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Old 12-04-2008, 12:58   #1 (permalink)
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Smile fiesta fuel pump question

hi, my daughter has an s reg fiesta 1.3 finnesse one morning, she went out, started fine,she popped in the house, when she returned to her car, it turned over but did not fire,
heres what we have tried.
fuel cut off switch.
all fuses and relays checked
diagnostics - showed no codes/faults.
when fuel is put directly into the chambers (remove spark plugs and put it in) it fires.

when the ignition is switched on, there is no sound from the fuel pump.
reading through some posts i found this posted by whittybobop...



If you look at the fuel pump in tank, or the plug going onto it, there should be 5 pins going to it, a row of 3 pins and a row of 2 pins on the row of 3 pins the left and right are the pump only.
Using a test meter check the 2 pump wires for voltage, if you want to test the pump only power up the pump via these two wires the one on the left will be positive and the one on the right is negative.

For anyone else who wants info the plug wires are as follows:-
Top left = Positive feed pump.
Top centre = Fuel level indicator.
Top right = Negative feed pump.
Bottom left = Fuel level indicator.
Bottom right = Earth to fuel pump housing.

would this be the same for the fiesta?
have sourced a used pump for £20 as new is around £200
any help would be most welcome. many thanks in advance.
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Old 02-22-2009, 13:53   #2 (permalink)
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Re: fiesta fuel pump question

first of all you must see if the injector rail is pressurised! the best way to do this is to get a bike tire pump, the flexable part that screws onto the tyre valve is the bit you need! next look at the injector rail, to the left there should be a small blue tyre cap on the end of it! screw the hose onto it, fuel will dribble out, catch it into a bottle, turn key to possition 2 and if the pump is good it will come out at hi speed! if this doesnt happen then we do test 2! there is no need to get under the car for this test, or drop the tank off to get to the connector! the wires are under the back seat! take seat out and you will see a black sheethed wire going from left to a seal plug some ware in the middle of the floor where the seat should be! carefully with a sharp knife cut away a few inches of the sheeth so it exposes the wires inside, be carefull not to cut through them! there will be a black and a red wire and they will be slightly thicker that the others! get 2 dress pins and push them through the black and the other through the red wire, this will now be your test point! connect a 12Volt bulb to you test point and turn key to poss 2 if the bulb lights then its the pump! if it does not then test 3! remove bulb from test point and connect a brand new energiser (good make) 9v square battery to your test point making sure red + black - and you should hear the pump run! if this is the case then you must look at the wiring of the car for faults relay maybe! good luck dont forget to put a bit of insulating tape over your wires when you remove the pins after finish!
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