Print

Please login or register.
1 Hour 1 Day 1 Week 1 Month Forever
Login with username, password and session length

[Kieran]

Hello everyone,
My Omega 2.6 has not started for about a week now. Checked fuel and nothing coming thru. Car went to the garage yesterday for new tyres and exhaust, asked them to fix the non starting. They checked the fuel pump and it was working but still no fuel pumping thru. They checked the rest of the system and it was fine. Eventually they removed the fuel pump cleaned it out and it started. The fuel pump appeared to be clean when they removed it so not sure what the problem was. The thing is the car is going for a long journey to Italy in April and wondering if I should change the pump. Phoned Autovaux and the price is around £120.00. Has anyone had this problem before and had to buy a new pump. Apparently 2.5,3.0 is different.

Cheers

[aaronjb]

Before they cleaned the pump did it pump fuel with 12v across it?

If it did but wasn't pumping when cranking then I'd say crank sensor and the whole pump cleaning thing was just a coincidence..

[Kieran]

The crank sensor was replaced last week as a precaution due to the milage and upcoming journey. Made no difference to the fuel pump.

[amba]

Had a similar problem a few years ago with my old 2.5.

It would not start for no apparant reason and despite numerous test/checks still was a mystery as it would have no pattern to when it didnt start.

Found almost by luck when it wouldnt start if I firmly hit the fuel tank from below almost by miracle it would then start so conclusion was lazy fuel pump.Fitted a new unit ,if I remember it was around £40,and problem was solved and never returned.Quite straight forward job as its located in the boot floor .

Large black nut requires undoing which I found easiest with a peice of wood and gently tapped it around to loosen,although sure their is a special size spanner/wrench for the job.Undo both the fuel pipes and then remove the entire unit with the swirl pot.Undo fixings and remove electrical plugs and then just refit new pump.

Just a word of caution though.The 2 curved metal pipes on the top plate can be very fragile and prone to rusting so unless you intend replacing that part too,or it is badly rusted and needs renewing,be carefull when undoing hose clips as the pipes could easily fracture.I re-newed the metal fuel hose clips with stainless steel as originals seemed to be a 1 fit type and got bent when undoing,although again special tool might of made that job simpler and not required hose clips replacing.

Job took about 1 hour so well within DIY territory

[05omegav6]

The hose clips are same design as breather ones... so tool for them works a treat

[Kevin Wood]

Fuel pumps are generally quite reliable, although I think I've heard of one or two that have failed. On the estate, they can suck air if the car is parked on a slope with a low fuel level. Maybe the act of removing it dislodged some dirt or resulted in an airlock getting cleared?

Was the crank sensor a genuine Vauxhall one from a dealer? Aftermarket ones can be unreliable from new.

Might be worth doing a pedal check just in case there's a crank sensor code (0335 on the DBW from memory).

If you're worried, I suppose an option might be to get hold of a good 2nd hand pump and take it with you just in case. A spare crank sensor is advisable on any long journey too.

[Kieran]

Cheers Kevin

The cranksensor is a genuine one from Vauxhall. The car has about 3/4 fuel in the tank and is parked level. I agree that something may have been dislodged on removal but for peace of mind and considering the car has done 145000 miles with original pump I will get it changed. Can't afford the pump to fail in Italy so it looks like a replacement Bosch unit is necessary. Goodbye to £120.00.

Also done a scan and no error codes showing up. May get a Tech 2 on it before going abroad of you still have access to one.

Regards

[Kevin Wood]

Yep, Feel free to drop by if you'd like me to give it a once-over.

[engineerkeith]

I have got a similar problem, hope someone can help. The engine started then cut out, turns over OK now but will not fire up. Omega is a 2.6 year 2002. Could the fuel pump or relay be at fault?
Which is the easiest fuel pipe to disconnect to see if fuel is being pumped? The crank sensor has been stated by other members to be a possible fault and I have "Banged" the bottom of the fuel tank to free the pump. What is the position of the pump relay?   

[05omegav6]

Either of the fuel lines at the plenum... supply should be about 10 bar, return 3.0 bar... go with the smaller one...

Also saloon or estate and what is the fuel level? If less than a quarter tank and on a slope, level the car, add at least three gallons and try again...

Crank sensor is usually an intermittent fault at first, so it should fire after several attempts with about half an hour between... doesn't always show a code on the v6, which is annoying.

[zirk]

From memory, and I might be wrong, the 2.6 and 3.2 fuel pump will prime but wont pump if theres a crank sensor issue going on. 

Pump relay is one of the 2 Mauve / Pink ones under the Engine Fuse / Relay Box.

[05omegav6]

From memory, and I might be wrong, the 2.6 and 3.2 fuel pump will prime but wont pump if theres a crank sensor issue going on. 

Pump relay is one of the 2 Mauve / Pink ones under the Engine Fuse / Relay Box.

Whilst they can easily be tested by substitution, they have to come from a known working car... one does the fuel pump, tother is the injection master, so if either is toast car won't run... ever