Hi,

I just bought a kombi last week which ran sweet until I filled her up yesterday with standard Unleaded. Today when I got her home the engine ran on for about 20 seconds after I'd turned the key. I remembered from the Muir book that this can happen when the octate rating drops so I guess she is set up for Super. Short of draining the tank or changing the timing (no tach-dwell meter yet, and would be first time) is there anything I can do to sort this out (an addtive or something)?

All advice welcome.

Thanks for looking

I would be checking for blockages or fuel pump failure etc etc

my fastie did that when I put another engine in I changed to PULP and checked the timing. It stopped running on after that. But that was my car I would check what vw54 said as well.

Marc

Isn't there a fuel shut off solenoid which is supposed to block fuel flow when the key ignition is turned off? This could be jammed open.

You can buy octane boosters from service stations and FLAPS if the problem turns out to be the type of fuel rather than mechanical. This might help.

It ran on after you turned it off.... hmmm.

Super grade petrol is a thing of the past (unfortunatly ) I would run it on Premium Unleaded if possible (always run a car on the best quality fuel - for the extra 20 - 30 cents a tank, its worth it). I have had the same problem recently with my bug. I had to fill it with Standard Unleaded fuel as the only servo in the town that I was in at the time had a problem with their Premium pumps. If you plan on using Premium in the future, just use what you have in the tank now, then refill it with Premium. If, on the other hand, you plan on using Standard Unleaded, you should look at re-timing the ignition.

Don't waste your money on LRP fuel - its no better than Unleaded, just more expensive.

Also, an engine running on can be a sign of the engine getting too hot, which could be caused by any number of things - make sure that you don't have any vacuum leaks in the manifold (this would also cause the engine to run rough).

Let us know how you go.

R

Hey there.

Let us know what kind of bus you've got.

I've got a twin carburettor 1800 (1974). There are indeed fuel cut-off solenoids at purpleT3 said. It's easy to check whether they're working... But perhaps you've got a FI one anyway, in which I can't help.

I use premium all the time. The higher octane means it won't ping as much - which is really bad for it.

Let us know, and I'll try to find some relevant posts.

Cheers,
Aurel
(Happy bussin')

I have had running on problems before, it was more related to carbon buildup in the heads because I was running too rich. Fixing up the timing and carbs would fix this

Thanks guys, Plenty for me to look into there. I meant premium (probably showing my age) and I think I'll run her on that from now on. I'll give the octane booster a go and see if that fixes her up before getting into anything else.

She is a twin carbie 1800 aggri so I'll have a look in the book about the solenoids.

Thanks again

(What did we do before the web?)

The octane booster seemed to do the trick, It's Premium all the way from now on.

Thanks again for all the advice, good to know you guys are out there.

Cool, glad that was all it was.

R