Petrol resistant adhesive /sealant

[Dougie SwanParticipant @dougieswan43463]

hi

Can anyone suggest an adhesive or sealant that is petrol proof that I can use to seal this dummy fuel filter to my latest engine

Thanks

Dougie

[Dougie SwanParticipant @dougieswan43463]

[Jeff DaymanParticipant @jeffdayman43397]

I have never found a sealant that will for certain and forever stand up to petrol. Certainly not one that will attach the glass bowl mechanically to the filter.

What would work nicely is a flat silicone gasket, held with the bowl onto the body by a wire "bail". Alternately a brass hoop with a screw would also be prototypical and reliable. These hoops are usually made with pivots to the body at the ends and the clamping screw in the middle. Just food for thought.

Both the wire type and metal strip type were widely used on motorcycles and tractors well into the 1950's.

It's definitely a good idea to be able to get the bowl off a fuel filter as they do get debris in them that needs to be cleaned out time to time.

Edited By Jeff Dayman on 14/01/2023 14:56:13

[Dougie SwanParticipant @dougieswan43463]

Hi Jeff and thanks for the reply

I intend to make the pivoting hoop to press the glass bowl onto the brass

I have some pretty thick ptfe strip that might work as a gasket

Dougie

[Anonymous]

Hylomar Blue is petrol, diesel, oils etc etc proof non setting gasket sealant. Been about for donkeys' years and does what it says on the tin.

[Jeff DaymanParticipant @jeffdayman43397]

If the PTFE is soft enough, it might seal OK Dougie. If it doesn't , I suggest some flat silicone sheet, 40-50 durometer, available at any gasket supplier or industrial drives firm.

[SillyOldDufferModerator @sillyoldduffer]

Real petrol is only needed if the dummy glass has a practical purpose such as proving petrol is reaching the engine. Otherwise, block the input to the glass and fill it with vinegar. Then bathroom sealant works and there's no fire hazard should the glass leak or get broken.

Dave

[Ian PParticipant @ianp]

If this is a dummy fuel filter then why does it need a seal?

If it does have to seal then a suitably sized O-ring would be fine (and act as a cushion between the glass and metal)

Ian P

[Ady1Participant @ady1]

pinkgrip

edit

but once you stick it on it might not come off

Edited By Ady1 on 14/01/2023 17:07:26

[Dougie SwanParticipant @dougieswan43463]

Thanks again for the replies

It is a dummy in the sense that it won't be used to clean the fuel, but it will serve to pass the fuel from the tank to the carb so it does have to be sealed

Regards

Dougie

Edited By Dougie Swan on 14/01/2023 17:15:39

[Kiwi BlokeParticipant @kiwibloke62605]

When I rebuilt a 2-stroke strimmer engine for a friend, I was faced with the problem of sealing the two halves of the crankcase. No official manual or other guidance could be found – Stihl like to keep these things secret, it appears. The conventional approach seemd to be RTV, but it's not good at standing up to petrol. Loctite 518 flange sealant appeared to be specified as being petrol-hardy, and all was well for some years until the strimmer was destroyed by its 'operator'.

[JasonBModerator @jasonb]

There are a few of the liquid gasket type materials that are said to be fuel proof, also heard people using JBWeld to hold model fuel tanks together without problems

[HopperParticipant @hopper]

I have used epoxy resin (the slow-setting variety) multiple times to repair motorcycle petrol tanks and to thinly coat motorcycle carburettor floats that are made of cork and gotten porous so started to sink. Seems to stand up to it OK. Silicone gasket sealer such as Silastic seems to do ok too. That would be my first thing I would try. Permatex and Loctite also offer silicone type gasket sealers specifically for fuel system use.

Edited By Hopper on 15/01/2023 08:09:06

Edited By Hopper on 15/01/2023 08:10:26

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