I know Peter spoke about this a while back but over the weekend I worked on a 650 Weber 28IMB for a guy who said it did not run well and leaked petrol. Apart from an issue with the idle mixture jet I could not find any fault apart from a minor bow on the top cover and the float needed adjusting. The guy had only just bought a new refurbish kit from a well known South London Fiat specialist outlet. I decided to change the carb top cover and when swapping over the large gasket I felt it was a little flimsy. So out came the vernier callipers and the new gasket was about 40% thinner than an old one I had. So new/old gasket fitted and went to adjust the float and suddenly it was spot on. When I changed the carb top I had left the old inlet valve set in place. The old original inlet valve was taller than the new one hence the adjustment being right. So much for the new refurbish kit.
Technical Aftermarket Parts
- Thread starter Toshi 975
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Technical Aftermarket Parts
the hobbler
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And you wonder why I have such a hatred of 'pattern' parts?
I'm pretty sure a crappy repro fuel pump is the current fault of Martina's out-of-service status. She's parked in a friend's garage and we're mid-move, so I don't really have ready access to my tools, so I can't fully troubleshoot, but not long before the move, I replaced the fuel pump after installing the new motor. She'd been running great since, but when we went to go for a ride recently, she only sputtered at first and wouldn't start. Cue an oily-gas leak from around the pan. I could not pin down a leak source, but based on that alone, I'm betting the diaphragm failed and dumped gas into the oil. It'll be a while before I can get around to taking a look though. Pretty bummed as we were excited to cruise her in the new neigborhood.
the hobbler
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Before you go ripping things apart, take the "in" fuel pipe off the pump and check that fuel is coming through to the pump. These cars have a habit of the fuel syphoning back into the tank when left for a fairly lengthy time. If no fuel is coming through, you can either suck it though with a vacuum pump or, blow it through by using an air pump to pressurise the tank. Leave the fuel-pipe off the pump, put the air-line into the filler of the tank, wrap it with rag (to seal it) and pump air into the tank until it runs out of the pipe at the rear--rapidly refit fuel-pipe to pump! This is best done with 2 people--1 person at rear of car to re-fit fuel-pipe as soon as fuel flows out.
