Description
I had my boubts when an engineer made me a flange for my fuel pump, that the "O" ring groove was too deep.
Well it leaks (very slowly), so I want to know what sealant I could use that will stop it bearing in mind that it is in the bottom of the tank.
I was thinking along the lines of Blue Hylomar?
I used Red Hermitite with no problems.
The trouble with red is that it doesn't like petrol and will harden and leak.
could you pack up the seal from the bottom of the groove,with say ptfe tape.
just had another thought,machine the flange face down,thus reducing the groove depth.
petro patch? which is basically a fibreglass type resin, or simply fibreglass resin???
Will obviously harden but assuming you're not taking the pump out every 5 mins does it matter?
Can you not source a deeper ring?
quote:
Originally posted by westf27
just had another thought,machine the flange face down,thus reducing the groove depth.
petrol resistant rubber gasket? Premier fuel systems should be able to help.
did the flange warp whent it was welded in?
Paul
I'd go for some blue. Otherwise you could make a cork gasket to sit between the sender and the tank.... Fuel proof and rather maleable...
Martin there are masses of different O rings available. There will be one which will do the job and it's far better than bodging with goo.
I'll find you a supplier.
Here you go. I don't buy from these peeps but they've got a good site showing all the different metric and BS rings.
Linky
[Edited on 2/3/09 by MikeCapon]
Edited again to add. You want to aim for 25-30% compression of the O ring for a good reliable dynamic seal.
[Edited on 2/3/09 by MikeCapon]
Mike I'll take it out and have a measure and try your people first. If they don't have one, then it is the blue goo!
quote:
Originally posted by skippad
I used Red Hermitite with no problems.
quote:
Originally posted by 02GF74
PEEPS - PLEASE READ THE TUBE!.
blue stuff stays not resistant to petrol whereas the red is.
I've got the blue and the red stuff and have used both to seal senders. I found the blue stuff went soft whereas as far as I know the red stuff is still fine. (i.e. I am not aware of leaks).
Red goes hard and peels off. Blue stays soft to maintain the join.
quote:
Originally posted by AdamR
quote:
Originally posted by 02GF74
PEEPS - PLEASE READ THE TUBE!.
blue stuff stays not resistant to petrol whereas the red is.
I've got the blue and the red stuff and have used both to seal senders. I found the blue stuff went soft whereas as far as I know the red stuff is still fine. (i.e. I am not aware of leaks).
Sure you've got that the right way around? The Blue Hylomar I've got definitely says it's fuel resistant on the packet - even suitable for sealing injectors apparently.
Blue Hylomar link
no photo, but did look at the packaets.
blue stuff states fuel resistant (one assumes to be petrol but may be just deiesel, unlikley though).
red stuff states petrol resistant.
I used blue to seal a leak under my fuel sender plate. Was fine for over a year while I had the car and as far as I know still is. HTH.
[Edited on 3/3/09 by Jubal]
Update, bought O ring. They come in standard sizes so I could only get one 0.3mm thicker!
No good, still leaks.
Tried the blue goo.....still leaks!
Is it worth making a paper gasket (plus blue goo) ?
i had a fuel tank made with an inspection / access plate in the top. went to a local gasket maker for advice to seal it. he told me the ONLY way to
seal it properly was to use a nitrile rubber seal - the plate had to also have very close bolts to stop plate bending.. and use the sheet in one piece
rather than a strip right round. now your is a different application but i'm guessing its the problem of 2 or 3 things
1. your not using a totally petrol resistant sealant - nitrile IS the stuff
2. the surface its sealing between - is it actually touching the seal an both sides of the pieces together?
3. is there anything getting in the way? debris? splits? scratches? petrol WILL find a hole no matter how small
i tried alsorts of stuff to seal - thats the best
I am going to give it one more try tomorrow (I'm at work tonight) and if I can't get a seal, it is tank out and I'll get the blighter
who put the o ring groove in too deep, to mill the surface!
Here is a photo when the chassis was upside down and the damn thing was accessible!
[img][/img]
I've found another option. It would seem that O rings come in standard thickness dependant on the dia of the ring. So I can't get a much
thicker one, but they do cord which is basically a length of rubber (in this case because of petrol, NBR) that comes in any thickness. This can be cut
with a knife and the ends super glued to form a ring.
I'm going to try this before getting the tank out.
The problem with getting the tank out is that I have to remove a water pipe (drain down) and the handbrake cables just to get at it.
Finally sorted it!
I used 6.5mm cord to create an O ring (superglued at the ends) and the tank is currently holding 30 Litres of petrol without a hint of a leak! (I
built up the level over several hours).
I am just finding out how much it holds (expected 33 litres) for the virtual tank level of the Veypor VR2.