Here we are with waveforms
Key on, Engine off. Here we have the old pump (this is where the pump runs for 2 seconds at switch on to pressurise the fuel lines).
..and the new pump
Key on, Engine off (where the pump runs for 2 seconds at switch on to pressurise the fuel lines).
However, we also have some interesting additonal waveforms..
Key on, Engine on (first start after installation of new pump). A few anomalies in the pattern, and also a steep drop off in current after each rotor. Could this just be the rotors needing to wear in?
Key on, Engine on, after a short drive to the fuel station and an elongated route home. Low current points look clean, however at about ¾ current there is an unusual shoulder present on every segment – what would cause this? Approx 5.03 -> 6.77A drawn
Key on, Engine on, with the engine running and additional loads applied (front & rear heated screens, full beam lights & fogs). Wave looks a lot cleaner, and closer to what was expected, although the peaks still seem to be flattened.
Current has now dropped to approx 4.37 -> 5.86 A (based on previous observations this is because the supply voltage will have dropped from the usual 14.4V to now being almost 12V – the Focus doesn’t not seem to cope well with both screen heaters on!).
Key on, Engine on,Taken immediately after previous, but now with the additional loads (f/r heated screens, lights & fogs) switched off. The shoulder has reappeared on the pattern. The current drawn has increased to 4.83 -> 6.38A (presumably as a result of the supply voltage now recovering back to approx 14.4V as the additional loads have been removed).