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Posted: Mon Mar 23, 2009 5:25 pm
by stevespickup
I need to replace my fuel pump but how do I know which type it is, the original is missing. After looking at various websites I have found negative earth, positive earth, single points type, twin points type and non polarity
it a 1969 model if that helps, how can I identify the correct part, Regards, Steve
Posted: Mon Mar 23, 2009 5:30 pm
by PSL184
Only you can tell us Steve. Your pick up would originally have been positive earth but many have been changed to negative earth. If you are completly rebuilding / rewiring go for negative earth as this allows for modern electrical equipment to be used....
Posted: Mon Mar 23, 2009 5:57 pm
by alex_holden
The points types work with either polarity. Only the electronic ones care about positive or negative earth. It doesn't really make any difference whether you get single or twin points.
Posted: Wed Mar 25, 2009 12:49 pm
by stevespickup
I have just looked under the bonnet and the negetive lead from the battery goes to earth, the old fuel pump is marked AUA 4080, is this the right pump ?? Thanks Steve
Posted: Wed Mar 25, 2009 3:54 pm
by bmcecosse
If it's working ok - it must be right!
Posted: Wed Mar 25, 2009 10:41 pm
by stevespickup
I have 2 AUA 4080 fuel pumps with the pick up but neither are fitted, the last time this pick up was used was in 1991, it has run since then but this was by gravity feeding fuel into the carburettor, the pump has been removed and the fact there are 2 identical pums would suggest a replacement pump was tried but unsuccesfull. rather than attempting to repair either of these pumps I was going to buy a complete replacement, I thought this would be the easiest and simplest solution until I discovered there are several pumps listed. From all the info you have all kindly posted I think I just need the points type
Regards, Steve
Posted: Wed Mar 25, 2009 11:04 pm
by PSL184
Just buy a standard points type non electronic pump which will work with either pos or neg earth and you'll be fine
Posted: Wed Mar 25, 2009 11:25 pm
by GeoffC
stevespickup wrote: the fact there are 2 identical pums would suggest a replacement pump was tried but unsuccesfull.
If a replacement was fitted and didn't solve the problem, it's quite possible that both pumps are actually OK. If you haven't already done so, I'd test them both before buying a new one.
Posted: Wed Mar 25, 2009 11:29 pm
by stevespickup
Thank ypu PSL184, another one of my daft questions answered. I will get on the phone and order one tomorrow. Best Regards, Steve
Posted: Wed Mar 25, 2009 11:38 pm
by bmcecosse
Don't waste money - just try the ones you have ! Simple points clean and they WILL work!
Posted: Tue Mar 31, 2009 12:54 pm
by stevespickup
Once the pump is rebuilt and refitted is it worth/possible fitting a fuel filter before the pump, the fuel has been drained from the fuel tank but I am concerned about rust/dirt form the old fuel tank getting into the pump, or is the pump quite capable of dealing with this and in which case a filter from the pump to the carb would suffice ? Thank you again, Steve
Posted: Tue Mar 31, 2009 2:22 pm
by bmcecosse
No need for extra filter (it's just something else to go wrong/leak) - there is a filter built into the pump - just check it from time to time.
Posted: Tue Mar 31, 2009 10:02 pm
by stevespickup
OK, Thankyou Bmcecosse
