Vr fuel leak into engine

[ozengines]

My VR wagon has a problem, when I stop the engine, then restart after a short while it coughs and chokes and blows black smoke. Once all this is clear it runs fine. I would say I am getting fuel into the engine after it stops either by leaky injectors or control valve. A mechanic mate said check the control valve (is that what you call it, the small device with a fuel hose and vacuum line attached). I pulled off the vacuum line and there is fuel in there so I am guessing there is a hole in the diaphragm and leaking fuel back into the engine. If the car sits for a day it starts fine, so I guess that all the fuel has dried up.
OK, I want to change the small device that sits on the end of the fuel rail, I took off the two bolts on top, what else do I need to undo?? See pics, the blue arrows show the bolts I have removed, the red arrow shows the suspect device.
Any help would be appreciated to make the job easier, looking at it done the correct way it should not be that big a job.

[hako]

That's the fuel pressure regulator....I'm not sure on a VR but I think you have to buy the regulator with the fuel rail....however as you need a new one, buy that first and you will know for sure. If so, you'll need to disconnect the injectors as well.

[ozengines]

After removing the two bolts on top of plate (see blue arrow on pic) what else do I need to do after disconnecting the hoses. Do the three injectors just pull away?? or is there more to it

[strgas]

simple unbolt the reg and remove from the rail , replace the oring install the new reg . turn key on check for leaks ..

[darthdingas]

If it is not the FPR (fuel pressure regulator) it could be an injector happened to me before. pull the fuel rail off with injectors attached and place a bit of cardboard (old case box) on the manifold leave it for a while if the cardboard is wet with fuel locate the injector and replace it.

[LeeoD]

Definitely sounds like a dribbling injector.To do a simple test for fuel dilution of your engine oil ,do this: Pull out your dipstick and place it on some ordinary kitchen paper towel for a minute or two. You should see two distinct different coloured wet spots around the tip of the dip stick because the fuel will be absorbed by the paper faster and travel further than the oil will. Your sump oil is going to need to be replaced cause the fuel dilutes it and turns it to like water and then your engine components wear out. Hope this helps.

[westbad]

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[LeeoD]

lol a leaking injector wont leak in to your engine oil mate.. it will just drip fuel direct in to the port/cylinder hence the black smoke on start up....

So your the mechanic by trade are you ? No, your a spray painter. I take my car to spray painters for engine advice. Go ask one. Don't listen to me. What would I know. So your saying that the valves never open or close on an engine to allow fuel into the combustion chamber. Wonder how it gets in there then ?. Magic ? Also, fuel can not make its way past a set of rings. Since when have Holden been putting gapless rings in commodore engines, einstein ?. Maybe your 800th post may show some sort of intelligence. Try and help out a brother and some expert thinks he knows everything. I offer good 20 year + experienced advice. I don't care if you believe it, but don't make me out to be a dummy cause I may become your nemesis. Every post you make I will critisize it, even though by some miraculous chance you may be right one day. Your just jealous cause my car is better than yours !! Ha LOL The reason its fine over night is because th fuel has made its way into the sump through the cylinder bores champ !!

[darthdingas]

I totally agree!!! like i said i had the same prob dribbling injector and guess what fuel was in the sump!! how went past the piston rings! why fuel thinner the oil!!! fuel mixed with oil = black smoke!!!

[Jesterarts]

Fuel mixed with oil = black smoke since when?

Black smoke = unburnt fuel, car running rich. So the diagnosis of a leaky injector could be correct as the injector would dribble FUEL into the cylinder and this would cause sputtering and black smoke. The confimation could also be fuel getting into the oil as people have mentioned which is really not great for your engine.

Blue/Grey smoke = oil getting into the cylinders. This could be causes by perished gaskets, value seals etc.

White smoke aka steam = condensation in exhaust on cold morning and if it's still going after the car is warm then it's water in the combustion chamber. So head gasket, etc.

Anyway, moreal of the story is that black smoke on startup AND fuel in oil are symptoms of a leaky injector.

In terms of a solution, my first point off call would be an upper engine clean and injector clean, might jsut be some carbon build up causing the injector to malfunction.

Beyond that, injector replacement might be the go.

[darthdingas]

The oil becomes thinner and is able to move it the cylinder where the fuel gets burnt off and untill it all evaporates when the motor heats up ! i will say it again i had the same problem

[Jesterarts]

I'm not saying you didn't, and everything you said was spot on apart from the bit about oil in fuel burning black.

And you where correct in diagnosing the most probably problem based on the symptoms.

But the specific cause of the 'Black Smoke' symptom is unburnt fuel and not oil burning off.

Trust me, had plenty of experience with smoke colours working on and driving my car.

You can google it if you like. Black some = too much fuel, blue smoke = oil burning.

[darcycammo]

i every one i have a problem kind of the same but mine is on a VS the first fuel injector behind the alternator is leaking like a tap plz help as i cant work out how to stop it

[VR_Acclaim]

With fuel in the vac line IT IS the regulator mine has done the same.. U can buy them seperate at Holden