Thread: How accurate are servo pumps?

hi
dont know about the d1, but the d2.....you can often put at least about 4 to 5 litres more in it after the pump clicks off.have dribbled 95 litres in mine& it was not empty
also pump flow calibration....is it done at full flow or at different flows?

if you dribble fuel in,particularly diesel,it can get frothy.will this affect the calibration of the pump?

cheers

Originally Posted by scarry

....also pump flow calibration....is it done at full flow or at different flows?

if you dribble fuel in,particularly diesel,it can get frothy.will this affect the calibration of the pump?

cheers

full flow, looped back to the main tank and gas/air/bubbles in the line don't affect it...

Originally Posted by p38arover

I also complained (to the servo) about another Woolies Caltex servo. I had been running a particular LPG tank for a couple of years and I alway ran it "dry". I consistently got 54 litres in to it (+/- 0.5 litre). Yet at this Woollies servo on Epping Rd, I got significantly more (about 6 litres). They denied their pump could be faulty.

Ron,
With lpg it all depends on the day and weather. I know in my Rangie on a hot day I would get 100-105 litres in from bone dry. On a freezing cold morning at 0430 often would get 120 litres in. There is also some expansion in lpg itself so on a hot day you may get a little less than you think and on a cold day a bit more. Not much but a bit. I know on a cold morning if I filled up and it was going to be a warm day I would only fill until it was one bar under full and when I would come out in the arvo after sitting in the sun would show full. Same happens with petrol to a lesser degree due to specific gravity and expansion rates. Normally within guidelines, so a pump may in fact be giving you the right volume, but when it cools at night may be a bit less.

BUt it's going in as a liquid, not a gas. The shut off is a float valve, not a pressure valve. (I know 'cos I've pulled them out. If you adjust the float you can get more LPG in. Seriously, I was once told that by an LPG fitter. I haven't done it.)

Originally Posted by CraigE

Ron,
With lpg it all depends on the day and weather. I know in my Rangie on a hot day I would get 100-105 litres in from bone dry. On a freezing cold morning at 0430 often would get 120 litres in. g in the sun would show full. Same happens with petrol to a lesser degree due to specific gravity and expansion rates.....

Yes never buy LPG from a servo with an above ground tank on a hot day, you get less bang for your buck.

Petrol expanding, isn't that why servos try to get their deliveries at night so they get what they are paying for?

Diana

Originally Posted by scarry

hi
dont know about the d1, but the d2.....you can often put at least about 4 to 5 litres more in it after the pump clicks off.have dribbled 95 litres in mine.

cheers

So, at least I am not the only one.

Same thing happened to me...

From memory in our F250s you could dribble fill another 13L or so after it clicked off. Think they had a 120L tank.

In my Disco1 with LPG manifold floor tank I can only usually fit 45-47L when it is totally empty. Sometimes 55L though. I thought it was a 55L useable tank. Never taken any notice of temp etc when it happens but it is annoying considering how small the tank is to begin with.
If it does only get 45-47L it drops from 4 lights (max lights) to 3 lights pretty quickly so obviously not full. I suspect the float shut off is faulty but I'm just guessing.

Originally Posted by p38arover

If you adjust the float you can get more LPG in. Seriously, I was once told that by an LPG fitter. I haven't done it.)

i wouldnt do this as on a hot day the pressure relief on the tank may go off

now that would be exciting