Fuel Transfer Pump

Moves fuel from one lobe of a saddle tank to the lobe the main pump draws from. Tanks on vehicles with a propshaft or exhaust beneath them are moulded in two halves around the obstruction, and the main pump can only sit in one — so without the transfer the other half is unreachable. Losing it produces the corpus's most distinctive fuel symptom: the car starves with a tank that is half full, and filling up cures it completely, which is why it gets diagnosed as a failing main pump. On many designs the transfer is done by a jet pump driven by returning fuel rather than a motor, and a device with no moving parts has not worn out — check the flow driving it before ordering one.

Also known as: transfer pump, jet pump, siphon pump, secondary fuel pump, suction jet pump, fuel pump b

Referenced by 6 codes

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Codes involving this component (6)

Other components in Fuel Delivery

Information, not instruction

CarGeek is a reference, not a service manual. Its pages are written from public sources and from what other people have found, never from a manufacturer's own service information, so they can be wrong or incomplete for your particular vehicle. Some of what they describe carries real risk: high voltage, fuel under pressure, stored energy, hot and moving parts.

Have anything you intend to act on checked by a trained person against the manufacturer's own procedure for your vehicle. Nothing here replaces that procedure.

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