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Petrol pump overall
Posted: Thu May 13, 2004 12:02 am
by millerman
Have just spent 2 hours tryig to get a petrol pump to work to use as a spare. Have followed the Haynes manual especially screwing in the operating rod from the diaphragm to get the correct throw. When connected to a battery charger it dosen't work!
Should I connect to the battery to get a better current to test?
Any advice most appreciated
Posted: Thu May 13, 2004 10:57 am
by rayofleamington
they will (normally) run off a battery charger, but if it's a bit sticky, maybe that's not helping. If it's playing up - it might be a good idea to use a fuse when connecting to the battery!
(although I often ignore that and use jump leads to check out if something works or not
- it's a very bad idea !!)
I had problems when installing new points in a pump (new points but many years old) - the points had a skin and therefore the pump didn't work until I cleaned up the surface of the points with emery.
Posted: Thu May 13, 2004 10:06 pm
by millerman
Have checked using the battery and the pump ticked away merrily! have now got a spare to carry.
pump
Posted: Sun May 16, 2004 6:46 pm
by Willie
It appears that you have a very feeble battery charger!!
Posted: Sun May 16, 2004 6:53 pm
by rayofleamington
A battery has a big capacitance, and is able to deliver a big current spike if/when required - a charger will have a much lower peak current capacity. Now that your pump is chugging (freed up) it may well work on the charger.
Posted: Sat May 22, 2004 10:15 pm
by newagetraveller
A battery has a constant DC voltage output.
The output from a battery charger is full-wave rectified AC
Posted: Sat May 22, 2004 10:17 pm
by Matt
but if it is recitified using capacitors it can be got pretty close to plain DC
Posted: Sat May 22, 2004 10:27 pm
by newagetraveller
That is true.
But I have never come across a battery charger with a smoothing capacitor in it.
Posted: Sat May 22, 2004 10:29 pm
by Matt
Ive never looked...........
Posted: Sun May 23, 2004 5:41 pm
by Cam
Car battery chargers produce a VERY lumpy output full of nasty harmonics which is fine for battery charging but no use for powering audio/radio equipment. They don't have smoothing capacitors fitted as they are not needed for battery charging.