Aviation Gasket Sealant

[UKPhilTR7]

I have some Aviation Gasket Sealant and a leak on my fuel pump. So I am thinning of using the Aviation Gasket Sealant on the fuel pump.

Has anyone used this sealant before?

Also, if I use the sealant, would I still need to use the gaskets, as I know I will need the spacer.

[Hasbeen]

Phil I have used Aviation Gasket Sealant on a number of things, & found it excellent. It seals well, & as it doesn't set hard, is fairly easy to clean off.

However my query is where is the leak. If it is between the block & the pump, you must have a problem that should be fixed.

I presume you realise that the thickness of gaskets &/or spacers between the block & the pump controls your fuel pressure. It is not just a matter of sealing the joint, but adjusting the fuel pressure when you do so. The generic pump sold in Oz has an arm too long for normal instillation, & comes with 2 phenolic spacers of about 1/8 & 1/4 inch thickness. You need one of these if using this pump on a 7, or any other engine they fit.

I have used these, with extra thickness by using gaskets of A4 paper, the backing cardboard from a writing pad, & from a Kellogg cornflakes packet at different times. None of these instillations ever leaked, & needed no sealant.

I have always replaced the bolts with studs, as I have found getting the second bolt in, with the steering column in the way, difficult. It would be easy to destroy what ever gasket you used while feeling around with that bolt.

Hope this helps.

Hasbeen

[Cobber]

I agree with Hasbeen, about spacing the pump to control the pressure and about replacing the fuel pump bolts with studs, as well as everything else!

[dursleyman]

I agree with Hasbeen, about spacing the pump to control the pressure and about replacing the fuel pump bolts with studs, as well as everything else!

You Aussies all stick together!

[UKPhilTR7]

You Aussies all stick together!

Lol sounds good to me. May not be there now but miss the place.

Glad to hear that the gasket seal is a good one, I have been thinking of using it for a bit now as I think it was Cobber who originally suggested using it on my oil pump leak.

I am assuming that it can take the heat of the engine?

Sure did know about the spacers depending on the size of the arm on the pump. Not sure if the thinner gaskets are also used on the spacer for the fuel pressure though? I cannot remember the size arm on mine at the moment as been so long since I have taken it off, but there is the spacer there so would assume it is the longer arm.

Oh yes for sure I have a few studs and going to replace the bolts

[Hasbeen]

If you have no flooding, or fuel starvation problems, just reuse what is there, with new gaskets either side.

Yes Cobber can be useful at times, with his recommendations. He is the one who suggested the Honda S2000 to me, when I couldn't find a modern I liked enough to buy.

Hasbeen

[UKPhilTR7]

I just don't get what the 2 paper gaskets are for, are they for adding more thickness (or reducing it) to get the fuel pressure correct?

[Cobber]

you put one each side of the spacer block to seal it

[Beans]

In case the spacer block is needed.
Mechanical pumps sold these days don't need the spacer.

[UKPhilTR7]

So Cobber if that is the case then as i am using the gasket sealant i do not need the two gaskets either side of the spacer.

[Cobber]

The gaskets may be required as part of the required spacing, the gasket sealer will squeeze to a thin film, much thinner than he gasket.
I'd fit the gaskets dry, then test for the appropriate fuel pressure, if happy then, reassemble with a thin smear of gasket sealer on both sides of both gaskets.
If the pressure is not correct than add or delete gaskets as required, test again, then once happy reassemble using sealant.

[Hasbeen]

Beans that may be the case in Europe, but until very recently those available in Oz were a generic pump, with an arm too long for the Tr7 motor. If Phil bought his pump while in Oz it will be one of those.

Don't forget we little folk in the colonies are not as well supported as most in the northern hemisphere.

Hasbeen.

[Beans]

Two TR7 pumps on the outside, and replacement in the middle:

[dursleyman]

I had a replacement like the middle one, it leaked fuel from the top and would not seal. Very poor quality.

[Beans]

That one was fitted to the DHC. I replaced it because I thought it was leaking through the diaphragm.
But after taking it apart it turned out to be just fine. So now acts as spare on longer trips.