HS2 Gasket question

[Jamiet]

Hello
I am in the process of fixing a fouled up carb on my 1098 66 Moggy. I note most of the kits seem to include more than one of the gaskets that go between the carb and the inlet manifold? Anyone know why there are two identical gaskets?
Also while I am here I see there are some who object to the fitting of a fuel filter. Trying to understand why that may be a bad thing?
Thanks as always for any replies BTW happy new year!
Cheers
Jamie

[jagnut66]

Hi Jamie,
Without a picture of the gaskets in question I can only assume you are talking about the gaskets that go between the carb and the spacer block that packs it out, distancing it away from the exhaust / inlet manifold.
Basically: Carb, gasket, spacer block, gasket, manifold.
Are you missing this black coloured spacing block?

The usefulness of fuel filters between the pump and the carb has been disputed on here for ages, some people prefer to fit them, some people say they are a waste of time and money.
I've run Moggies with them and without them.
They will catch sediment before it gets to the carb but my thought would be that, if you want to fit one, surely it would be better to interrupt the feed before it reaches the fuel pump and therefore protect both.
Best wishes,
Mike.

[ianmack]

Added filtration is no bad thing in itself but they are sometimes affected by heat leading to vapourisation. If you want one fit as far from the manifold as practicable.

[Jamiet]

Thank you both very helpful indeed. I now see why the other gasket, i also have the spacer as discussed.
I am going to fit the filter on the inner wing so it will be as far as possible from the hot bits.
Cheers
Jamie

[myoldjalopy]

Fuel vapourisation has been mentioned by some as a strike against an in-line filter but opinions vary. I have never had a problem with one although, if the filter in the pump is sound (they sometimes split), then that should suffice in itself.

[JOWETTJAVELIN]

There is already a filter in the base of the pump, it's secured by a large hex head. On early cars there is a thimble shaped filter on the input to the float bowl. You will never need a fuel filter. If the petrol tank has rust inside it is finished.

[JOWETTJAVELIN]

Fuel vapourisation has been mentioned by some as a strike against an in-line filter but opinions vary. I have never had a problem with one although, if the filter in the pump is sound (they sometimes split), then that should suffice in itself.

Quite right, you beat me to it.

[kevin s]

In principle a fuel filter is a good idea, with irregular use many tanks will have a degree of corrosion from condensation while still being perfectly functional and it's not unheard of fuel to be contaminated or debris to enter through the filler neck.
There a a couple of problems though, if you fit a filter prior to the pump there is a good chance it won't work, the air in the filter acting like a resonator and preventing fuel from being drawn up. In theory it should work fine between the pump and carb but I have just had a problem with the carb flooding which seems to be due to the extra volume of fuel / air in the line so this doesen't seem perfect either, a better quality filter which doesen't trap air may have helped, I am planning on trying mallipassi filter king which also limits the pressure.
So I would conclude there is no definitive answer it will depend on the condition of your fuel system and how you use it.

[oliver90owner]

Anyone placing a relatively large volume of fuel which can gravitate to the carburettor is, frankly, asking for trouble.

Any filter will create a pressure drop. Reducing the design pressure at the carburettor is not likely to enhance the operation and may do the opposite.

Against that, some fuel pumps fitted may provide fuel at a different pressure. Common sense - taking all factors into consideration is good. Not everyone has that ability. If you haven’t, leave the system as designed unless you are prepared to make your own experimental trials and possible failures.

[Jamiet]

Well after stripping and rebuilding the carb and then fitting a glass fuel filter with gates hose from Car Builder Solutions all is now hunky dory. Don’t think I will be replacing the fuel tank just yet although It would be nice. Can highly recommend a tin of carb cleaner by the way. It’s the dogs danglies.