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Re: HS4 Flooding problem

To: "Jason" <>,
Subject: Re: HS4 Flooding problem
From: Max Heim <>
Date: Sat, 8 May 1999 12:40:23 -0700
I have been using this precise combination for 8-10 years with no 
problems. I am assuming that since you recently rebuilt them that you 
have the newer type floats with rigid nylon arms, that are adjusted with 
washers (as you said). The height spec is the same as original. If you 
don't have the manual for the earlier cars you can find it on the 
websites that deal with SUs. I seem to recall it's something like 1/8th 
inch from the rim of the bowl to the bottom of the arm (you slip a 1/8 
drill bit into the gap). I believe I have one washer on mine to achieve 
this height, but I haven't been in there for years. 

I think one of the advantages of Grose-Jets is that they are less prone 
to flooding, as they are less likely to become jammed open with crud. So 
I would guess you have adjusted the floats too high, or have some other 
problem (too high fuel pressure? do you have an aftermarket pump?). Do 
your floats actually float? Test them in a bucket of gas (not water -- if 
they are full of fuel they will float in water).

Good luck.

Jason had this to say:

>I recently installed a set of HS4 carbs (AUD 135) on my 79 B. I am having
>problems with them flooding (badly!). When I rebuilt them I used Gross Jets,
>and I suspect they are causing the problem.
>Has anyone used Gross Jets on HS4s? If so, what did you set you float height
>to? Also, how many washers did you use under them?


Max Heim
'66 MGB GHN3L76149
Runs great, 
looks particularly bad since some SUV clown backed into it.
If you're near Mountain View, CA,
it's the red one with the silver bootlid.

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