fuel press. regulator - V12

["Jan Wikström" <104707.3644@CompuServe.COM>]

Message text written by INTERNET:Juliansean@aol.com
>Would it be correct to assume that if the fuel press. reg. went bad that
high
fuel press. could result, followed by running rich?<

I would expect *low* fuel pressure to be a more common failure mode (tired
spring, adjusting screw coming loose, gum in the works), especially as the
valve spends most of the engine running time open. In normal cruising
around speed-limited areas, I'd guess at least 4/5 of what the fuel pump
delivers isn't used by the engine, so if the valve sticks, I'd expect it to
stick open.

I've never had a failure, except when (right after I bought the first Jag)
a prominent Jag workshop confused psi with kg/cm^2; they set my regulators
to 3.2 kg/cm^2 instead of 32 psi and replaced one regulator when they
couldn't screw it up high enough. The engine was a bit lumpy when I drove
home...

The same workshop thought something was wrong with the feed pipes from the
tanks because the engine stopped when they switched tanks...the left tank
was empty, as faithfully indicated by the gauge.

I gave the car to them for injection tune-up only because it needed
equipment I didn't have. After that experience,  I decided it would be a
better idea to buy the test equipment...

-Jan

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