Fuel Leak - Page 2

FLYER · 24th July 2013, 22:15

i had this on my first 75 , it followed some work done on the injectors , the olive ends of the pipe going into the injectors are a soft alloy and if overtightened dont seal properly , the cavities at the injectors will then fill up as the leaking one overflows into each one .

just a thought .

Jakg · 24th July 2013, 22:22

Quote:

Originally Posted by FLYER

i had this on my first 75 , it followed some work done on the injectors , the olive ends of the pipe going into the injectors are a soft alloy and if overtightened dont seal properly , the cavities at the injectors will then fill up as the leaking one overflows into each one .

just a thought .

IF thats my problem, how'd you fix it?

FLYER · 24th July 2013, 22:43

Quote:

Originally Posted by Jakg

IF thats my problem, how'd you fix it?

in my case a new pipe to the injector solved the issue , item 7/6 in the rimmer link by mike noc,

Jakg · 13th August 2013, 06:30

Still no closer to working this out...

I've had another look, even tried using some leak detector spray, can't find it

My Dad suggested that it could be some sort of blockage in the fuel return hose, and that when the engines running it's fine but when the engine stops, pressure builds up in the injector leak off pipes which causes the joints to leak (as they aren't made to hold any pressure).

This sounds possible to me, as my OBC fuel consumption is the same (making me think that it's putting the right amount of fuel into the engine and not losing any before it gets there), and it seems like I'll drive for a bit (and the economy is fine), i'll stop, get in the car the next day and the fuel gauge is a bit lower than I remember.

Does this make sense?

mrvandango · 13th August 2013, 07:24

I think the fuel guage issue maybe a red herring, as every car I've owned has done that.. less fuel reading on the guage after a restart. The ZT is the worst so far lol

HarryM1BYT · 13th August 2013, 09:52

Quote:

Originally Posted by Jakg

Still no closer to working this out...

I've had another look, even tried using some leak detector spray, can't find it

My Dad suggested that it could be some sort of blockage in the fuel return hose, and that when the engines running it's fine but when the engine stops, pressure builds up in the injector leak off pipes which causes the joints to leak (as they aren't made to hold any pressure).

This sounds possible to me, as my OBC fuel consumption is the same (making me think that it's putting the right amount of fuel into the engine and not losing any before it gets there), and it seems like I'll drive for a bit (and the economy is fine), i'll stop, get in the car the next day and the fuel gauge is a bit lower than I remember.

Does this make sense?

Ignore the fuel gauge, they all do that. I find it seems to start low then rises as the engine warms up and mpg improves.

OBC is measured on pressure and injector opening time, so any lost fuel before the injectors will not be included in the measurement.

I cannot think of any leak detector spray for finding fuel leaks?

I would suggest drying out the entire area as a first step, then wrapping toilet tissue round all suspect pipes and joints. If a HP pipe is leaking, keep in mind that the pressure involved could mean the spray might land some distance from the leak, but the tissue will localise it. whichever bit of tissue gets wet first, is where your leak is.

johnny t · 13th August 2013, 11:05

Don't know if this will help but I had a leak on the return side, metal pipe on the front of the engine took me ages to find it was the smallest pin hole and the spray was so fine you really couldn't see it

Charles · 13th August 2013, 11:34

I had a similar problem earlier this year. It turned out to be the "O" ring on one of the injectors which had perished.

Jakg · 13th August 2013, 19:35

Quote:

Originally Posted by Charles

I had a similar problem earlier this year. It turned out to be the "O" ring on one of the injectors which had perished.

Quote:

Originally Posted by johnny t

Don't know if this will help but I had a leak on the return side, metal pipe on the front of the engine took me ages to find it was the smallest pin hole and the spray was so fine you really couldn't see it

These two sound interesting, could you post some more information please?

I'll try the tissue test over the weekend but last time I tried it I didn't really get any decent results

Charles · 13th August 2013, 19:46

Not much I can usefully add to my previous post. I was alerted to the problem by a strong smell of petrol and tried various possibilities to no avail. There was no visible moisture, even after removing the engine cover. Took the car to my local ex-Rover mechanic, who delved further and found one of the "O" rings on the rear fuel rail had failed - it wasn't visible until he started delving!

13th August 2013, 11:05	#17
johnny t Loves to post MG ZT 135+/ MG ZT 260 Join Date: Apr 2007 Location: Chesterfield, Posts: 290 Thanks: 21 Thanked 19 Times in 14 Posts	Don't know if this will help but I had a leak on the return side, metal pipe on the front of the engine took me ages to find it was the smallest pin hole and the spray was so fine you really couldn't see it __________________ [SIGPIC][/SIGPIC]

24th July 2013, 22:15	#11
FLYER Banned rover75 cdti AUTO TOURER 160 bhp. Join Date: Jul 2010 Location: Glasgow Posts: 35,346 Thanks: 2,985 Thanked 3,685 Times in 2,463 Posts	i had this on my first 75 , it followed some work done on the injectors , the olive ends of the pipe going into the injectors are a soft alloy and if overtightened dont seal properly , the cavities at the injectors will then fill up as the leaking one overflows into each one . just a thought .

13th August 2013, 06:30	#14
Jakg This is my second home N/A Join Date: Feb 2010 Location: Suffolk Posts: 6,867 Thanks: 0 Thanked 397 Times in 302 Posts	Still no closer to working this out... I've had another look, even tried using some leak detector spray, can't find it My Dad suggested that it could be some sort of blockage in the fuel return hose, and that when the engines running it's fine but when the engine stops, pressure builds up in the injector leak off pipes which causes the joints to leak (as they aren't made to hold any pressure). This sounds possible to me, as my OBC fuel consumption is the same (making me think that it's putting the right amount of fuel into the engine and not losing any before it gets there), and it seems like I'll drive for a bit (and the economy is fine), i'll stop, get in the car the next day and the fuel gauge is a bit lower than I remember. Does this make sense?

13th August 2013, 07:24	#15
mrvandango Gets stuck in MG ZT, MGF, MX-5 Roadster Join Date: Jul 2013 Location: Dorchester Posts: 501 Thanks: 48 Thanked 45 Times in 39 Posts	I think the fuel guage issue maybe a red herring, as every car I've owned has done that.. less fuel reading on the guage after a restart. The ZT is the worst so far lol

13th August 2013, 11:34	#18
Charles Avid contributor Rover 75 2.0 V6 Connossieur SE Join Date: Jul 2008 Location: York Posts: 183 Thanks: 13 Thanked 12 Times in 6 Posts	I had a similar problem earlier this year. It turned out to be the "O" ring on one of the injectors which had perished.

13th August 2013, 19:46	#20
Charles Avid contributor Rover 75 2.0 V6 Connossieur SE Join Date: Jul 2008 Location: York Posts: 183 Thanks: 13 Thanked 12 Times in 6 Posts	Not much I can usefully add to my previous post. I was alerted to the problem by a strong smell of petrol and tried various possibilities to no avail. There was no visible moisture, even after removing the engine cover. Took the car to my local ex-Rover mechanic, who delved further and found one of the "O" rings on the rear fuel rail had failed - it wasn't visible until he started delving!