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MARK_21 Member Posts: 19
I have a Rheem Hot air system with a becket gun.. My oil tank is outside above ground (Its new) my question is-When the gun stops firing and shuts down-what are the chances that the 275 gal tank of oil could drain past the pump into the chamber when its not running? Just wondering becaue my tank is much higher then the rheem unit in my basement! Thanks! MARK


  • Bill NTSG
    Bill NTSG Member Posts: 321
    You should.........

    get an oil safety valve.

  • Arthur
    Arthur Member Posts: 216

    Normally the pump would not pass oil if the pressure regulating valve in the pump is ok. The Valve prevents oil passing to the nozzle untill a decent pressure is reached. The newer pumps have a solenoid valve which is controlled by the controller, The new pumps tend to run with controllers that have prepurge so the oil can not get out to the nozzle until the end of the prepurge cycle but if your burner is an older model without the solenoid valve one can be fitted to only open when the motor is running, I have fitted solenoid valves when the burner suffers from shutdown dribble,Just fit the solenoid to the oil pipe between the pump and the nozzle and wire to the motor terminals.
  • J.C.A._3
    J.C.A._3 Member Posts: 2,981
    OOPS !

    Arthur, What happens if the seal in the fuel unit blows? The right advice was the Oil Safety Valve, but READ THE INSTRUCTIONS!!! Unless things have changed in the last few months, I seem to remember that they recommend NOT mounting them outside. Chris
  • Alan R. Mercurio
    Alan R. Mercurio Member Posts: 588

    As usual you're right Chris :) When installing an OSV it must not be installed more than 3 feet above the fuel unit. In most cases if the tank is outside there is usually more than 3 feet of height between the tank and the fuel unit.

    I also like the idea of the solenoid valve in addition to the OSV although the chances of the fuel bleeding past the regulator are there it would be rare for that to happen. I stress rare but it could happen. An ounce of prevention.........you know the rest :)

    Your friend in the industry,
    Alan R. Mercurio

    PS Good call Bill!

    Oil Tech Talk
  • MARK_21
    MARK_21 Member Posts: 19

    If i cant use a OSV valve would a delayed oil valve work? My outside tank has about 3 ft of oil line before it heads through the foundation down to the burner-so i guess the osv is a no go? Why is it you cant have the OSV more then 3 ft from the tank? Thanks for all your help!!
  • John@Reliable_4
    John@Reliable_4 Member Posts: 101
    The proper way with outdoor tank ..........

    is an "anti-siphon" valve. This valve goes on at tank and is like an OSV but can be installed outdoors. It's all brass and priced allot more but still cheaper than an oil leak. Mark, an osv above 3' can open and let oil flow that's the reason. An oil delay valve is a good idea but not for an oil leak only for combustion reasons. Hope this helps John@Reliable
  • MikeB34
    MikeB34 Member Posts: 155

    Beckett recommends a max pressure to the pump of 3 psi. If your tank is MUCH higher, graity pressure can cause your pump seal to go. make sure you have a pressure reducing valve on the line.

  • Arthur
    Arthur Member Posts: 216
    Oil Question

    Well did I read that wrong then I understood the Question was the oil getting past the pump into the conbustion chamber. If the pump seal seals goes the oil will leak OUTSIDE the chamber not into the chamber. The pressure will not build up as it will just go round and round inside the pump on one pipe systems and on a two pipe system it will just return to the tank.I've never had any bother with the several I've done over the years.
    I don't see how a Oil saftey valve would know if there is post dribble into the combustion chamber?? I thought this was the original Question.
    A OSV is a good idea but doesn't solve the original Question.
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