I am one of those unlucky people who has a 2.2 Signum which has undergone virtually an entire fuel system change. So far:
1 x swirl flaps and stepper motor
1 x Fuel Pump
4 x Regulators
Had the modified fuel regulator fitted earlier this year after yet another failure. Was told this one had been modified by Vauxhall and would not fail and that there had been no failures of this unit.
Well earlier this month I returned from holiday, put the car on the drive, got changed to goto a wedding, and then went out to the car and it failed. EML on, power goes, then it won't start, just cranks over. Thought possible flooding, so left it till the next day. Runs fine again.
Go to Birmingham with work last week and runs fine all day, driving back and get caught in a bit of traffic by the M4 and low and behold the EML comes on again. Take it steady the 20 miles back to my house, turn off engine and restart. All works ok, but don't take it out.
Went out on Saturday, got caught in a bit of traffic on the M3 and the EML once again comes on. Take it around 70 around the M3/M25 to get back home, and for some reason get 40MPG out of the car (I've never gotten 40MPG out of the car!) Led me to think the swirl flaps has stuck closed, leading to the reduced fuel cons, got it home, left it running for a couple of minutes, then moved the car to reverse the car and it stalls. All power goes, and it won't restart, just cranks.
took it to the garage this morning and overheard the guy in front of me with a Vectra. His car had the same problem, and had similar problems before. Booked mine in and told him the problem, to which he said "yeah, sounds like the fuel regulator, the gentleman behind has the same problem. Had two failure last week, and more than likely it is the same problem. The modified fuel regulator doesn't seem to have fixed the problem, and it's just overheating."
Looks like all that denial by Vauxhall of a problem with the regulator, which they have modified, is still present. Seems to be the same problem, the weather is hot and it's overheating. Seems like this may be a recurring problem over the summer, and the failure rate of the new unit seems to be higher than the old one.
Everyone beware! I've still to find out what is wrong with mine, but my instinct is going to the regulator again. This could be an uncomfortable summer for Vauxhall. I've already decided to sell mine next week and get something that works!
Good luck everyone