Omega Owners Forum

Omega Help Area => Omega General Help => Topic started by: chartz on 27 December 2008, 08:19:46

Title: 2.5 TD better engine running when tank near empty
Post by: chartz on 27 December 2008, 08:19:46

Hello,

How come my 2.5 TD works much better (more power, less noise) when the tank is near-empty ?
At first I thought this was an impression, but no, it does this every time the gauge approaches the red zone.
I'm sure there's an explanation.

Title: Re: 2.5 TD better engine running when tank near empty
Post by: Omegatoy on 27 December 2008, 08:24:46

with diesel weighing around 10pounds a gallon, a full tank would be pretty heavy!! would think its just the less weight is the difference you can feel?

Title: Re: 2.5 TD better engine running when tank near empty
Post by: chartz on 27 December 2008, 08:26:29

Probably not, since the feeling is the same with passengers aboard !

Thanks.

Title: Re: 2.5 TD better engine running when tank near empty
Post by: Pitchfork on 27 December 2008, 15:13:22

Quote

Probably not, since the feeling is the same with passengers aboard !

Thanks.

Overweight passengers?? ;)

Title: Re: 2.5 TD better engine running when tank near empty
Post by: zirk on 27 December 2008, 17:01:49

The Fuel Gauge Needle wieghs less when its pointing in the downward direction?

Title: Re: 2.5 TD better engine running when tank near empty
Post by: omegadti on 27 December 2008, 17:34:04

I would have thought it was something to do with the fuel system.  I would start with the fuel filter and move on to the fuel pump.

Title: Re: 2.5 TD better engine running when tank near empty
Post by: mickfit on 28 December 2008, 10:18:56

Hi mate
          Just one answer i have " If its not broke, don't fix it!!!" :o :o   :y

Title: Re: 2.5 TD better engine running when tank near empty
Post by: chartz on 28 December 2008, 14:28:21

That's usually my motto too. But there's a real problem here I suspect, you can't even imagine the difference. When the tank nears its emptiness (!) it really is another car. The car I used to know in fact. Trouble is, problems like this appear gradually and you don't notice until one parameter changes and reveals it.
Anyway, thanks for your replies.

Title: Re: 2.5 TD better engine running when tank near empty
Post by: Arrolman on 28 December 2008, 14:42:54

Hi,

Mi nes the opposite, runs much better when its got a good tankful. Would try running some injector cleaner throught it and a filter change, difficult to tell unless you can feel the difference im afraid :-/

Cheers,
Iain

Title: Re: 2.5 TD better engine running when tank near empty
Post by: r1 on 28 December 2008, 15:54:24

this seams  a strange one as i cant think of anything that would change apart from the weight in the tank unless the electric pump is a bit weak and with less fuel works harder which pushes the fuel at what it should be at  all the time.so the car isnt faster just working as it should

Title: Re: 2.5 TD better engine running when tank near empty
Post by: chartz on 28 December 2008, 21:49:09

Should I clean the pump then ? The filter is new, and before changing it the engine stalled regularly.

Title: Re: 2.5 TD better engine running when tank near empty
Post by: r1 on 28 December 2008, 22:15:41

Quote

Should I clean the pump then ? The filter is new, and before changing it the engine stalled regularly.

well it wont do any harm its in the top of the tank only takes 2 mins to get at

Title: Re: 2.5 TD better engine running when tank near empty
Post by: chartz on 28 December 2008, 22:17:10

OK, thanks, but it's full of diesel in there... Dangerous ? I daren't do anything, there are electric connectors bathing in fuel !

Title: Re: 2.5 TD better engine running when tank near empty
Post by: Turk on 29 December 2008, 22:03:21

Disconnect the battery...and don't smoke on the job.  Diesel is nowhere near as inflammable as petrol.  

Title: Re: 2.5 TD better engine running when tank near empty
Post by: r1 on 29 December 2008, 22:40:16

Quote

OK, thanks, but it's full of diesel in there... Dangerous ? I daren't do anything, there are electric connectors bathing in fuel !

i think the electric plug is on the outside of the tank u just disconect unsrew the big ring and pull the hole lot out

Title: Re: 2.5 TD better engine running when tank near empty
Post by: dieseldean on 30 December 2008, 00:18:10

four screws to take off plate on boot floor

Title: Re: 2.5 TD better engine running when tank near empty
Post by: Ian_D on 30 December 2008, 13:28:55

Quote

Quote

OK, thanks, but it's full of diesel in there... Dangerous ? I daren't do anything, there are electric connectors bathing in fuel !

i think the electric plug is on the outside of the tank u just disconect unsrew the big ring and pull the hole lot out

Its the petrol fuel pumps that scare me!

The motors are cooled by petrol running THROUGH them  :o

And the motors are not the brushless type either, so surley they must be sparking like a mofo inside?? :-? ::)

Title: Re: 2.5 TD better engine running when tank near empty
Post by: r1 on 12 January 2009, 22:44:43

how are you getting on with this?

Title: Re: 2.5 TD better engine running when tank near empty
Post by: rob in gib on 13 January 2009, 03:30:14

i would also check the tank breather system had same prop on an old car this sorted it out good luck