Fuel Trap

[cmec]

Help needed. When replacing the dizzy on my 1098 engine the vacuum pipe connection is push fit on the new one where on the original it was screwed. The pipe and the fuel trap is in poor condition and needs to be replaced. Do I fit a plastic one without a trap at about £3 or a metal one with trap for £23. Thanks.

[bmcecosse]

No need for the trap....

[beero]

Unless you want it to look totally original under the bonnet go for the plastic pipe. Works just as well and as BMC says........

[JOWETTJAVELIN]

Hang on chaps, the end fittings for each type are different - the metal pipe has screw terminals for the carb. and distributor, whilst the plastic one pushes on.

What precisely do you mean by poor condition? Cosmetic or something actually affecting the function??

[smithskids]

you can use a screwed old one witha stub of pipe and a rubber sleeve then push the plastic one on to the screwed pipe stub, it works in an emergency.
Regards smithskids.

[cmec]

Thanks for all the advice.
Poor condition means that its nearly rusted away. As the new dizzy and the carb have push on then its the plastic one for me. Saved me nearly £20 great.

[mike.perry]

The plastic pipe works well until the petrol fumes from the carb work their way up the vacuum pipe to the distributor and ignite when the points spark, destroying the distributor.
Don't worry its a rare occurance, has only happened to me once!

[bmcecosse]

Many millions of A series were fitted with just the plastic pipe...... I suppose if the diaphragm in the dizzy advance is ruptured there is a faint chance of petrol gaining access to the dizzy - but really - the suction flow is the other way - towards the carb !!

[rayofleamington]

the suction flow is the other way - towards the carb !!

only if your diaphragm has already failed!!

Otherwise it'll suck back every time you put your foot on the throttle
The risk of this is that over many years you can fill up the diphragm area with fuel that condenses onto the surfaces. pretty negligible risk though, as already stated.

[bmcecosse]

Aye -but the problem was stated as petrol in the dizzy - which can't happen if the dizzy diaphragm is ok.