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What fuel pressure should I see for electric or engine fuel

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Jerry Grimmonpre'

Joined: 09 Jan 2006
Posts: 144
Location: Huntley, Illinois 60142

Posted: Fri May 19, 2006 10:09 am Post subject: What fuel pressure should I see for electric or engine fuel

I've read on the RV list about two months ago ... someone experienced the 

same results ... about 6 PSI with a mechanical pump that should put out the 

higher pressure for injected engines.  This pump had the wrong P/N on it. 

It was a low pressure pump with a high pressure P/N.  Can't trust anything 

anymore!

Jerry Grimmonpre'

RV8A



 	  Quote: 	
		   



 Ray,



 Metered fuel pressure downstream of the servo is around 5 psi with little 

 if

 any change when the electric pump comes on.



 If you measure fuel pressure just downstream of the mechanical pump, 

 before

 the servo, you should be able to see the electric pump boost the pressure 

 to

 30-40 psi.  That's how you know it's working.  The mechanical pump alone

 should keep it around 20-30 psi.  6 psi is about right for a carbureted

 engine.  Carbureted engines use a lower pressure mechanical fuel pump

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