R2800 cutting out

Discussion in 'Engines' started by Daddio, Dec 11, 2009.

  1. Daddio

    Daddio New Member

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    Engine: P&W R2800-CB3 probably from a DC-6
    Application: wind generator (ground use only)
    Symptom: stalls out during operation with almost no warning. For a few seconds prior to cutout, the fuel pressure wobbles a bit, then starts dropping fast. She will recover with boost pressure. Intermittent boost application will prevent the stalls, but I want to fix what's wrong.
    So, what's wrong?
    I recently replaced a very leaky engine-driven fuel pump. I thought a slight shaft seal leak in the boost pump was causing stalls due to sucking air bubbles into the line, so I also replaced the boost pump. I have not found a fuel leak in the 20' of line running up to the engine, but some of it's covered up; I'll be dismantling things later.

    Question: What else can cause her to just drop out like that, or am I positively looking for a fuel line leak sucking air?

    Fuel pressure during a normal run is about 22½ psi. With boost, it climbs to almost 25 psi.

    Thanks!
     
  2. engguy

    engguy Member

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    Did you get this figured out yet?
     
  3. FLYBOYJ

    FLYBOYJ "THE GREAT GAZOO"
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    Did you check for water in your fuel system?
     
  4. operator18

    operator18 New Member

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    Check the vapor return line or there could be a problem with the auto rich control.
     
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