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Old 10-28-2019
turbotoyz turbotoyz is offline
Junior Member
Join Date: Aug 2014
Location: Snoqualmie Valley
Posts: 26
Default My Sporlan troubles

Hi guys,

Yet another Sporlan problem here. I've scoured the site but haven't found a solution to my problem.

Couple of years ago, I had trouble getting the tank to fill on my 1988 WB40. I disassembled sporlan and soaked in vinegar, and reassembled with success.

Fast forward 2 years, started having same problem. Slow flow rates, difficulty to get it to fill which slowly got worse.

This time I cleaned with no success, and I ended up reassembling incorrectly with spring pointing down rather than up. I found that the sporlan was always open -- city water would always result in tank filling regardless of swich position and the pump wouldn't pressurize. I disassembled, and then reassembled correctly (I think!) with spring pointing up.

Retested, and exact same problem now -- tank always fills, pump won't pressureize.

So I go order diaphram kit and coil kit from Dupree Products, disassemble, put new components in, and it STILL has same symptoms of always filling tank and system not pressurizing. It feels like the switch is always open. I'm 99% certain it's reassembled correctly, I've looked at the scehmatics and am banging my head against the wall trying to fixed it.

What should I do next? I think I've done everything correctly but it just keeps filling and filling....

Any advice appreciated.

Kevin Carver
Carnation, WA
1988 WB40
1991 Bluebird Minibird
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Old 10-28-2019
nbedinger's Avatar
nbedinger nbedinger is offline
Goat rails in the sunset
Join Date: Jul 2012
Location: Freewheelin'
Posts: 1,805

Try testing for power at the Sporlan. To fill tank, Sporlan valve has to get power from switch. If you can't switch OFF to close the Sporlan... something in there isn't right. Switch failed in tank fill ON position? The power wire on the valve would be always hot if that's the case.
Ned Bedinger
1991 SP36
BB Body No. 93327
Full-time in 2019
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Old 10-28-2019
sfedeli's Avatar
sfedeli sfedeli is offline
Senior Member
Join Date: Jan 2008
Location: Hershey
Posts: 3,203

When filling the tank, are you turning off the supply when it starts to overflow? You should always cycle the sporlan (UNDER PRESSURE) which assists the diaphragm in making a tight seal and closing the valve. Many owners make the mistake of turning off the faucet before turning off the sporlan fill switch. This will often result in a "backflow" situation where the system will not pressurize.
Shane Fedeli
Hershey, PA

"Savor the wine of youth, for it is a drink that can be consumed only once”
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