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Post by p5coupepaul on Mar 26, 2017 7:55:52 GMT
does anyone else have problems when filling up at a petrol station
once nozzle is in I can only put in approx pounds worth before it clicks.
bit of a bind if your trying to fill tank up ?
any recommendations please
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Post by enigmas on Mar 26, 2017 8:41:39 GMT
Air has to move out of the tank as you're filling it (displacement) with liquid (petrol). Pull the gun out a bit so air can pass unrestricted and don't trigger the gun as hard until you get a feel for it.
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Post by p5coupepaul on Mar 26, 2017 9:18:47 GMT
thanks for info
im off for a run in my p5b shortly so will try it out
thanks again
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Post by Eric R on Mar 26, 2017 11:21:33 GMT
i experienced this when i first bought my Mk1 3-litre. Some months later i went to clean the overflow pipe to find a skin of paint over the top. The air breather was similarly capped off and i found it much easier since, but not as fast as my modern. Current fuel pump diameters can choke the host car tank.
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Post by harvey on Mar 26, 2017 13:48:22 GMT
Hold the nozzle with the trigger over the bootlid and the handle pulled towards the side of the car so the fuel goes in in a single smooth curve.
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Post by p5tgc on Mar 26, 2017 17:05:23 GMT
The fuel filling system on the P5b is not as simple as one may think, neither in relation to the route taken by the liquid fuel going into the tank, nor the venting of the tank itself.
Taking the latter of these first, as fuel is sucked out of the tank it has to be replaced by a similar volume of air, otherwise the tank could collapse. To achieve this, there is a vent pipe which follows a circuitous route from the tank to the underside of the car, using quite small bore piping. This system is quite adequate to allow air into the tank at the same rate as liquid fuel is used up during normal running; however it is nowhere near adequate to allow air out of the tank at the same rate liquid fuel is being flowed into the tank from a roadside fuel dispenser.
To vent the tank during fueling, Rover designed the inlet pipe as a system of two concentric pipes, arranged such that the liquid fuel goes in down the smaller bore inner pipe, and air from the tank is vented out via the annular gap between the small bore pipe and the much larger bore outer pipe. This arrangement is shown in the parts book on page 1561, but it is not made clear that the plastic pipe (item 33) actually sits inside the items 31, 30, & 31.
The problem of slow filling is possibly due to the inner pipe having disappeared, dissolved, or fallen off the filler neck (it is not easily seen to be honest), and the only way to fix this situation is to replace it. Getting the right plastic pipe is difficult, and getting it fitted inside the bendy bits and flexible joints is , well, educational!
The converse of all this is that if the small bore venting pipework from the tank to the underneath is blocked, this will have no effect on the ability to fill the tank up, but will create problems as the tanks contents are used during travel, due to a build up of a vacuum in the tank.
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Post by lagain on Mar 26, 2017 19:44:39 GMT
This has always been a problem, thankfully now the pumps are very sensitive and cut out, years ago the fuel would slosh back and down the side of the wing, very irritating.
If you look inside the boot you can see where the pipe goes and the nozzle needs to be pointing in the right direction. It also helps if the car is facing downhill.
It will never fill at full speed as the curves of the pipework prevent it. So it can take a long time to fill. Never fill to the very top as if you do when you come back from paying there will be a puddle underneath !
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Post by djm16 on Mar 27, 2017 15:11:17 GMT
I may be wrong, but I believe that these days petrol is delivered with a high volume of nitrogen bubbling through it I presume as a fire retardant. This extra gas also has to vent.
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Post by johnwp5bcoupe on Mar 27, 2017 18:29:00 GMT
They have always been bad fillers I can go back to the early 70's and they were just the same  |
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Post by Warwick on Mar 28, 2017 2:23:23 GMT
I may be wrong, but I believe that these days petrol is delivered with a high volume of nitrogen bubbling through it I presume as a fire retardant. This extra gas also has to vent. No, that's not correct djm. But I'm curious to know where you heard or saw that. I haven't heard it before. |
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Post by ray on Mar 28, 2017 11:37:03 GMT
Again this is just part of the ownership of classic cars. These always take fuel slowly, why do you want to rush it? My belief is that the filler tube is corrugated inside and so there is a great tendency for the fuel to 'cascade' round the pipe and cause 'blow-back'. Just hold the trigger lightly open, so the delivery rate is slower ...and enjoy the experience! There should never be a rush when enjoying a P5  |
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Post by djm16 on Mar 29, 2017 4:31:12 GMT
Yes I was wrong about nitrogen being used as a retardant in petrol stations. I must have subconsciously conflated this with the systems used in planes fuel tanks. I have noticed however that modern petrol pumps, in contrast to pumps I remember in the 70s deliver petrol that is bubbling (hence my error). Now I look at it, I suspect that the bubbling is caused by the VR2 vapour recovery systems used in most pumps.
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Post by roverp5saloon on Mar 29, 2017 9:16:16 GMT
Nice to know I'm not the only one with that problem. We've had Annabell (our 1970 Saloon) for 20years.
Odd considering she loves a drink how difficult it can be to fill her up.
I've found that here in Germany some petrol stations don't cause as many problems, maybe they use less pressure.
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Post by OlafR on Mar 29, 2017 10:39:36 GMT
I can subscribe to that. Some petrol stations seem to work better than others. Don't see a pattern there, sadly.
Cheers,
Olaf
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