Question about Reddy R155D Utility Heater

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Can not adjust air pressure to keep it running!!

I can get the unit fired but the pressure will not adjust. If put a clamp on the fuel line to restrict the pressure it runs fine (air pressure is still not right) , but when the top cover is placed on the unit the flame goes out!!!

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  • Anonymous Jan 14, 2009

    can't adjust presure

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  • 232 Answers

Provided the rotor and vanes are serviceable the pump should produce around 10 psi if you completely close off the airline tubing. If your gauge will not read with the tubing totally restricted, then I would check the relief valve to see if the ball is in first, then the spring, then the screw with the hole. These items should be in the longer of the 2 bosses. If no pressure reading at this time you either have a broken rotor or a defective gauge.

If you get some pressure with the tubing restricted, but there is not enough, then use soapy water to find the air leak. If there is a crack in the plastic end cover- replace it.

How to set the pump pressure

Posted on Dec 11, 2008

  • John Fleming Dec 07, 2011

    try replacing the air pump rotor and vanes, I had the same problem until I replaced them.

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Removal & Installation

  1. Relieve the fuel system pressure and disconnect the negative battery cable.
  2. Remove the fuel filler cap from the fuel tank.
  3. Have a Class B fire extinguisher near the work area. Use a hand operated pump device to drain as much fuel through the fuel filler neck as possible.
  4. Use a siphon to remove the remainder of the fuel in the tank by connecting the siphon to the fuel pump outlet fitting.
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  5. Reinstall the fuel filler cap.
  6. Remove the rear seat cushion from vehicle (if so equipped).
  7. Disconnect the fuel pump motor connector and sending unit electrical connectors.
  8. Disconnect the wire harness grommet and harness through the vehicle floor pan.
  9. Raise and safely support the vehicle.
  10. Remove the fuel filler hose clamp from the filler neck assembly.
  11. Remove the fuel breather hose clamp from the filler neck assembly.
  12. Remove the fuel filter inlet hose clamp and hose from the filter.
    NOTE A small amount of fuel may be released after the fuel hose is disconnected. In order to reduce the chance of personal injury, cover the fitting to be disconnected with a shop towel.
  13. Remove the fuel vapor clamp and hose, and fuel return hose clamps and hose from the respective fuel lines.
  14. Using a suitable transaxle jack, support the fuel tank.
  15. Remove the fuel tank retaining bolts and lower the tank.
To install:
  1. Reconnect all fuel hoses, lines and the fuel breather hose to the fuel tank.
  2. Place the fuel tank in its proper space using the transaxle jack, Install the fuel tank retaining bolts.
  3. Remove the transaxle jack.
  4. Reconnect all fuel hoses, lines and the fuel breather hose to the fuel tank.
  5. Install the fuel breather hose and hose clamp to the filler neck assembly.
  6. Install the fuel vapor hose and hose clamps. Install the fuel return hose and hose clamp to the respective fuel lines.
  7. Install the fuel filter inlet hose and hose clamp to the filter.
  8. Lower the vehicle. Install the wire harness and grommet through the vehicle floor pan.
  9. Connect the fuel pump motor and the sending unit connectors.
  10. Install the rear seat cushion. Reconnect the negative battery cable.
"

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2. Connect the outlet hose to the top filter nipple. Connect the inlet hose to the lower nipple. Push the fuel lines up over the nipples as far as possible. Compress the fuel line clamp tabs and slide the clamp up each line until it is secure over the nipple.
3. Position the clamps at least 1/4 inch from the connected end of the fuel lines, making sure the clamps are set over the nipples. Start the engine and allow it to idle. Check for fuel leaks and make the necessary adjustments. Turn the engine off. Lower the vehicle.
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Thank you for using fixya and be safe.



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