Swap: New fuel tank

[xpertski]

Just bought a new plastic fuel tank as part of boat renovation works, and it fits - just!

So I know which is the filling pipe connection (the big plastic one), the smaller plastic one I assume is a vent connection? The other two metal ones look like the connection to the engine - but why are there two of them?

Probably a silly question to ask but I’m sure ppl on here will know ...

Also is it easy to rotate the metal connectors that connect fuel to the engine? To give more room I’d prefer them pointing the other way ...

Thanks!!

[Chanchan168]

The filler is usually the 38mm or 50mm. The vent is circa 19mm and there’s usually only a single pick up, unless the tank has a built in reserve.

The only think it could be is a return for diesel. Sometimes called a leak off. I could be wrong but I’d say it was a return feed. Don’t ask me why, but there will be a load more experienced people on here that should be able to give you the answer

[xpertski]

That could be it actually, so large plastic is fill, small
Plastic is vent and because it’s for diesel or petrol there is a return valve on the fuel out connections which is why there is two - presumably I just block one off...

[GuyC]

Filler, vent, supply and return. The supply (to the engine) pipe will go to the bottom of the tank, the return pipe may not.

If I had to hazard a guess I'd say the fittings shouldn't be rotated. They may be sealed by the factory and if you break the seal, the fitting will leak - either fuel or fuel vapour.

Is the tank designed for petrol? I seem to recall idly browsing the Tek Tanks site and due to legislation, their selection of tanks for petrol was pretty limited.

[xpertski]

Thanks Guy, that makes sense. Should be ok without rotating the supply and return connections? Just about enough room.

You are right about the two tanks items. This tank was from
Jay Wolfe, they have a range of plastic tanks that they CE rate for both petrol and diesel. This is their 207 litre tank.

[GuyC]

[Chanchan168]

Judging by the pic from Jaywolf that you’ve got, I’d defo say it’s an outlet and return. The return will not go to the bottom of the tank so I’d just cap it off and use the feed.

To be able to see which one is which, you should be able to take out the fuel sender and see which one goes to the bottom.

[jeffstevens763@g]

My plastic 43 ltr has one pick up and one blanked off for a return if required duel fuel tank

[xpertski]

Originally Posted by jeffstevens763@g

My plastic 43 ltr has one pick up and one blanked off for a return if required duel fuel tank

Hi Jeff, just heckled with Jay Wolfe, yes same as yours. It doesn’t have a return pipe as was designed for petrol but the two engine guys pipe connections are for twin engine setup so just a case of blocking one off. The two plastic connections are fuel in and vent. All solved! [emoji106] thanks all!

[jeffstevens763@g]

Originally Posted by xpertski

Hi Jeff, just heckled with Jay Wolfe, yes same as yours. It doesn’t have a return pipe as was designed for petrol but the two engine guys pipe connections are for twin engine setup so just a case of blocking one off. The two plastic connections are fuel in and vent. All solved! [emoji106] thanks all!

spot on just for info below

Ron Hale Marine Ltd - Plastic Fuel Tank High Profile