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Author Topic:   Montauk Fuel Tank Mat Replacement
whalerajm posted 01-05-2004 05:06 PM ET (US)   Profile for whalerajm   Send Email to whalerajm  
I'm replacing my two 6-gallon tanks with 2 Tempo Ultra PBW-13-gallon tanks and anticipate replacing the original tank mats on my 1975 Montauk.

Any recommendations on material to use for tank mats?

Also, is there any need to fasten mats down the way they were from factory, with pop rivits? I was thinking any thick plactic or foam material would work since the weight of tanks and pressure from tie downs alone would hold mats in place.

Buzzorouter posted 01-05-2004 07:36 PM ET (US)     Profile for Buzzorouter  Send Email to Buzzorouter     
Whalerajm-
Are those tanks plastic? If so -do you need mats? I would think that the original Aluminum Tanks required mats to keep the deck from getting stained by corrosion on the metal tanks and scuffing as well. I put a 19 gallon single plastic Tempo under the seat on my Montauk. I did use cooler corners on the tank and a hold down strap, but the majority of the tank sits on the deck.
whalerajm posted 01-05-2004 08:32 PM ET (US)     Profile for whalerajm  Send Email to whalerajm     
Buzz,

Yes, plastic fuel cans. I agree, primary purpose of mats was to protect deck from metal fuel cans. I was hoping to use mats to prevent tanks from sliding (and also hiding 30 years of "crud" that built up under the mats and that I can't seem to get cleaned off the deck). Also rigging up hold down straps of some kind which will be screwed into RPS risers I made out of Trex.

Thanks

jimh posted 01-05-2004 09:04 PM ET (US)     Profile for jimh  Send Email to jimh     
[Administrative post]
whalerron posted 01-05-2004 10:47 PM ET (US)     Profile for whalerron  Send Email to whalerron     
If you didn't know, those mats are still available as new items.

- ron

adaco posted 01-06-2004 03:06 AM ET (US)     Profile for adaco  Send Email to adaco     
Whalerajm: When I put the two Tempo PBW 13 tanks under my RPS, I made a "mat" for them from Dridek squares, trimmed to fit. I also strapped the tanks to the RPS legs. The Dridek prevents scuffing when I slide the tanks out for filling and is easy to hose clean. I'm not wild about the straps, but if I find a better undertank idea, I don't have any screw or rivet holes to deal with. adaco
whalerajm posted 01-06-2004 10:20 AM ET (US)     Profile for whalerajm  Send Email to whalerajm     
adaco,

I will look into Dridek...where do you get it? Is it available in 1/4 inch thickness?

I have to admit, with plastic cans the mat material I use is 75% cosmetic...Hold downs set up can be done without screwing or riveting into deck as I have 2.5" of trex under RPS legs which I can use to rig up something...or continue to use bungees to the RPS legs.

Thanks!

adaco posted 01-06-2004 03:48 PM ET (US)     Profile for adaco  Send Email to adaco     
whalerajm: Dridek is available at West Marine and I am sure will also be stocked by most of the larger marine outlets. Without disturbing my tarp and snow covered Whaler to actually measure, I would guess Dridek is slightly thicker than 1/4". But my PBW tanks still fit under the RPS, which has not been raised. You might need those elusive low profile gas caps though (many Walmarts stock them). adaco
whalerajm posted 01-06-2004 04:23 PM ET (US)     Profile for whalerajm  Send Email to whalerajm     
adaco,

Thanks. I'm really jealous of you Montauk owners with 14-15 inches of vertical clearance under RPS. My 1975 aluminum leg RPS has only 12-12.5 inches...soon will have another 2.5 inches when I install the new risers.

What year is your Montauk that you had no height issues with the Ultar PBW 13's? How much vertical clearance do you have?

adaco posted 01-06-2004 06:16 PM ET (US)     Profile for adaco  Send Email to adaco     
whalerajm:

My hull is a 1989. I don't have the exact height of the bottom of the seat above the cockpit deck, but with the PBW tanks sitting on the Dridek, the top of the fuel cap vent still makes it under the seat (barely) when the vent is open. In fact, when sliding the starboard tank in and out for fueling, it must be moved a little to the left to clear part of the seat base.

adaco

simonmeridew posted 01-06-2004 07:00 PM ET (US)     Profile for simonmeridew  Send Email to simonmeridew     
I think you could go to an auto parts store or WalMart and get a couple of rubber floor mats and cut them to fit. If you pick the right one you might even get one with "lips" on each side to hold the tank from sliding around in rough water.
simonmeridew
triblet posted 01-07-2004 05:59 PM ET (US)     Profile for triblet  Send Email to triblet     
I just measured some, and DriDek is just a smidge more than
one half inch thick.


