Deleted
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Post by Deleted on Jul 10, 2007 10:40:26 GMT
I notice that electric fuel pumps are the order of the day for tired old P5B mechanical fuel pumps. What is the most common position for mounting them? I have seen that johnw mounted his down near the transmission. Any suggestions for the best position and if their really is the need for an oil pressure switch cut out? The manufacturers suggest close as possible to the tank as the pumps are better at pumping than sucking the fuel.
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Post by DaveCole on Jul 10, 2007 12:56:49 GMT
I have just fitted an electric pump, facet type. I fiitted it under the floor, behind front subframe drivers side. The floorpan rises up for the drivers seat so it is clear of the road humps etc. You then connect fuel line before reserve tap, heaven forbid you would need it. No need for oils pressure cut out, I used a second hand trembler type resettable electrical switch for a Rover 400/45 fitted to bulkhead between fusebox and heater box fed from fusebox ignition terminal and then to pump. To keep the fuel line to filter tidy I took out mechanical pump, removed lift arm (be sure to replace pin) and inlet valve (the outlet valve prevents fuel draining back to tank) and re-attached, leave the diaphram and spring in place, this acts as a gasket. It then just becomes a junction box and looks 'original '.
I hope this helps
regards David
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Post by johnwp5bcoupe on Jul 10, 2007 14:21:39 GMT
I fitted mine where it is because the pump is just after the reserve c/o valve and very little effort in making up the fuel line being below the tank level once the line is primed you get the syphon effect and the pump is always primed I know Ely Service fit them in the engine bay!!! If you fit the pump in the boot you would need two to give you your reserve if you don't want this then one will do
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Post by glennr on Jul 10, 2007 15:34:29 GMT
I have no reserve and only one pump which is fitted in the boot. All I do is watch that dial like thing that goes down rapidly sometimes and carry some spare fuel in a petrol container.
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Post by Deleted on Jul 10, 2007 16:04:51 GMT
I removed the mechanical pump and made a blanking plate to fit where the pump was. Then fitted Facet solid state pump on the inner wing of the engine bay close to where the old pump was for ease of fitting the fuel lines. Easy access was important for fitting and any repairs (if required.) Should it fail at all then in an emergency it would be easier to bypass etc than if it was under the floor or by the gearbox. So far, very pleased with it, engine starts better than ever!
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Post by Phil Nottingham on Jul 10, 2007 16:37:28 GMT
Agian this has been covered before so use Search for otehr alternatives and pics.
I have done what Freddy has so I can keep the reserve facility which is very useful and also revert to a manual pump in a emergency very quickly.
Wherever its mounted you will hear it clicking at idling speed though
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Post by glennr on Jul 10, 2007 20:14:16 GMT
I canna hear it in mine I have to say.
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Deleted
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Post by Deleted on Jul 11, 2007 13:40:43 GMT
Dave what is a trembler type resettable electrical switch? Is it safe just to have it connected whenever the ignition is switch on?
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theroveringmember
Rover Fanatic
P5B Saloon - P4 110 - P6B x2 - 2200TC - 2000TC (S1) 2000SC........How Many Is Too Many?
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Post by theroveringmember on Jul 12, 2007 4:07:56 GMT
There should be some sort of cut-off device so the pump doesn't keep pushing petrol through in the event of an accident.
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Post by DaveCole on Jul 12, 2007 12:16:28 GMT
Tjh
Most modern cars, particularly those with high pressure fuel injection are fitted with this device or similar. You may find one for Ford or Holden. The switch trips in the event of sudden impact and cuts fuel supply, no one wants high pressure petrol squirting everywhere after an accident. Mine is a ball bearing resting in a cup between 2 contacts, crash and the ball falls off. That simple but for safety reccomended.
regards
David
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Post by Warwick (Ozcoupe) on Jul 12, 2007 13:06:56 GMT
You can (or at least could) also get one that replaces the main battery positive lead terminal clamp and it isolates the battery in a prang. I put one on my 504 in the mid '80s. Got it from Repco. And there's one under the passenger seat (from memory) of 3.5L EFI Range Rovers. Both types need to be reset after triggering.
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Post by Deleted on Jul 12, 2007 15:27:15 GMT
and could be a pain in the a** if you hit 'sleeping policemen' or speed bumps too fast. The shock would trigger the cut-out and kill the fuel pump when you don't want it too. I know it can happen 'cos the Aston V8's have such a device too. Often a dead Aston could be due to this unit failing.
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Post by Phil Nottingham on Jul 12, 2007 16:21:44 GMT
Another type that is available works when oil pressure in the engine builds up - this assumes the engine is stalled in an accident and cuts out the one main advantage of electric in that if car is left standing the float chambers fill automatically. This one on Ebay is off an SD1 etc 250142445591
A safety device is far more critical in high vloume/pressure pumps used for injectors in modiern cars. After all a lot of BMC cars + P5's + P4's Jags from 1940's to 1970's had electric pumps
Carrying petrol in a can in a boot is far more dangerous in my opinion than not having a saftey cut-off
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Post by Warwick (Ozcoupe) on Jul 13, 2007 0:24:44 GMT
and could be a pain in the a** if you hit 'sleeping policemen' or speed bumps too fast. The shock would trigger the cut-out and kill the fuel pump when you don't want it too. I know it can happen 'cos the Aston V8's have such a device too. Often a dead Aston could be due to this unit failing. Yep, the one on the Pug did that twice but the Rangie never has - maybe it doesn't work!
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