Al, I have a friend in CA who has his own shop repairing Mazda

Rotary

engines for over 20 years.  He says to ditch the fuel rail pulse

dampener as

it is only a matter of time (not if) before the pulser develops a

fuel leak

due to fatiguing of the dampener disk.  FWIW

Ed Anderson

Snip

       Paul and All,
           I believe we have a major safty problem here. We need to put

an "AD" out

 to all that plan on flying the 13B or 20B using the stock primary fuel

rail that

 they should remove the pulse dampener.
           Just a week ago a friend asked me to look at a fuel leak on a

87 RX-7. It

 was leaking profusely when the fuel pump was activated. To make a long

story short

 it was the pulse dampener. Since I do not work on RX-7's for a living I

thought it

 was an isolated incident. Ed's post brought to light that we who want

to fly these

 things have a inflight fire fed by 40 psi of fuel just waiting to

happen!

          Kelly Troyer

The reason these leak externally is because the pole piece on the 86-88 PDs
is a screw that becomes separated and rips the membrane. The design of the
89 and newer PDs will not leak even if the membrane rips because it's a
sealed metal unit. This is a common failure point for the earlier cars.
Problem is the fuel rails are different, or else they could just be swapped
to the newer style.

Mike Harrington

 
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