Venting.

[aceman]

The vent pipe only goes to the top of the tank to bleed of any trapped air due to the shape of the tank or the inclination on the car. When the fuel filler cap is screwed back into position it pushes the little vent lever and opens the vent so any pressure can equalise hence allowing any fuel in the filler pipe to drop down into the tank.

I think the original design concept of the little lever was to stop people getting soaked in diesel incase the pump didn't click off quick enough, I am sure most people have experienced this at some time or another with other cars.

 

[sssstew]

thats good to know tornado, as the temps you have over there are much higher than here most of the time.

 

[TornadoRed]

thats good to know tornado, as the temps you have over there are much higher than here most of the time.

Diesel fuel doesn't expand nearly as much as gasoline as temperatures rise. In fact, diesel hardly expands at all.

And the fuel used in the first few miles of driving after filling up (0.2-0.4 liters) is probably enough to drop the level down a couple inches in the filler tube. Further reducing the likelihood of spillage.

 

[prc]

I've never had spillage and it does get quite hot over here...

Besides it's quite hard to get diesel all the way to the top of the filler pipe as you get quite a bit of foam from the diesel going in (granted it's alot less than older diesel fuels).

 

[AndyVTR]

I hate venting.

62.08L = £60.16 and then the pump timed out on me.

 

[sssstew]

pump timed out! blimey! you must have been going to slow

venting is great though.. highly recommended to all newbies reading this thread.

 

[AndyVTR]

Venting has ruined my MPG. I can easily do 600 miles now and end up with 47mpg.

Filled it up normally then held the valve and filled.

Glad it timed out or my wallet might have.

 

[sssstew]

dont see how venting can harm the mpg, in theory it would improve it as you wont have to stop so often for fuel.

 

[dickie]

Venting could possibly lower your MPG slightly if you think about it. More fuel = more weight = less MPG – although having said that I wouldn’t have thought it would add enough weight to make a really noticeable difference?

 

[muddyboots]

I think the weight from an extra few litres of fuel would be negligible...

I always vent but have never had the pump time out. That must have been a serious attempt to get every last drop in, respect is due !

 

[sssstew]

i was thinking about what i said on the way home and only if your doing a big long journey would it save you mpg due to not having to stop off the motorway/autobahn to fill up so often thus maintaining a higher average speed. During normal driving venting shouldnt change the mpg, like muddy says the extra few litres is negligable.

andy - maybe you just had a dodgy tank of fuel, or you caned it everywhere or the traffic was different or the weather was different.

 

[Fl@pper]

and sticking more diesel in means more (possibly) mpg but its also taking more crude to make it in the first place hence putting the price of my optimax up - grrrrrrrrr

sorry - only jealousy ignore my babbling

borrowed and old crap astra dsl van last week to do a 100 mile trip - when i got there i put more fuel in cos i thought the gauge was broke (needle didnt move) even on an old shed with 330k on it

 

[AndyVTR]

Nah you're missing the point. I need 600 miles for my weekly commute. Without venting that means I have to be very careful. Now I can give it a bit more and not worry about running out of fuel.

Might stop venting and try to put 55L in every time so it's more consistent.

 

[MSV User]

Now usually I just fill up the once on a Sunday night and do my 600 mile commute. The pump usually times out before I manage to vent it.

This weekend I fancied a bit of drive so filled her up on Saturday. Topped it up on Sunday night and vented it quite a few times. I now realise it's better to fill it right up the neck then vent it back down again. I managed to get 18L in after doing 62 miles (37.6mpg oops).

Got home last night showing 120 on trip and 605 on range, 55mpg(1).

I've now done 180miles and the needle has only just left the top marker. It normally moves off that at 80miles.

Well impressed.

Im probably being a bit dense here, but how do I vent fill?

Ade

 

[aceman]

Before anyone else says it "do a search", has been talked aboout loads !

 

[MSV User]

Sorry Aceman....long morning...forgot about search

 

[AndyVTR]

Don't do it... devil's work.