OK and a company called Gasolia used to make a gasoline resistant sealer as well.
i agree on the lockring looking funny. could just be the pic though. personally, i've never had to use any sealant on these ford sending units. it should take some pretty firm tapping at all 3 tabs to fully seat.
Thats the aftermarket shit. I had the same setup you just gotta make sure the O ring is in the groove if it is you might have a bad soldered joint around the pipes. IM telling you I pulle dmy hair out with this same crap. Buy a few new O rings and grease it when installing. If it starts dripping its the sending unit.
Check that the O ring is in place. Mine leaked aswell but found that the O ring was out of place. A quick setting and leak free. Are you useing a cork type gasket? couse my aftermarket mustang tank/sending unit came with a O-ring.
Hammer and punch, actually. It's as far as the rises will allow it to rotate... I think. That's not a picture of my actual parts, that's from the Mustang article. They all came as a kit from Laurel Mountain Mustang parts. The kit included two rubber o-ring gaskets and a cork gasket for the filler neck. I wondered if I should stack the two o-ring gaskets. Yeah, I hate to do it, but no combination of parts seems to seal. Ahh, I've only been tapping on two of the three. Rubber gasket. It looks in place, I was holding it in with grease, per the article. No time to work today, going to NAIAS. I'll let you know what I determine. -Dave
Your pretty sure its leaking from the sending unit. Did you check the retainer ring that is part of the tank. In some of the repo. tanks they are crimp in. More then once I have found the leak there. I would fix it with PC7
You can't stack o-rings. Are they round O-rings or square (sometimes called "quad" rings). If I remember correctly the ones I've used were square.
The provided o-rings are square shouldered. I won't attempt to stack them, thanks for that advice, the presence of two in the kit had me confused. My dad (who was a Ford service manager in the 1970s) recommended a coating of sealant tonight. I am pretty sure it's leaking around the o-ring and not where the retaining ring is crimped into the tank. -Dave
if you bought it from laurel mountain mustang, i would have packed it up for you. there is a lock ring and o ring in the tank from the supplier. the sender also comes with an o ring. that is why there is two of them. you should only need 1 of them. if is still leaking, call us and we will make it right. kevin is the owner of the company, talk to him.
So far, so good, actually. It seems I got everything aligned and tapped down tight the last time (just before I posted this thread). I'm not sure if sitting for a week helped or not, but last night was the initial cruise and I haven't seen any leaks yet. Custom53, thanks for that. It's so nice to have purchased from a company I can trust. That makes me want to use you guys again in the future. -Dave
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