Chuck

TightPenny posted 01-09-2004 12:04 PM ET (US)     Profile for TightPenny  Send Email to TightPenny     
The Dri-Deck fits nicely in the stock rubber mats, and essentially makes the tank area flat.

It worked very nicely on my Montauk to allow the 28 gallon Tempo to fit without having point loadings on the bottom of the tank.

A J Bur posted 01-18-2004 06:14 PM ET (US)     Profile for A J Bur  Send Email to A J Bur     
Mine is a 1981 Montauk. I want to replace the origional metal tanks with 2-Tempo 13 gallon Ultra PBW tanks. The issue, of course, is vertical clearance under the RPS which has not been raised. I have about 13 1/2 to 3/4 " from the origional rubber mat to the supports under the RPS.The Tempo web page shows 15" H with gas cap. The 5 is blurred. It might be a 3 or 13"H. What does yours measure? Did you get one of those low profile gas caps from Walmart? Did you need to put an extension on the fuel outlet fitting to easily change the fuel connection between tanks? Any help would be appreciated.

AJ

whalerajm posted 01-19-2004 09:35 AM ET (US)     Profile for whalerajm  Send Email to whalerajm     
AJ

The Tempo Ultra PBW is 15 inches high (20 x 14). Tempo has a new low profile cap that will be available Feb 2004, which is supposed to be about 1 inch lower (Part # 060100, Model # 100CDS).

I installed 2.5 inch risers under the RPS legs and I still only have 1/2 inch clearance from lowest point of RPS (1975).

My fuel line was long enough as is...not an issue.

The Ultra PBW don't fit into the old mats...but I don't think they are necessary for plastic tanks. Since the tanks are over 20 inches long, they extend well beyond RPS legs and are difficult to strap to RPS. Tempo and other after market tank tie down kits are worthless in my opinion as they are just wood blocks or footmen that need to be screwed into the deck (and you will need 4 per tank with 2 screws per for a total of 16 new holes in your deck...

Two alternative tank hold down options to consider:

1. If you make risers to raise the RPS, cut them the length of the tank...then you can mount your hold downs into the risers instead of the deck (Unfortunatley I made my risers before I got my tanks and didn't think of this until it was too late).
2. The Ultra PBW has molded insets for handles, fore and aft that about 1.5 inches deep and about 4 inches wide on bottom/sides. I'm planning to cut blocks out of Trex that will fit this inset and mount them to the deck...the tanks will slide in and be held in place by the bocks preventing side to side and forward/backward movement so long as they are held down...I plan to hold them down with bungees running back over top of tank, hooked into eye straps on each block.

A J Bur posted 01-30-2004 12:33 PM ET (US)     Profile for A J Bur  Send Email to A J Bur     
Finally ended up going with Tempo C2814 27 gallon, $195, with low profile cap, $6, off of a riding mower and $5 straps from ACE. Tank itself 13"H, 16" with cap and about 14 1/2" with low profile cap with vent open. With origional rubber mats + $6 door mat cut to fit inside rubber mats, there is 1/16th" clearance under the support bars under the seat. The cap, gague and fuel connection are along a long demension edge, which is positioned aft where there is 14 1/2" clearance, easy fuel connection and only needs to be pulled out 4" for siphon, $3.80 at Ace, refueling. I tied, clove hitch, the straps to the forward support bar and used the 1" depression the circumferance of the tank on both sides to secure it aft with buckles provided to allow for slacking off to slide out to refuel. Looks good. Now the sea trial. I'll report any problems.
A J Bur posted 02-28-2004 12:36 PM ET (US)     Profile for A J Bur  Send Email to A J Bur     
Have run 10 hours with 27 gal tank and all is well.

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