fuel leak around filler cap

delicagirl

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hello - i appear to have lost the rubber washer which sits inside the filler (diesel) cap and so if i put in more than half a tank a little fuel dribbles out and is making a mess of the rear body work. Short of trying to source a new filler cap - a challenge in its own right with my van.... has anyone got any DIY brain wave ideas please to stop this leakage ? i do have a bag of neoprene bits from an old wetsuit, but its quite thick to try making a washer out of... many thanks
 
Could scissor up a seal from a redundant tyre inner tube.
Check after few fills just to make sure the seal isn't
deteriorating and likely to crumble into your tank.
 
Hi Collette.


I have some thin flat rubber I use for gaskets. If you need a piece send me a PM and I will put you some in the post or call in if you are nearby.

Wil
 
You could look at the temporary fuel filler caps, available from fuel stations, not to use but to see if a gasket from one of those would work?
 
Temporary fix look out for old jam jars, .....what would be the size of the washer you require.

Is there a vehicle scrap yard near you.

Alf
 
delicagirl said:
hello - i appear to have lost the rubber washer which sits inside the filler (diesel) cap and so if i put in more than half a tank a little fuel dribbles out and is making a mess of the rear body work. Short of trying to source a new filler cap - a challenge in its own right with my van.... has anyone got any DIY brain wave ideas please to stop this leakage ? i do have a bag of neoprene bits from an old wetsuit, but its quite thick to try making a washer out of... many thanks
Click to expand...

Its part of the mot if that's due soon, I read Wilhelm will get you some rubbers that you could carefully cut to shape.
 
My Delica can leak a little bit even with the washer - not helped by the fact the filler is not much higher than the tank, think its the modern additives in diesel that erode the rubber (A common problem with fuel pump seals).
Do you have a picture of your cap?
Dave.
 
Alf said:
Temporary fix look out for old jam jars, .....what would be the size of the washer you require.

Is there a vehicle scrap yard near you.

Alf
Click to expand...

sorry to have been so long coming back to everyone..... i have measured the diameter of the fuel pipe and its 7cms. There is a vehicle scrap yard near me but surely old rubber seals would be perished and not terribly effective?
 
If you measure the filler cap internal diameter and look at the marks left by the old, missing seal, then just buy something like these - they do a whole range of sizes.
Use nitrile to be diesel proof.
2MM THICK NITRILE NBR BLACK RUBBER WASHER ROUND RING SEAL 12MM TO 60MM OD 2 PACK | eBay

Dave.

PS mine is 54mm OD 34mm ID

Also need to ascertain whether yours is bayonet (1/4 turn) fitting or a screw on type. The one in fazerloz post is a screw on type.
 
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As mentioned in post 13, you need nitrile rubber to be fuel proof.

When I needed a diesel transfer pump for my boat, I had to source a pump with nitrile diaphragm and valves.
 
davep10000 said:
If you measure the filler cap internal diameter and look at the marks left by the old, missing seal, then just buy something like these - they do a whole range of sizes.
Use nitrile to be diesel proof.
2MM THICK NITRILE NBR BLACK RUBBER WASHER ROUND RING SEAL 12MM TO 60MM OD 2 PACK | eBay

Dave.

PS mine is 54mm OD 34mm ID

Also need to ascertain whether yours is bayonet (1/4 turn) fitting or a screw on type. The one in fazerloz post is a screw on type.
Click to expand...

Thanks Dave i measured the pipe diameter and it was 7. My there are 3 lugs on the top of the pipe and 3 matching notches on the filler cap which have to be lined up then i twist the cap and it turns a very tiny amount to hold it in place. There is a key but i dont lock it.


btw - i saw the "baby" version of my delica a couple of weeks ago - the lad was on his way from Rotherham to Cornwall for holiday. He got very excited to see "big brother" van !!!! i dont think i had ever seen one like it before it was well over 30 years old... and about 3-4 feet shorter than mine but superbly equipped (but not 4WD)
 
Polar Bear said:
Hi Collette.


I have some thin flat rubber I use for gaskets. If you need a piece send me a PM and I will put you some in the post or call in if you are nearby.

Wil
Click to expand...



just to update.... i finally got round to asking my new kind neighbour for help. he made a great gasket for the petrol cap yesterday using the sheet that polar bear sent me - and it fits nice and snug. i am away for the weekend in the van so that will be the testing time.

thank you everyone for the advice - as usual.
 
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