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Old 24 July 2012, 14:53   #11
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I've had it on my osprey... I put it down to overfilling then moving her, as the fuel rocked back and forth it squirted out. I had to get a pint glass and kitchen roll to stop my tubes getting coated.

I would imagine yours is a combination of storage angle and heat.. Maybe the vent pipe's a bit long and dips into the tank at that angle too ?... Although not sure of the exact set up in the tank
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Old 24 July 2012, 15:35   #12
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Not sure if this helps. It was a photo that hightower posted some time ago. Shows that my memory is not as good as I thought as the raised connection points are 1/3 from the back not the front.
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Old 24 July 2012, 17:08   #13
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Quote:
Originally Posted by Erin
Not sure if this helps. It was a photo that hightower posted some time ago. Shows that my memory is not as good as I thought as the raised connection points are 1/3 from the back not the front.
Hi Keith
Yes, thanks for re-posting the pic, it does confirm my suspicions. Shame there is no forward breather as most ribs will sit with a stern trim.

Looking at the pic im quite confident that thats what happened, a void has been created in the fwd part of the tank as the fuel has naturally ran aft sealing off the void from the breather.
As the tank has warmed up it has gradually pushed the fuel out of the tank.

I suppose its something that maybe other Vipermax owners should not necessarily worry about but be aware of anyway.

Thanks again guys for the help in confirming this.

Simon
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Old 24 July 2012, 19:12   #14
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Ah yes, that's a picture of my tank!

After nearly 5 years of ownership I had this exact thing happen only this year, when I brim the tank I usually use a fair bit before I recover for the day. This particular day I brimmed the tank but only used the RIB to cruise out to a local fishing mark, so used less than 20l. I recovered and put the RIB to bed, up the drive as usual.

We had a spot of warmer weather a couple of days later and guess what, fuel all over the floor of the console. When I stuck my head in to have a look I could see the fuel level in the clear breather hose, but instead of coming out the breather to exit outside the console the fuel had found a gap in an ill fitting breather hose and dibbled into the console. After I had soaked up the petrol with some rags I calculated that a good few liters had come out.

So it looks like a common problem that can be solved by either not storing the RIB with a full tank or lowering the front of the trailer so that the trapped air can vent. This latter solution obviously means that during storage rain will run towards that bow instead of coming out the elephants trunk.

Here's a couple of different views:
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Old 24 July 2012, 19:32   #15
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I've had problems with fuel getting into the underseat compartment on mine when it's full (single dive console with the tank outlet under the seat). It doesn't leak visibly but when the boat is left with the tank topped right off, it dumps a wee bit under the seat, maybe a couple of tablespoonfuls. I assume it's something to do with the breather too, but I can't figure out where it is escaping. Let the level drop a bit and the problem disappears, so I now just top it off to about 5L short. I guess it's a similar expansion problem and maybe the connection on the breather isn't tight but it's a bugger to get to so I haven't worried about it too much. Another job for the winter
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Old 25 July 2012, 06:08   #16
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I was having exactly the same problem. The filler is at the front of the tank, with the vent at the rear. Its now reconfigured with a remote filler in the console and the rear vent blocked off. The vent is braised into the brass filler fitting in the top of the tank. I can now fill with no problems and get no spit back through the vent.
Photos of before and after the console was moved. The filler was originally under the deck plate in the first photo.
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Old 04 August 2012, 04:53   #17
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Quote:
Originally Posted by Hightower View Post
So it looks like a common problem that can be solved by------lowering the front of the trailer so that the trapped air can vent. This latter solution obviously means that during storage rain will run towards that bow instead of coming out the elephants trunk.
Been away in Greece, so only just caught up with this thread. I have had the usual problem of fuel coming back up the breather when filling and a little when the boat gets really hot and the tank is full, but nothing on the scale described by Anchorhandler ---- but my boat is always stored bow down. So I guess Andy is right
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