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Thread: Plastic Gas Tank. (Thoughts?) Reply to Thread
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  Topic Review (Newest First)
01-07-2020 03:50 PM
macdj250 I believe Harley v-rod uses a plastic tank.
It has a sheet metal cover over the engine where a standard tank sits.
The tank itself is relocated under the seat, plastic molded to fit the tight spaces. It’s protected by frame, but has passed Harley and dot safety standards. And I like the idea of new availability to meat demands. As well as no rust regardless of how long it sits.
This vn is now my 7th build. And I always dread the tank battle.
New tanks, restored tanks. Custom, etc. rust removal. Parts to fit. Etc.
but price point would make a new production plastic tank worth worlds to me.
Especially with availability of multiple styles and designs.
11-13-2019 02:31 PM
DACataldo
Quote:
Originally Posted by TonyO View Post
MY ten cents

....... how about one with an extra gallon in it?
Absolutely!!! So..... I am not the only one caught in no-man's-land with a tank running dry!
11-12-2019 08:40 PM
dljsr Keep working on it. Add a gallon or more and I would be interested. What color plastic are you planning to use?
11-08-2019 04:02 PM
VN750Rider/Jerry I think to make it bigger the best way is to make it wider. If you change the side profile it will change the lines of the bike. Unless you are going for a Mad Max look. I carry an extra gallon in 1 qt bottles if I have any doubts about running out. My first 2 Vulcans would go on reserve at around 120 miles. But since it has tubeless tires, I don't have to lug around all the stuff you would need to repair a flat tube type tire. I have saddlebags, a T bag, a tank bag, and have room on the passenger part of the seat for another large bag, which also provides back support. I have always been "mission specific" I carry what I think I will need on a specific trip.
11-08-2019 02:34 AM
Will750 I plan on keeping this thread up to date as i go along. It sure is gonna be a fun one. The beauty of it is that once the mould is desiged and made 🤞 all the fittings like for the petcock or fuel level fitting are added afterwards. My thinking on this so far is.. petcock fittings, fuel level fitting(optional) when i say optional i mean the fittings for the screws will be there but no hole for the actual thing itself. The hole can be drilled by the person themselves if they choose to use it. Gas cap will be moulded into the tank. I was also thinking of having fittings in place for the option to add an auxillary tank if one so desiers. This would give the person the option of having an extra gallon tank stashed somewhere else on the bike. This would also have the fittings in place but need to be drilled out also. That is my thinking so far on it.
11-07-2019 06:22 PM
Spockster
Quote:
Originally Posted by Will750 View Post
I have been checking for ways with my own tank already today to see where i could squeeze the extra from. I think i can get it to 18 litres which would be 4.7 gallons. Any more and it would just look to big. This is gonna be an interesting project thats for sure.
Document your progress, you can put up a web page or use it on your resume'.

4.7 gal would get me 207 miles. As it is now, I need a fuel stop to get back from the farm, and there's not much out there. They close early too.

Ethanol - I've seen rubber fuel lines 6ft long disintegrate along the entire length in about a minute, rotted from the inside out. Haven't seen modern plastic tanks fall apart.

Think I've seen whisky in plastic bottles, like 1/2 gal or so. Haven't looked in a long while.
11-07-2019 04:06 PM
ubertalldude Ethanol is a spooky fellow. I always fill mine up with ethanol-free if I'm not going to immediately burn it off on a road trip.

As for the tank, this project seems like a lot of fun! A small production run of a greater-capacity tank is the kind of crowdsourcing project I love seeing on forums like this (if it comes to fruition, no sweats one way or the other)
11-07-2019 03:56 PM
VN750Rider/Jerry
Quote:
Originally Posted by Spockster View Post
I tried looking at female threaded caps, as on dirtbikes, but there's just so many. Male threads on the tank means you don't need a bung insert, just mold the threads on the top of the tank. If the threads are just the right height, I don't think it would look too bad. I suppose you could mold female threads on the tank as well though?

Jerry, what year is the XT? Plastic tech has come a long way since then, and maybe ethanol wasn't even in widespread use then?

My XT225 is a 2001. It is the one with the aftermarket Clarke tank on it, which has held up so far. The two oem tanks ruined by ethanol were on a 1999 XR200 and a 2002 XR250. It happened about 7 years ago. It had already destroyed the petcock on the 200, and Honda petcocks cannot be rebuilt like the ones on the Vulcan 750. They are riveted together. They cost about $60. I drilled out the rivets, fabricated a metal cover plate for the front, and put it back together with screws and nuts. It was no longer a petcock, just a fitting. I pulled the hose to the carb off when it was stored, and replaced it with a short piece of hose with a small bolt stuck in it. Dirt bikes also have a vent hose attached directly to the center of the gas cap, and stuck down behind the handlebar somewhere (or at least they did) The open ends of these hoses would just turn to mush (including the one on my XT225)But on the two bike wit the destroyed tanks, I pulled the hoses off the cap and blew through them. They were swollen, but not blocked.

I have also had damage done to petcocks and carb parts on other bikes by ethanol. I've rebuilt VN750 petcocks 5-6 times. I had to replace the coasting enricher diaphragms on the 2002. They were completely melted. Just black goo. I also noticed the end of the carb float bowl vent hose (the one that plugs into the right side air filter housing, which I still have) becomes swollen and mushy just like on the dirt bikes.

I think there is a reason they put whiskey in glass bottles. It would melt plastic bottles.
11-07-2019 02:36 PM
Will750
Quote:
Originally Posted by Spockster View Post
Quote:
Originally Posted by Will750 View Post
Yes we can do the female threads also but my only concern with that would be stripping out. We have a variety of brass fittings to be moulded so i will have a look and see what would suit
I've never seen any strip out, the threads are really coarse. Maybe 3 threads per inch? But you know better than I about your options and costs. I think the ones with the insert, as you showed, look better than an MX cap sitting above the tank, and some of those had locks I believe.

Looks like a good project, if it succeeds you can branch out into other makes and models. If I still had the crashed tank on the bike, I'd be in line to check out one of yours.

One good thing, the tank will be a lot lighter in weight. Better, lower center of gravity, and lower shipping cost.

In making more capacity, you might check clearance between the tank and frame, see if that can be squeezed? A little here, a little there, bam, a gallon and a half.
I have been checking for ways with my own tank already today to see where i could squeeze the extra from. I think i can get it to 18 litres which would be 4.7 gallons. Any more and it would just look to big. This is gonna be an interesting project thats for sure.
11-07-2019 11:49 AM
Spockster
Quote:
Originally Posted by Will750 View Post
Yes we can do the female threads also but my only concern with that would be stripping out. We have a variety of brass fittings to be moulded so i will have a look and see what would suit
I've never seen any strip out, the threads are really coarse. Maybe 3 threads per inch? But you know better than I about your options and costs. I think the ones with the insert, as you showed, look better than an MX cap sitting above the tank, and some of those had locks I believe.

Looks like a good project, if it succeeds you can branch out into other makes and models. If I still had the crashed tank on the bike, I'd be in line to check out one of yours.

One good thing, the tank will be a lot lighter in weight. Better, lower center of gravity, and lower shipping cost.

In making more capacity, you might check clearance between the tank and frame, see if that can be squeezed? A little here, a little there, bam, a gallon and a half.
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