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Jul 23, 2018 16:56:21 GMT
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I have a Weber 32 DIR from a Volvo 340 that has a fuel return on it that goes back to tank. If I just block this off will it work ok?
If I do need to use the fuel return for it to work ok can I just "T" into the fuel feed just before the petrol pump.
TAI
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Jul 23, 2018 20:51:18 GMT
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They are usually fitted to prevent vapour locks in the fuel line by increasing the flow at low engine speeds, whether you need it or not will depend on your installation. If you do fit one it will need a restriction if there isn't one in the carb.
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Thanks Kevin's. There's no restriction in the outlet. It's about 10mm in diameter
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Jul 24, 2018 15:21:36 GMT
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Just because there's no restriction at the outlet from the carb doesn't mean there isn't one on the way back to the tank, maybe even at the tank.
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Jul 24, 2018 18:11:53 GMT
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Just because there's no restriction at the outlet from the carb doesn't mean there isn't one on the way back to the tank, maybe even at the tank. I'd thought that too. I found a mig tip jammed in one of the pipes that came with the engine today. I think this may have been used as the restriction. |
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Thanks to bosnod, who put a manual for the carb up on my van thread, I have learned it is not in fact a fuel return, but a vent. There should be a plastic cap fitted on the end of the stub, but this is missing. Thanks for the replies.
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Jul 26, 2018 14:11:54 GMT
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can I just "T" into the fuel feed just before the petrol pump. I've always been a bit skeptical about this way of resolving return to tank lines. It seems to me that if you just T the return back into the feed line, you are as likely to get push-back pressure up the return line and it might affect fuel pressures back at the carb. That's always been my (untested) theory, and I have always felt that this could only ever work with a one way valve also fitted to allow returning fuel to re-enter the inlet fuel flow without the inlet fuel flow countering the return flow. Either that or the return T needs to be before the fuel pump where it will be sucked forwards by the pump's action. If you know what I mean. (^ All totally untested, and I am a badge-carrying numpty) |
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Last Edit: Jul 26, 2018 14:12:50 GMT by Deleted
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Jul 26, 2018 14:40:53 GMT
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Hi, Another possible problem with 'T'ing into the pump feed from the tank is, particularly with carbs, the issue of fuel vapourisation. Because it doesn't allow the fuel to dissipate some of its heat which it could do if it mixed with the cooler fuel in the tank.
Colin
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