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Old 10 February 2003, 15:42   #1
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Spare Fuel Tanks and Connectors

Hi,

I wish to carry a couple of spare fuel tanks in my RIB. The supplier of the boat has suggested that breaking the fuel line to insert a connector, that would allow the connection of the spare tanks is a bad idea. This is because the 200HP engine could suck air from into connector and into the fuel stream.

Anybody have any experience in this area?

Cheers
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Old 10 February 2003, 15:50   #2
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Yep

You need a tap in the main supply to switch it off when the auxiliary is being used and a tap in the auxiliary supply to switch that off when the main tank is being used. Or use a change over tap/valve.
An alternative is to use a standard male/female connector in the fuel line. Just separate at the main connector and plug in the connector for the auxiliary tanks. If you use the male end for the engine, the other connector will automatically seal. This arrangement allows you to connect any auxiliary tank you wish in the future.
JW.
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Old 10 February 2003, 16:17   #3
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Have done exactly this - can't see how there is any risk of air getting to the engine either?

I used the old-style Merc. connectors because they are available as male and female inline versions and inserted the 'join' near the engine but before the prime-bulge so that i can prime either supply - underfloor tank or spare plastic type. I did look at a three-way fuel valve, but could not see any advantage, infact the loose end (ready to connect to spare fuel tanks) would infact be a disadvantage. The way it is now i stow the fuel line for the reserve tank(s) under the seat.
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Old 10 February 2003, 16:53   #4
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Andy,

I had a fuel line made up for the plastic tank that has the same engine-end connector as the under-deck tank line. The plastic tank sits in front of the consul with a long line (inc. primer bulb) that will reach the engine. Therefore if any damage occurs to the main fuel line downstream of the primer bulb I am still covered.

Is your supplier suggesting that you change over tanks with the engine still running - doesn't sound like a good idea to me; could end up with a big BANG
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Old 10 February 2003, 17:27   #5
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Quote:
Originally posted by Ribald
could end up with a big BANG
Why? I've done that before, just be quick and give the bulb a gentle squeze.

Is this something i should not be doing?

Daniel
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Old 10 February 2003, 18:45   #6
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I only mentioned this as I have noticed that when I change over the fuel lines there is always a slight seepage of fuel.

I don't like the idea of petrol fumes near a running engine what with possible stray sparks around but perhaps I am being overcautious.

I have seen two boats (albeit with inboards) burst into flame whilst the owner was playing with the fuel lines when the engine was running.
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Old 10 February 2003, 18:50   #7
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Been there, done that as they say.

Several years ago i had an old (1970's) Mercury Blue-Band 65hp which was a real pig to start at the best of times.

Having turned it over and over and over i was investigating the fuel line when the main battery cable burst into flames (had overheated due to being in constant use for 10 minutes) ARGH - jumped overboard very quickly! The boat survived and, with a newer Yamaha engine lasted several more years.

Still, we learn from things such as this - what have i learnt? Own a newer engine that'll start easier
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Old 11 February 2003, 07:25   #8
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I've put a separate, large, filter/water trap in the system and simply put two fuel leads into it, one out. No problems - even when only carrying one tank.
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Old 11 February 2003, 08:09   #9
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Hi

Go down to Aladins cave (at Burlsedon, Southampton) they do a great valve which has 3 in an one out and is a rotary system so only one input is connected at a time this can be mounted on the console and changed at any time even with the engine running.

Hope this helps

John
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Old 11 February 2003, 10:04   #10
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Tanks etc

I run my Evinrude 115 ficht on plastic tanks and use the same old Mercury connector , works fine .I took out the built in tank as it was so difficult to fill and i take the plastic tanks to the garage to fill .
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