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Old 01-06-2007, 06:25 PM   #1
OldDog OP
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Mikuni fuel pump problems

Howdy All,
Having some trouble with the mighty Rallye, looks like it's not pumping fuel through to the carb (Dellorto PHM40).
I had the bike going and was riding it about but a dud battery pulled it up last week. While i waited for the replacement i've been finishing off stuff like the fuel line routing, chasing oil leaks etc until eventually i used up what fuel was in the fuel lines, filter etc, the bike started and ran fine with the tank removed.
Anyway, got the new battery fitted up, put on the tank etc, and it don't go! Just the occasional backfire etc. No fuel in the line, and after draining the float bowl it's obviously not pumping, this hadn't been a problem when i first assembled the bike though . So i primed the fuel line and filled the bowl, it but that hasn't helped, theres obviously no fuel pressure. I've removed the tank and wound the engine over watching the fuel filter, the level drops, but when i stop turning it over the fuel returns to the filter. I've turned the motor over with the fuel line off, it spits out the fuel i've poured in then nothing. I've hooked up a gravity feed line, but thie carb needs fuel pressure it seems. I suspect some sort of air lock inside the pump. Anyone know anything about these pumps? I can't find any identification on it other than "Mikuni" as you'd expect a search on here is only turning up carb info.
Any help appreciated!
Thanks
Bill
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Old 01-06-2007, 08:09 PM   #2
whiskeythrottle
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Make sure you have all the hoses are on correctly, and then - check to make sure the vacuum hose isn't collapsed or kinked.

If that doesn't solve it, get another pump. They're pretty common in northern lands as most snowmobiles use a similar vacuum pump. I reckon, however, that snowmobiles aren't too popular there downunder.
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Old 01-06-2007, 11:45 PM   #3
gunnerbuck
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I bumped up a fuel pump thread for you from a while back.......Probably many more but not so easy to search out.......
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Old 01-07-2007, 05:17 AM   #4
OldDog OP
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Thanks Gunner, I wasn't sure if these pumps were also used on the 640. I'll give the gravity feed trick a try, pressurising the tank didn't. Dammit
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Old 01-08-2007, 03:28 AM   #5
rjf
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Quote:
Originally Posted by OldDog
Thanks Gunner, I wasn't sure if these pumps were also used on the 640. I'll give the gravity feed trick a try, pressurising the tank didn't. Dammit
Turn the fuel tap on











bloody spoilt BMW riders
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Old 01-08-2007, 05:23 AM   #6
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Eh?

Quote:
Originally Posted by rjf
Turn the fuel tap on











bloody spoilt BMW riders
Fuel tap........................?









I wish it as that easy! Actually this thing mysteriously flamed out on Shane and we never got to the bottom of it......have now, bloody rooted pump eh. No big drama's though i've made one good one out of the two i just got it running, bet the neighbours arn't impressed
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Old 01-08-2007, 01:55 PM   #7
Jan from Finland
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A simple question, does it pump fuel from the tank if the cap is open? Tank venting might be blocked.
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