rover3l123
Rover Fanatic
Originally from Llangollen area North Wales and relocated to the US in 1995 with the P5
Posts: 174
|
Post by rover3l123 on May 5, 2012 22:48:27 GMT
My P5 MK11c has a double ended SU fuel pump. The car has been "hibernating" until now and so I tried to get it running today. It would not start but I found that the fuel pump was clicking non stop even though the glass fuel filter is full.
The reserve end of the pump has been that way for a few years and so I don't have the option of changing over to that half of the pump. So I removed the pump and inspected the points. They were in good condition but covered in a dark brown grease. I cleaned them (I have only done one side of the pump and still have the reserve half to do) but it is still clicking non stop even after a clean.
Any suggestions on what to try next. I do not think I have a leak as the car was running fine before last winter and there is no smell of fuel etc under the car or in the boot or engine bay
|
|
|
Post by Phil Nottingham on May 6, 2012 8:41:50 GMT
Sticking valves/grit underneath if sure no leaks including air leaks. No good leaving cars standing
|
|
rover3l123
Rover Fanatic
Originally from Llangollen area North Wales and relocated to the US in 1995 with the P5
Posts: 174
|
Post by rover3l123 on May 6, 2012 14:18:14 GMT
Sticking valves/grit underneath if sure no leaks including air leaks. No good leaving cars standing I assume the sticking valves / grit you mention refers to the fuel pump and not the engine. Excuse this dumb question but I just want to make sure I am understanding your answer correctly. I do have a rebuild kit I purchased from Jonathan Wadhams and so I may take it apart and investigate further. One thing I did notice yesterday when I was testing it is that when the pump was operating, there was air blowing out of a small hole in the pump body. I assumed this was normal as the hole is meant to be there? Given that when on the reserve position, the pump has always clicked like crazy, does it make sense why the main position (other half of the pump) would now do the same if it was a sticking valve / grit. I thought that the double ended pump used the same mechanicals or is this not correct?
|
|
|
Post by Phil Nottingham on May 6, 2012 18:09:51 GMT
Yes to both - double ended pumps have independent valves as independent pickup with common outlet
|
|
rover3l123
Rover Fanatic
Originally from Llangollen area North Wales and relocated to the US in 1995 with the P5
Posts: 174
|
Post by rover3l123 on May 27, 2012 20:50:26 GMT
It was the diaphragm. I replaced it and the pump now works as it should. However, I have another problem which I will post separately
|
|
|
Post by delboy on Aug 6, 2014 7:26:42 GMT
How can I "bench test my double end p5 mk111. Fuel pump.Ie what ends are positive&negitive.and what is the connection in the middle of the pump.thanks
|
|
|
Post by Phil Nottingham on Aug 6, 2014 17:53:37 GMT
Mk3 were negative earth and whilst SU's THEN were dual polarity they have Diodes and Transistors nowadays (since 1990's that is!) Just connect end terminal to + and body to -. Bench testing actual petrol pumping is NOT representative of reliable performance on the car.
Note the diaphragms will have hardened through standing so do not throw the points open - they may soften but also are likely to tear perforate especially with unleaded. You can try unscrewing then 6 scr ews and flex it a bit but it is likely to randomly stop in the future
Rebuild kits are easy to fit - SU pumps go for years and years with 100% reliability but once they start playing up that's it!
Rover had 2 for 120% reliability as long as both were used equally
|
|
|
Post by delboy on Aug 6, 2014 20:41:55 GMT
Thanks Phil. I managed to get the pump going it makes a loud clicking noise but only works on the reserve switch.and there is air coming through. There is petrol in tank about 4 gallons when pump in going I can hear gurgling in the tank?.so I now haven't got a clue.
|
|
|
Post by Phil Nottingham on Aug 6, 2014 21:53:21 GMT
It could be an air leak in the fuel intake lines or the tank pickup in the tank (filter on the end may be clogged too) The valves in the pump may be dirty/stuck. Are the pipes connected correctly?
|
|
|
Post by delboy on Aug 7, 2014 18:07:22 GMT
It could be an air leak in the fuel intake lines or the tank pickup in the tank (filter on the end may be clogged too) The valves in the pump may be dirty/stuck. Are the pipes connected correctly?
|
|
|
Post by delboy on Aug 7, 2014 18:09:02 GMT
Cheers I will strip the tank fittings at the weekend.thanks for assistance.
|
|