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High pressure engine driven fuel pump

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chasb(at)satx.rr.com
Guest

Posted: Sun Aug 08, 2010 10:14 pm Post subject: High pressure engine driven fuel pump

I recently had an engine rollback which I determined was caused by low  

fuel pressure on my AFP fuel injection system. Turned on the electric  

boost pump and got the engine back. Diagnosis: failure of the engine  

driven high pressure fuel pump.



Pulled the fuel pump off the engine today. The lever inside the pump  

was stuck at the full up position. I could not move the lever. I know  

in a low pressure pump, the lever can be moved by hand. Does anybody  

have any experience with a high pressure pump? Should the lever be  

moveable?



Second question: If the lever is jammed, can there be damage to the  

cam in the accessory section? If so, how can the damage be determined  

without pulling the accessory section off?



Charlie Brame

RV-6A  N11CB

San Antonio

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lessdragprod(at)aol.com
Guest

Posted: Mon Aug 09, 2010 8:38 pm Post subject: High pressure engine driven fuel pump

Hi Charlie,

    

   I have my high pressure fuel pump off of my IO-540 engine.  I can NOT move the lever by hand.

    

   The reason seems to be that the strength of the return spring inside the mechanical fuel pump determines the fuel pressure delivered from the fuel pump.

    

   Regards,

   Jim Ayers

   Less Drag Special (modified HR2)  25 hours TT

   Oxnard, CA.

   

 

 

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