Yes, Terry, welding would be first option if it's possible (obviously with the tank empty!). I hadn't thought of using the fuel pump to empty the tank Simon, sounds good idea but with Mike's point taken on board. It's been a long time since I last used a basic tube and syphon method! I've had further checks around to see if I can find a leak above the tank from anywhere but so far have drawn a blank, so at the moment the tank is the No1 suspect but I'm getting a second opinion on Monday before draining off and removing. Paul
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Originally posted by Lingen View PostPaul.
I think there might be a risk of the pump overheating if it was left running flat out for
too long. Keep an eye (hand?) on it just in case.
Mike.
in my experience standard fuel pump cooling is achieved by the cool fuel passing through it, if the pump is likely to fail as a result of it running continuously for 5 mins then I might be inclined to suggest that it is near the end of it's working life anyway. Better fail here than on the M4
also many fuel systems, for some reason this doesnt include the Stag (but does the 1970s Range Rover running strombergs on a Rover v8) have the pump running constantly with a smaller bore return pipe to the tank. This also gets around the higher pressure of modern pumps overwhelming the float valves. and also fuel vapourisation in the chassis line
I would be more concerned about someone walking past smoking a ciggie or maybe a rogue spark with all that petrol vapour hanging around, especially so if working in a garage.
I wonder if the reason so many don't drive their classics in the rain is for fear of wearing out the wiper motors
Stags and Range Rover Classics - I must be a loony
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Richard.
I leave it to you! I agree that the pump part will stay cool with the fuel passing through it, but the magnetic coils that could generate heat, and the points, are away from the pump, and although there are pumps that are designed to run continuously, the SU one isn't. Mine got a bit hot so I siphoned the fuel out through the filler cap to avoid damaging it. That was about 15 years ago, and the pump is still working fine.
Mike.
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Originally posted by Lingen View PostRichard.
I leave it to you! I agree that the pump part will stay cool with the fuel passing through it, but the magnetic coils that could generate heat, and the points, are away from the pump, and although there are pumps that are designed to run continuously, the SU one isn't. Mine got a bit hot so I siphoned the fuel out through the filler cap to avoid damaging it. That was about 15 years ago, and the pump is still working fine.
Mike.Header tanks - you can't beat a bit of bling.
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Originally posted by Jeff View Post
Mine does and as you say, that's why there is a hole in the boot floor to gain access to it.Dave
1974 Mk2, ZF Auto, 3.45 Diff, Datsun Driveshafts. Stag owner/maintainer since 1989.
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Originally posted by wilf View PostI don't quite understand this, surely the SU pump works all the time the engine is running anyway? And at Mway speeds, quite hard?
Using the ROM figure for the pump of 80L/hr or 1.33L/min max flow the duty cycle for the pump is only about 16%!
Pump pulse rate is about 2 pulses/sec at full flow so only will pulse at about 19 pulses/min at 70mph - not much really (assuming my calculations are correct!).
Simon
fuel.jpgLast edited by mallardstag; 19 August 2019, 12:07.
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Originally posted by DJT View Post
Some do, some don't, Jeff. My Mk1 Stag's fuel tank had a drain plug and a rather crudely cut hole in the boot floor to accommodate it. My Mk2 Stag's tank has no drain plug and there is no hole in the boot floor......I only do what the voices in my wifes head tell me to do!
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