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  Leaky 6 gal Tempo tanks on my Montauk!

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Author Topic:   Leaky 6 gal Tempo tanks on my Montauk!
GuyNole posted 07-19-2002 10:48 AM ET (US)   Profile for GuyNole   Send Email to GuyNole  
Ideas on why my Tempo tanks sometimes leak around the fuel line fitting and best way to ensure it stops? This has happened twice. Once when trailering on a long hot trip and once when sitting in the hot sun in a slip. I had one pal tell me the only way they could leak is if pressure built up because the vent was not open. Is this true? Help, it has made me sick to see gas all over the back of my 2000 Montauk.
daverdla posted 07-19-2002 01:09 PM ET (US)     Profile for daverdla  Send Email to daverdla     
I had the old 6.5 gallon metal tanks. They would leak if not vented at the quick disconnect fitting at the tank.

Got rid of them and put in a used Pate 27. The Pate has a vented cap.


Bigshot posted 07-19-2002 01:24 PM ET (US)     Profile for Bigshot  Send Email to Bigshot     
ALWAYS leave the vent open, even if just a hair. The only time it should be closed is when it is in a car so fumes do not escape.
GuyNole posted 07-19-2002 02:24 PM ET (US)     Profile for GuyNole  Send Email to GuyNole     
Thanks, keep those ideas coming on how to make sure they don't leak. Is there a good way to test?

Oh yeah, ideas on how best to get the slight discoloration stain of the rear deck?

I know these are simple questions, but I really appreciate everyone experienced input. As you can no doubt tell, this is new to me.

whalerron posted 07-19-2002 05:12 PM ET (US)     Profile for whalerron  Send Email to whalerron     
I recently removed a fuel stain from the anti-skid portion of the deck. I sprinkled some Tide powdered laundry detergent on the spot and scrubbed it with a wet scrubbrush. After rinsing, the stain was completely gone.
ShrimpBurrito posted 07-20-2002 12:09 AM ET (US)     Profile for ShrimpBurrito  Send Email to ShrimpBurrito     
It's DEFINITELY not a good idea to leave the vent open if you keep the boat in your garage, or any other unvented space. If you had significant fuel vapors escape, once you flip the light switch, you're going to see how well Whalers perform as lunar cruisers.
EddieS posted 07-20-2002 03:36 AM ET (US)     Profile for EddieS  Send Email to EddieS     

If that were true every time you parked your car in the garage you would be running the same risk! All tanks need to be vented. If you are really concerned about it, keep the tanks full to reduce the air space in the tank. I liked your Lunar Cruiser comparison!


ShrimpBurrito posted 07-21-2002 03:25 AM ET (US)     Profile for ShrimpBurrito  Send Email to ShrimpBurrito     
Ed -

You're right in that car tanks are vented, but if you've got fuel fumes venting from your car gas tank into the garage, you've got problems. There have been major vehicle recalls for such problems. When removing the tank cap on hot days, you will notice you're relieving pressure in the tank. Thus, the "open slowly" warning on the cap so you don't get gas in your shorts.

All vehicles have some kind of evaporative control system to keep all those nasty unburned hydrocarbons contained. In most cases, they are vented from the tank into a charcoal canister (mine is under the hood) where they are absorbed. When you start up the engine, they are sucked out of the canister from the crankcase and burned off.

Preventing gas fumes from entering the atmosphere has become a major deal. In California (at least), all gas pumps are required to have a plastic hood over the nossle, preventing fumes from escaping. They all are absorbed by the charcoal.

andygere posted 07-22-2002 06:58 PM ET (US)     Profile for andygere  Send Email to andygere     
They leak because they are a poor design and a cheap substitute for metal or fiberglass tanks. (The plastic expands and contracts with heating and cooling, making it impossible to get a reliable seal on the fittings.)

The solution is to throw them away and get metal or fiberglass tanks. Sorry for the bad news.

Dick posted 07-22-2002 09:09 PM ET (US)     Profile for Dick  Send Email to Dick     

Is your leak between the hose fitting and the tank fitting? There are quality fittings and junk on the market. If there is a quality fitting on the hose and a cheap one on the tank they may not be sealing together, both fittings should be the same brand.

I have the 27 gallon Tempo in my Montauk and use the Sierra Chrysler fittings on the hose and tank. I have allways felt that the Chrysler fittings sealed better than any others. I also allways leave the tank vent open.

GuyNole posted 07-22-2002 09:58 PM ET (US)     Profile for GuyNole  Send Email to GuyNole     
The leak seems is coming from the tank fitting and the two times it has leaked the tank is not connected. I have two of these tanks.
Dick posted 07-22-2002 10:29 PM ET (US)     Profile for Dick  Send Email to Dick     

There is a spring loaded check valve in the tank fitting that should seal it closed untill the hose is plugged in, the pressure build up in the tank should also help to keep the check valve, a simple spring loaded ball bearing, closed. I don't think you have a problem with the tanks it sounds like the fittings.
Any tank , aluminum, plastic or Pate will have fuel expansion if the vent is closed in hot weather. As the fuel expands it will find an outlet to lessen the pressure, in your case I suspect fitting check valves are not sealing.

Keep your tank vents open and you may not have any more problems.
Below deck tanks on both outboard and inboard boats are vented with no way to close the vents.
Tank vents that can be closed were designed for portable fuel tanks so fuel didn't spill in you car while transporting the tank from the gas satation to the boat.
In the car/truck closed, in the boat open.

Should have asked earlier as to what configuration the fittings are Merc, OMC or other.

GuyNole posted 07-23-2002 08:48 AM ET (US)     Profile for GuyNole  Send Email to GuyNole     
The fittings are Merc that came with my 2001 75. The tank fittings are the standard quick connect that came with the Tempo tanks.
where2 posted 07-24-2002 01:10 PM ET (US)     Profile for where2  Send Email to where2     
Somebody refresh my memory here. Is this Tempo quick connect similar to the OMC/Yamaha style of quick connect with two pins (one through which fuel flows, and one that holds the connection on). If so, I never could get those things to not leak sitting at the dock. I finally changed out the tank end of the hose, and the tank connection to the Suzuki/Chrysler style which resemble a quick connect garden hose or air compressor hose. Prior to that, I always had weird little leaks staining the deck.
lhg posted 07-24-2002 02:39 PM ET (US)     Profile for lhg    
The old style Mercury aluminum (not plastic) bayonnet style fittings are among the best for tank end fittings, and can be used with any brand engine. They're pricey, large and clunky, but they don't leak.
Dick posted 07-24-2002 09:26 PM ET (US)     Profile for Dick  Send Email to Dick     

To the best of my knowledge the 2001 Montauks did not come from the factory with any tanks, they were dealer installed.
The Tempo tanks come with no fitting and the dealer installs the proper fitting for the motor. If the tanks say Mercury or Quicksilver they probably came with the boat.

Regardless of the brand go back to your dealer and make them fix the problem.

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