ian balson Posted June 22, 2004 Share Posted June 22, 2004 Chaps, Need some help with this one. When I shut my engine down I get a leak from the right hand weber 45 DOCE for around 10 seconds, 1 drip/sec roughly. It's not leaking from any place on the top, and we've removed it and checked the underside access plate, sealed the gasket etc so it's not coming from there. The drips fall from the area by the rubber mounting washers on the right hand barrel. For the record it's on a VX2.0 The problem doesn't occur when ticking-over, and there is no evidence of it appearing when under way, it only occurs as the engine is turned off. Any help welcome. Thanks Ian Link to comment Share on other sites More sharing options...
Steve C Posted June 23, 2004 Share Posted June 23, 2004 Same problem with my x-flow 45's.Makes for the odd fire! I've had all sorts looked at and various bits on the Webbers replaced (don't know enough to understand what!) ...and it still does it ! Any ideas guys? Cheers Playing the Lo-tech Hi-spec Weber music! 'Go on do that thing when your carbs catch fire' Link to comment Share on other sites More sharing options...
Roger King Posted June 23, 2004 Share Posted June 23, 2004 You need to check that you have correct fuel pressure (around 3psi), that the float level is correct (8mm or 13mm for brass and plastic floats respectively), and that the needle valve is in good condition. Too much fuel pressure can make things worse, as can too high a float level (high means a LOWER figure such as 11mm instead of 13mm) or worn needle valves. In addition you need to make sure that idle jets are not oversized and the idle screws are set correctly. If either of these are making things too rich, you will encourage excess fuel to puddle in the bottom of the carburettor and leak out past the 'O' ring mounting. Sometimes, though, you find that everything is set correctly and in good condition and the damn thing still does it. One of the joys of carburettors compared to injection. Link to comment Share on other sites More sharing options...
ian balson Posted June 24, 2004 Author Share Posted June 24, 2004 Thanks Roger, Will check that out. Rgds Ian Link to comment Share on other sites More sharing options...
ian balson Posted June 28, 2004 Author Share Posted June 28, 2004 Well, I checked the float levels, spot on 13mm. So I have tightened the carbs up onto the head a little more. This appears to have done the trick. (Also ordered a fuel pressure regulator). Next question, what are the symptoms of over tightened carbs. They still move a little. Took it out for a very short run around town, didn't notice any misbehaving. What should I be looking out for? Rgds Ian Link to comment Share on other sites More sharing options...
Peter MarieEa Posted June 28, 2004 Share Posted June 28, 2004 Hi Ian, I have a not dissimilar problem with my '94 VX HPC; not an external leak but the car flooding after shutting down the engine. The first thing I checked was the fuel pressure with an accurate guage and the reading was a very stable 2.8psi ; hence in my case I don't believe a fuel pressure regulator is necessary. You may want do the same. I haven't measured my float levels yet. Quick7 Link to comment Share on other sites More sharing options...
ian balson Posted June 29, 2004 Author Share Posted June 29, 2004 Peter, Had a similar problem to that a while back. Turned out to be a faulty needle valve in the float chamber, maybe worth a look? Rgds Ian Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now