Oil Heater, Pump Cavitating, What To Do? - HVAC - DIY Chatroom Home Improvement Forum

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Old 02-18-2013, 09:46 PM   #1
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oil heater, pump cavitating, what to do?

I had to move the tank 3 feet further down towards ground. So, now the heater pump needs to pull fuel up 3 more feet. There was already a long distance from tank to pump. About 40 feet. The tank was at the same height as the pump. fuel got pulled up about 5 feet, over about 30, then down about 5 feet. Its been working like this for 26 years. However, I had to move tank down 3 feet. So, its now pulling up 8 feet, then over 30 feet, then down 5 feet. However, now it keeps cavitating. What to do? Last resort is to move the tank back up. Someone said a small low pressure automotive fuel pump mounted at the tank to push the fuel. This work?



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Old 02-18-2013, 09:49 PM   #2
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sorry, central home heater, diesel fuel oil.

Looking for site listing of my email address, to make sure its right, However, cant find it anywhere. <Please don't put your email address in post.>

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Old 02-18-2013, 11:09 PM   #3
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To ans your question,no that won't work.Try running a return line from your pump to the tank and make sure the filter is replaced every year.
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Old 02-19-2013, 06:19 AM   #4
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Length of line is too long. When the tank was at same height, the 5 foot up and 5 foot down canceled each other out.

As said by rep. Run a return lie. You'll need to add a bypass plug to the pump. Another way is to install a tiger loop at/near the burner.
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