i bought a 1988 jaguar xjs. its running pretty good. I have a jaguar maintenance done to my car and the technician noticed that the right hand fuel return valve is disconnected. He's charging me alot of $$ to reinstall this back. i was told that he need to remove all the panel..etc. what is the purpose of this and why is my jaguar still work eventhough this is not connected/

 

Welcome to the forum jomia092306,

I've found your question about the fuel return valve at the end of a newbie Intro and moved it to XJS forum. Members here with the same model will be able to help.

Graham

 

Do you mean the RHS fuel pressure regulator that (if it were there) sits on the end of the fuel delivery pipe just before the fuel rail?

If so, it is not needed and you can forget about changing anything. The LHS regulator controls the rail pressure, the RHS one was fitted by Jaguar to (most people think) unnecessarily prevent fuel pressure 'hammer' in the supply line.

 

Thanks greg. You're right it is the RH pressure regulator. So my car will still work(and it does) if this is disconnected ? I was wondering why it is disconnected ?..Thanks

 

Yes the engine is comletely unaffected. The regulator AFTER the rail (the LHS one) is the one that maintains the pressure in the injector rail. The RHS one was fitted by Jaguar to damp out any possible pump pressure harmonics before the rail. It is unnecessary and lots of people remove them to simplify the system.

Greg