Fuel Pump

From Citroen SM Wiki

(See also Fuel Pump Cutout)

All SM fuel pumps live in the same place. This is behind the closing panel in the front of the RH rear wheel arch. Carb cars very rarely give trouble due to the low pressure, EFI cars need work here.

Accessing the Fuel Pump, when a leak is suspected

  1. Put the car into high position.
  2. Fit the original prop on the RH and lock the rear suspension in high using the lever in the boot.
  3. Remove the right rear wheel
    1. Loosen the wheelnuts.
    2. Put the car in low, and after it has sunk remove the wheelnuts & RH rear wheel.
  4. Now prop the car with an axle stand or something safe.
  5. Remove the cover (5 bolts).
  6. You will likely find the leak is on the output of the pump down the side of the car
  7. You will need to remove the rear sill cover to get to the pipes.
  8. Replace the outer woven sheath section of pipe with modern fuel injected purpose pipe.
  9. Check
    1. the clamp condition
    2. the hoses on the return pipes
    3. the specially moulded fuel pump intake pipe.
  10. While you work in this area...
    1. Open the boot
    2. remove the spare,
    3. lift (from the front edge) the boot lining
    4. remove the tank cover plate in the centre.
    5. Check the two rubber connecting hoses. 'It is recommended that you replace both as you will find they are no longer first class even if they look good.
  11. Fix all the pipes
  12. Run the car to test for leaks
  13. If all ok put it all back together.

Many cars will have corroded covers, so buy new or repair.

The original carburettor fuel pump is a widely used type, available anywhere. A possible replacement is a Purolator 60SV fuel pump. See http://rvfrepresentaciones.com/goldflo.pdf

The EFI pump is specific and no longer available. It is however relatively easy to engineer in most current fuel injection pumps with a 30 PSI rating.