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Author Topic: Airlock in fuel line?  (Read 2171 times)
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mangocrazy
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« on: September 16, 2013, 09:25:28 PM »

We've just visited the moneypit in France and one of the first tasks is always to get the Spider running. This time it really didn't want to start - the fuel filter behind the pump in the fuel line remained stubbornly empty, and I was convinced the pump had failed. I was about to take the pump off for further bench inspection and loosened the jubilee clip on the outlet (carb-facing) side of the pump. As I eased the hose off the fuel pump barb I heard a sharp hissing sound and all of a sudden the filter filled up with fuel.

I can only assume that there was an airlock between the carb and the pump. What could cause this? Sticking float valve perhaps? All I know is that as soon as the pressure was released and everything put back together, the car fired up first turn of the key.

Very strange...
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1980 Lancia Beta Spider 2000 (S2FL)
2002 VW Transporter T4
2017 KTM Duke 690R
2008 Aprilia SL1000 Falco
1992 Ducati 888 SP3
1988 Honda VFR750F
1980 Yamaha RD350LC
peteracs
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« Reply #1 on: September 16, 2013, 11:10:40 PM »

Hi

So is the money pit the car or the house...Huh??

Peter
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Beta Spyder S2 pre F/L 1600
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Neil-yaj396
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1979 1300 Coupe


« Reply #2 on: September 17, 2013, 07:00:41 AM »

This isn't unusual when a car has been standing, especially if it has been hot. The fuel in the carb will have evaporated then the relatively weak manual pump can't blow it through. Is your return line clear as a partial blockage here makes things worse.

I have a priming bulb that I bought to prime the carb after a five month lay up.
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mangocrazy
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« Reply #3 on: September 17, 2013, 06:33:48 PM »

Peter - the moneypit is the house. And you thought Lancias were bad...

Cheers Neil, yes it's been left for 4 months since the last visit and July/August were (apparently) tres, tres chaud... The mechanical pump was changed for an electric Huco pump about 6 or 7 years ago and has only done a few thousand miles in that time. It's a 'pull' type rather than the Facet 'push' types and lives in the engine bay. I've seen those rubber priming bulbs on eBay and have been meaning to get one for a while now. I think that would be a wise purchase in view of the above.

When I fitted the Huco I blocked off the return line, as it now serves no purpose. Don't know if that would have contributed or not.
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1980 Lancia Beta Spider 2000 (S2FL)
2002 VW Transporter T4
2017 KTM Duke 690R
2008 Aprilia SL1000 Falco
1992 Ducati 888 SP3
1988 Honda VFR750F
1980 Yamaha RD350LC
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