On 08/14/2011 10:17 PM, DLOMHEIM@aol.com wrote:

>I have the fuel system Kelly described in my RV-7A.

 

Hey Dennis:

 

I shot quite a few shots of your engine install at Tracy back in 07 (?) but don't have a shot of how you ran your orificed return...if you have a shot of that could you post it here?

 

All this talk of having a pressure bleed for the fuel system made me go out and modify mine.  If you have an Aeromotive style pressure regulator (I'm using model 13001), you might want to consider what I did. 

The regulator is composed of a base with an inlet on each side for pressurized fuel.  The top portion is held to the base with 4 screws, and contains a spring that pushes a steel ball down onto a post sticking up from the middle of the base.  An adjustment screw pushes on the spring, controlling how much pressure is needed before the ball is pushed off the base and fuel allowed to flow through the hole that goes through the post sticking up from the middle of the base.

I removed the 4 screws, wrapped up the base in some shop rags, leaving just the top of the post exposed, then used a cut-off wheel in my Dremel to make a deep scratch in the steel ball's seat on the top of the post.

I put it all back together, tested that the pumps made 60psi, regulated it back down to 50, then watched the pressure bleed off in about 5 seconds after I switched the pumps off.  Then I went in the house to recover from the gas fumes.

This method doesn't add any weight, connections or extra hose, but is 100% effective at relieving the fuel line pressure on shutdown.

This method