1. Remove pressure from fuel system. Pull fuel
pump fuse and run car until it stalls out.
2. Remove spare tire cover to gain access to black panel in
trunk.
3. Remove black access panel
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3. Remove black access panel |
4. Disconnect wiring harness and two fuel lines.
If you car still has the factory pump you are going to need
to cut the clamps off. Make sure you mark the hoses; if you
switch the feed hose with the return hose you will have a problem.
5. Spray the 10mm bolts with WD-40 - Wait few minutes and then
remove them.
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6. Carefully remove the sending unit; it is attached
to the pump which sits down in the bottom of the tank.
7. There are two plastic tabs that secure the fuel pump to the
housing mounted to the bottom of the tank. The tabs are on the
left and right sides of the pump, if you squeeze them it should
release the pump and allow the entire assembly to be removed.
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8. Remove the electrical connections and cut the
factory hose clamp off the old fuel pump. |
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9. The fuel pump itself is help in by four rubber
bumpers. Carefully pry the unit out of the plastic holder.
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10. Install the new pump into the housing and
restore the electrical connections. Some fuel pumps may not
have the pulsation unit on the top of the pump, do not be alarmed.
Attach the main feed hose to the fuel pump and secure with a
hose clamp. Try to orient the main feed home in a similar fashion
as the return line. This will prevent a kink when it is reinstalled
in the tank. |
11. Install the pump assembly back into the holder in the
fuel tank, followed by the sending unit.
12. Tighten 10mm nuts in an even pattern. Do not over torque.
13. Connect fuel feed and return lines. Use new hose clamps.
Connect electrical plug to fuel pump assembly.
14. Change fuel filter. Replace hose clamps if they are rusty.
15. Start car and check for leaks.
16. Take car for short test drive and recheck for leaks.
17. Oil 10mm nuts on top of fuel pump and put some engine
oil on the fuel inlet tubes. This will help to prevent any
further corrosion.
18. Replace access plate and install truck trim pieces.
Download the 525it PDF
fuel pump replacement Thanks to Dave O in WA.
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