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Old 10-12-2008, 23:49   #16
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Join Date: Jan 2008
Location: San Juan Islands, WA
Boat: 1988 Brewer Three Seas 40' Pilothouse
Posts: 251
I just installed a Wallas furnace, which replaced a Volvo furnace. Both units are very similar. I have a seperate dedicated pick up tube in one of the fuel tanks for the heater, and the heater needs to be above the top of the fuel tank to avoid siphoning, not sure if this is the same with the Volvo or not. Everything I have read says you should not use the supply line to your engine to supply a furnace, it can cause trouble for both engine and heater. Scan Marine in Seattle is the dealer for Wallas and they are very knowledgeable and helpful, and were familiar with the Volvo furnace, you might give them a call. The pick up tube in the tank is simple if you have an access hatch you can get to. It just requires drilling a hole in the top of the tank and feeding the fitting up through it from inside the tank, then tightening the nut on top (mine had been removed and a bolt and washers installed to plug the hole). The fuel line for the Wallas was the same diameter as the old line so it fit on the old pick up tube which was still on the boat when I bought it. Scan has new pick up tubes and fittings. Good luck, PM me if I can be any help, going to get cold this weekend. John
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S/V Laurie Anne
1988 40' Brewer Pilothouse
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Old 11-12-2008, 08:19   #17
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Location: Vancouver Island BC
Boat: 41' Morgan Classic
Posts: 105
Thanks jrd. I know I have an extra fitting on the top of the fuel tank, I'm just not sure whether there is a tube into the tank connected to it. I sure hope so, as it will be extremely difficult to put one in.

I'm pretty sure the furnace came from Scan, I'll definetly give them a call if necessary.
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