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140/164 Series General Forum for the Volvo 140 and 164 cars |
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HS6 Fuelling ProblemViews : 1894 Replies : 10Users Viewing This Thread : |
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Jan 7th, 2023, 17:13 | #1 |
New Member
Last Online: May 17th, 2024 10:58
Join Date: Mar 2022
Location: Seaton
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HS6 Fuelling Problem
Hi, I have a rally prepared Volvo 142 fitted with twin HS6 carburettors. I had some difficulty getting these set up but once sorted they have performed magnificently. Until... I removed the carbs & manifolds to access the oil cooler pipes and on replacing the carbs the forward carb is spewing fuel out of the overflow. I suspected the float needle valve was dislodged or sticking but this does not seem to be the case. The float appears to float quite happily and the needle valve moves freely. However there is a ring worn around the viton tip. The needle valve, housing and float were recently purchased from Burlen. Am I missing something?
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Jan 8th, 2023, 00:41 | #2 |
Senior Member
Last Online: Yesterday 22:27
Join Date: Dec 2015
Location: eastsussex
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Hi
yes probably a tiny pit of dirt that is so small you cant see it on the seat have you got a in line filter or just the one in the pump |
Jan 8th, 2023, 10:53 | #3 |
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Last Online: May 17th, 2024 10:58
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Location: Seaton
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I had thought that but I have now dismantled it 3 times and flushed it through but it still persists, I will try again tomorrow! Thanks. It just seems odd that it has only happened after I have removed and replaced the carbs.
It has a Malpassi Filter King pressure regulator and filter. |
Jan 8th, 2023, 11:02 | #4 |
Chief Bodger
Last Online: Today 11:49
Join Date: Oct 2009
Location: Aberdeen
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Have you set the float height also check the float for holes (put it in a bowl of water).
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One day I will get rid of all of the rust. Last edited by Burdekin; Jan 8th, 2023 at 11:11. |
Jan 8th, 2023, 15:26 | #5 |
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Last Online: May 17th, 2024 10:58
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Location: Seaton
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Thanks, I've tried all that.
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Jan 8th, 2023, 18:02 | #6 |
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Last Online: Yesterday 00:31
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Location: Saskatchewan, Canada
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I haven't lived with this on an SU; but, I did encounter this problem on a motorcycle. In my case, after a 5 month storage period with no fuel in the carbs the viton tip on the needle would not seal reliably. Presumably the rubber had hardened leading to a seal sometimes, pour gas on the floor sometimes situation. A new needle fixed the problem. Interestingly the new needle and the old needle looked identical with no obvious signs of wear on the original needle.
With the bowl and float removed from the carb, rig a hose up to the fuel inlet so that you can blow through the hose. Use your finger to gently lift the needle up to the seat - the float cannot exert a huge amount of force so you should not have to either. Blow through the hose and if the needle is not sealing, then you still have a needle valve problem. Either damage to the seat or a problem with the viton tip. You said you purchased (and presumably installed) a new needle, float and housing. Is that before the leak or after? Does 'housing' include the seat for the needle? It is possible that although the replacement needle is new to you, the viton may have hardened a bit while sitting on the vendor's shelf leading to a fail to seal problem. When I did my repair, I initially tried to rehabilitate the original needle by scuffing the viton with some 600 SiC paper which did nothing. Try the hose and puff test. That should determine whether it is a needle valve problem. Whether it is the actual needle or the valve seat requires further investigation. |
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