There is a pressure regulator on the exit end of the 13Brew

secondary rail.

The housing on the exit of the primary is just for the fuel line

(on the

13brew). It could be the fuel temp thermosensor, which in the

13Brew is

mounted on the secondary rail.
My primary injector rail on a 13B has what appears to be a

regulator at

the entry end. It has a plastic cover on it and when I took this

cover off

out of queriosity, a screw fell out, put it back in put does the

amount the

screw is tightned affect the fuel pressure (presuming this is a

regulator)

or what is the screw for?
Wendell Voto

That is a pulsation damper. The injectors create pulsations in the fuel

rail which can affect the accuracy of fuel delivery between injectors. I've
never taken one apart, so I don't know about the screw.

Jon

The screw coming out of the pulsation damper is a common but dangerous
condition.

On the older cars, this causes fuel to leak past the plastic cap, onto the
engine, causing engine fires. I don't believe the screw's tightness is used
as a control variable for fuel pressure and had the impression that it was
supposed to be tight and fixed, all the way in (but could be wrong). Some
auto list people epoxy the screw back in as a repair though others insist
the part must be replaced.

I was concerned enough about this possibility that I took my own car out of
service to fix this.

If Brian Cain is still on this list, he can provide more details.

Barry Gardner
Wheaton, IL

Brian was but he had a problemn with his ISP.

Paul Lamar
 
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