Jaguar Repair: 1985 XJS gas in the oil, fuel pressure regulator, vacuum hose

Question
QUESTION: What might cause gas in the oil that blows out of the exhaust..Injectors maybe??

ANSWER: Hi Bill,
You will have to clear that up a little for me. "gas in the oil that blows out of the exhaust" ??????

Do you mean you have blue smoke out of the tail pipe? and is your oil in the pan thin with gas in it?

Does your CAT in the exhaust get red?

Howard

---------- FOLLOW-UP ----------

QUESTION: Thanx for responding, it is oil in the pan thin with gas...Thanx

Answer
You didn't tell me if it passed emission tests. It is a lot of work to pull all the injectors out to see if they are leaking and thus each time you shut down the pressure in the rail would be dumping fuel into a port and if a valve is open, it will run past even a good set of rings. So it would not take long for this to dilute the oil in the pan. Leaking or stuck open injectors will also effect the CO and HC reading of an emission test. Another possible is a leaking diaphragm in the pressure regulator. It will also pump fuel into the intake system. Even though both of these problems will tend to burn off most of this fuel while running, each time you shut down they will pump raw fuel into the intake.
I doubt you could pass an emission test when the oil was diluted but it would still show up on an emission test even with fresh oil.
The fuel pressure regulator is easy to check by just running the engine and shut it down and remove the vacuum hose from the regulator and shake it to see if there are any droplets of fuel in it. The injectors take a lot of work to see if they are leaking but you can just remove all the plugs after idling for a while and examine them for signs of excess fuel. (flat black carbon in a powder form)
To test the injectors you would have to remove them from the manifold and leave them connected to the fuel and with a fire extinguisher handy, activate the fuel pump. No fuel should come out of any of them. Great care must be taken here as spraying fuel is easy to ignite so this must be done outside with another person to man the fire extinguisher.
Let me know,
Howard