Fuel tank pump refitting, locking ring won't go back on.

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Posts: 5
Joined: Thu Jan 02, 2020 8:30 pm
Model: C3 2009-2013, New shape (A51)
Year: 2010 (60)
Engine Size: 1.4
Fuel Type: Diesel
Mileage: 80000
Gearbox: Manual 5 speed
DPF: Yes
Engine name: DV4 diesel (70 PS)
Has thanked: 1 time


After removing a fuel pump from a diesel 2010 C3 the locking ring would not go back on, the problem being the tank has deformed due the ethanol in the fuel, its like trying to fit a ring that is 2mm to small, or the ring is metric sized and the opening on the fuel tank is british standard, it feels like your trying to cross thread the locking ring, the opening on the tank has changed shape and is slightly oval so the ring doesn't want to go back on, citroen are aware of the problem and recommend a new fuel tank as a fix (cheers citroen) the only solution is to fit a new fatter o-ring and blue hylomar sealant (it's the only one that is fuel/ethanol resistant) o-ring size is inner 125mm + 6mm thick, it's not ideal but its about as good it gets, ive tried new locking rings and new o-rings but still the fuel leaks, the misshaped fuel tank opening can not be fixed, , the attached diagram shows the locking ring (no3 & no4) o-ring. Before I removed the fuel pump it was not leaking I removed it to fix a faulty sender unit, wish I didnt bother now and just put up with a fuel gauge that didnt fill the last two segments to say full, so if you have a faulty fuel gauge think twice about removing the pump from a plastic fuel tank. . .Good luck if you have to. And bring back steel fuel tanks citroen.

Citroen C3 fuel tank locking ring fitting
Citroen C3 fuel tank locking ring fitting
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