fuel leak from filler

[iain reed]

hi all
i found as i was going down steep hills in the old 101 fuel was leaking out of the filler,
a one way value maybe the go any ideas ??? with the price of fuel and the danger of fire like to get this one solved just putting it out there

[101RRS]

Iain,

As discussed I suspect the baffling in your tank may not be the best and does not slow the the rush of fuel to the front of the tank when you go down hill - particularly as the filler is so far forward. As you have indicated some sort of one way valve in the long filler pipe (I think yours is reduced to about 2" dia) that allows fuel to flow in but not out might be the go - this might be a simple as a spring controlled flap.

Another alternative could be to run a rubber pipe from the filler hole in the actual tank to the rear wheel arch and put a filler there. That long pipe you currently have would not exist and the filler will always be higher than all sections of the tank even when going down steep hills.

Garry

[Lotz-A-Landies]

Iain

Is the rubber seal under the cap intact and making a good seal?

What about the overflow pipe, hoses intact without holes and clamps tight?

[iain reed]

sorry to say it is a bit more than that i wish it was that easy :(

[lardy]

I am not sure but I believe the answer you seek is to sell it to me W.A. is fairly flat thus solving the fuel escaping from the filler!!!
It's a burden but anything to help.
Kind Regards Andy

[iain reed]

nice try but no cigar

[101RRS]

Put a ping pong ball down the hole with a restrictor to stop it coming back out - that will stop the fuel coming out.

[Mick_Marsh]

Ian,
I would have to agree with Dianne on this one unless it's the breather vent. My rubber seals are both hard, cracked and crushed so I bought new ones.
If it's the breather, it might be easier to plug it (at least partially) to stop the fuel gushing or connecting a fuel filter on the end of a length of hose to the breather (filter inside the filler neck) to slow the rate of fuel through the breather.
You can test this is the case by temporarily plugging the breather the next time you descend the hill.

[101 Ron]

For those not in the in the know, Iains 101 has a non standard fuel tank mounted in the extreme rear of the vehicle as a gas tank is where the normal petrol tank was.
The petrol filler is in the standard position meaning there is a petrol filler pipe 3/4 the lenght of the vehicle at a alnost hozional plane.

[DODGE]

nice try but no cigar

I would have to agree with iain on this one lardy. dont want too many 101s here it will flood the market. :D

As the others have said it sounds like you need to fit a non return valve with having a filler pipe that long.;)
Cheers gaz

[101RRS]

For those not in the in the know, Iains 101 has a non standard fuel tank mounted in the extreme rear of the vehicle as a gas tank is where the normal petrol tank was.
The petrol filler is in the standard position meaning there is a petrol filler pipe 3/4 the length of the vehicle at a almost horizonal plane.

This is exactly the problem - having observed Iain's 101 coming down a steep hill and loosing litres of fuel on a steep decent the fuel filler is lower than the highest point of the tank (which was full). The leakage is a combination of the fuel sloshing back and forwards and the filler being a low point on steep descents.

I have the same issue with my standard setup when the tank is completely full but my rubber seal on the filler cap is not the best.

Iain also has a leak at the tank itself where the rubber filler pipe joins the tank - not sure whether the clamp needs tightening or if there is perished section. From a safety aspect this leak is more of an issue due hot exhausts etc.

The easiest fixes are to fix the leak under the vehicle and put a new seal on the filler cap so that fuel cannot run back out - however there will still be a bit of fuel sloshing back and forward.

Failing that some sort of none return valve might work. At the filler on Iain's 101 there is a mod that takes the filler dia from about the standard 3" down to 2" in the filler. I know a Jag E-Type filler will work well as it has a spring loaded flap inside it that allows fuel in but not out - but these are a bit hard to find.

Failing that, move the filler to the rear wheel arch but that will take a bit of work.

Good luck with it.

[iain reed]

cheers for that about to pull floor panels out and have a look wish me luck

[101RRS]

At least it does not leak on the flat - well not much anyway.

[Lotz-A-Landies]

Iain

It may be worthwhile checking the sender unit on your 101?

The fuel tank on my 1991 RRc was leaking when it was filled to the top. Turned out the problem was in the seal on the tank sender unit. The PO had tried to repair the unit and didn't seat it back properly. I bought a new sender unit to correct the guage error and it was fitted back properly this time and the tank no longer leaks, you also don't run out of petrol when the guage is sitting on 1/4. :o

We took the sender unit out of the 101 at the SME and it was merely a matter of removing the access cover panel above the tank, then the 6 screws. You would only need to check the screws plus the cork seal on the sender and that fuel pipe fittings are tight.

[iain reed]

well pulled it all apart , yes a breather hose was off , fixed , got a on way valve and put it in , so far so good , but the spring tension on valve to tight
bugger.. well back into it again soon will try to modify valve wish me luck

[iain reed]

result !!!! after much cussing and mucking around sorted, low pressure check value (tradelink plumbing ) hacksaw and hose clamps , fuel punp interal type had a leak around it as well Di was right (of course ) filled it to the top , the most costly part, all good :):):)

[101RRS]

But does it leak when parked down hill?

[iain reed]

no all good so far