4 replies to this topic

[smileytony]

Hi all,

I've just got my engine running after plenty of hassle. I bought a set of rebuilt twin 1.25" SU's and they look great.

Problem is that both floats are leaking. Not as in a gush of petrol but if I leave the motor for a week in the garage then when I get back you get the attached.

I've set the float clearances and it's still doing it.

The carbs haven't been set up at all yet and linkages etc are still loose - I literally just got it turning over and started!!

Does anyone have any ideas of what I can do?


Thanks!

[Surfbluegarage]

too much presure? my twin 1 1/4 sus leaked from the top of the float bowl so i got a filter king pressure regulator.. never did it again after that

[dklawson]

Most HS2 and HS4 SUs that I've seen do that to some degree. You may never eliminate this but as Mini_mad_dapsi said, you can start by checking the fuel pressure and adjusting it downward to 2-3 PSI using a regulator if necessary. Another thing that can help is to make every effort possible to route those nice Petroflex lines of yours so they stay below the float bowl covers. I found that I had a pronounced "post shut down" gas deposit forming that was helped by making sure all the lines were as low as possible.

[smileytony]

Hi guys and thanks for the info. Unfortunately the hoses an't be router any lower because I'm using the solid metal pipe to split the fuel to the two floats (the one that fixes via the top carb mount bolts). They dictate where the hoses can and can't run!

I'll have a look at the pressure regulator....I'm running out of room!

[dklawson]

I understand. However, you will have a bit of hose at the front carb, possibly between the front carb and a last inline fuel filter. Try and keep that bit of supply hose lower than the metal pipe. Anything you can do to keep the fuel supply below the float bowl covers will reduce seeping.