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 HS2 fuel overflow

 Created by: onetim
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 Posted: Jun 5, 2018 04:37AM
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Sorry no pics of the fuel level when draining out of the overflow tubes. Normal fuel level measures about 30mm from the top of the bowl. Pictures of the layout, float open, closed, and the fixed limit tab for how far down in the bowl the float can drop. Thank you.

 Posted: Jun 3, 2018 07:18AM
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US
In an earlier post you said that the float bowls were both about 1/2 full.  Have you checked the bowl level immediately after the overflow occurs?  Can you post pictures of your carb plumbing?

Doug L.
 Posted: Jun 2, 2018 07:05PM
 Edited:  Jun 2, 2018 07:10PM
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So I did the needle seal test, seals perfectly, thinking that the white plastic floats drop too far down into the float bowls when they are empty, binding the needle with no means of adjusting. This has nothing to do with float level, or the upper shutoff level, which can be adjusted and appears to be correct. So the car is working fine now no pissing at the moment. I see our hosts sells phenolic black floats with metal tabs, but I would like to buy some good old brass ones if anyone has some.

 Posted: Jun 1, 2018 07:22PM
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In the carbs I have (I think it works for all plastic floats) the fuel level is controlled by shims/gaskets under the seat. If you've carefully inspected the needle tip (actually about a sixteenth or so from the tip) for damage/ridges I would be removing the seats and checking that the shims/gaskets are OK and that the seats are secured properly in the lid....

You can test the integrity of the needle and its seat by removing the lid, installing the needle and holding it in place with light finger pressure.  With the lid the right way up blow into the intake.  If there's a leak you will hear it.  By reducing your finger pressure you will be able replicate the fuel pressure allowing fuel past the seat while a little more pressure will stop it.  (Well the pressure doesn't actually blow the needle off its seat rather the falling fuel level in the bowl allows the float and the needle sitting on it to fall down under gravity...) 

It doesn't take much finger pressure to block a fair bit of lung power. 

Cheers, Ian

 Posted: Jun 1, 2018 05:14PM
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Well, A bit of an update, pulled apart both float bowls, cleaned, polished the four slide faces on the needles, they are brass with neoprene tips. Fuel level looked even in both bowls, a little over half full. Has plastic floats that look dry inside. Put it all back together, started it up and it pissed gas all over the floor like a scared puppy. Same carb overflowing as before. I see the plastic floats have a non bendable stop tab for how low it allows them to drop into the bowl. Looks a bit excessive to where it could possibly hang up on the bowl wall. Thoughts, ideas? I could test this by putting in an approximately correct amount of fuel in the bowl, then see if it stops overflowing. This would explain only having the problem the first run of the year. But then what, file the edge of the float,  buy a different kind? Thanks again

 Posted: May 31, 2018 03:06PM
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Everyone has an opinion about Grose jets.  I have used them.  I won't anymore.  I have had them stick open and I've had them stick closed.  If you decide to use them, wash them first with a liberal amount of spray carb cleaner.  The units are shipped with a Cosmoline like coating to prevent the steel balls from corroding while in storage.  That coating needs to be removed prior to installing the jets.

Doug L.
 Posted: May 31, 2018 12:06PM
 Edited:  Jun 1, 2018 04:49AM
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Quote:
Originally Posted by onetim
Hi all, I have had a fuel overflow problem on my left HS2 right from the start after a rebuild. The first time just a tap on the bowl fixed the issue for the season, same thing the next year, this year, ah, not so good. No problem at first, then loaded up on a short drive, and cleared out, signs of fuel having leaked out of overflow tube. Ok no big deal, will change needle and seat, check for smooth operation. but I see for sale a Grous jet, is it better, or just change out with stock neoprene. I do have a clean looking filter at the firewall, And I don't think its all a crud problem, as this started from the rebuild. Thank's for your insight.
I think it was Dan Moffet that posted he had issues with a nylon needle and seat that when it warmed up the nylon expanded slightly causing it to stick open. He sanded the edges down and had no more issues.
The grose jets seem to work well as do the viton ones with the rubber tip

If in doubt, flat out. Colin Mc Rae MBE 1968-2007.

Give a car more power and it goes faster on the straights,
make a car lighter and it's faster everywhere. Colin Chapman.

 Posted: May 31, 2018 08:44AM
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Hi all, I have had a fuel overflow problem on my left HS2 right from the start after a rebuild. The first time just a tap on the bowl fixed the issue for the season, same thing the next year, this year, ah, not so good. No problem at first, then loaded up on a short drive, and cleared out, signs of fuel having leaked out of overflow tube. Ok no big deal, will change needle and seat, check for smooth operation. but I see for sale a Grous jet, is it better, or just change out with stock neoprene. I do have a clean looking filter at the firewall, And I don't think its all a crud problem, as this started from the rebuild. Thank's for your insight.

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