Couple of pics here on something you might want to check on your Omega.
Mine is a 99 V, and seeing that this has corroded through on mine and
some here have older cars than mine, then I consider, reckoning the safety
implications, that it would be worth taking 5 minutes to check yours.
I kept getting a smell of fuel when parked. I finally tracked it down to a very
small pinhole in the fuel pump cover outlet pipe that was spraying a fuel mist
whenever the ignition was switched on.
I went to remove it to see if it was repairable. It was that corroded, it crumbled
off as soon as I tried to remove the first fuel pipe connection.
First pic shows the boot cover over the tank removed with black cover locking
ring next to it. The plastic bags are just where I've protected the open tank and
fuel lines from foreign ingress.
The second pic shows the fuel pump cover with the pressure pipe sheared off.
It was held on by rust and a prayer. Imagine that blowing on you and spraying
fuel at 40psi+ over your hot exhaust.
Could only source a new one from Vauxhall at £118, and even they've had to
send away for it.