Power and ground
The pump’s fuse, relay or control path, supply and ground are checked where accessible. A silent pump can still be a wiring or control fault.
Fuel-delivery diagnosis
Fuel Pump Diagnosis & Replacement in South London
A non-start, cutting out or loss of power does not prove the fuel pump has failed. SP88 checks electrical supply, command and available fuel-delivery evidence before recommending a suitable pump repair.
South London & nearby SurreyWeekdays: 10:00, 12:00 or 14:00Weekends closed
A fuel-pump fault should be proved first
Petrol and diesel systems differ, and some vehicles use more than one pump. The correct test plan depends on the engine, symptoms and available access.
Fuel-delivery evidence
Available pressure, flow, scan data and symptom evidence are considered without opening a high-pressure system unnecessarily.
Filter, tank and contamination
A restricted filter, empty or contaminated tank, damaged pickup or blocked line can mimic a failed pump and may change the repair plan.
Correct pump and access
In-tank modules, lift pumps and engine-mounted high-pressure pumps are not interchangeable. Parts and access are checked against the vehicle.
How the visit works
Share the symptoms
Tell us whether the engine cranks, starts and stalls, loses power or has warning messages.
Test the likely circuit
SP88 checks available electrical, scan and fuel-delivery evidence before condemning a pump.
Agree the repair route
Accessible low-pressure pump work may be mobile; tank removal or high-pressure-system work may require a workshop or specialist route.
Fuel systems need controlled handling
Do not repeatedly crank a vehicle if fuel is leaking or there is a strong fuel smell. Move people away from ignition sources and call for advice. High-pressure diesel systems must not be opened casually.
Mobile where suitable, workshop when necessary
Diagnosis and some accessible pump replacements can be mobile. Tank removal, contaminated fuel, seized fittings or high-pressure diesel faults may need workshop equipment or a specialist repair plan. A booking is not a promise that every pump can be fitted roadside.
Questions customers ask
Does a non-start mean the fuel pump is bad?
No. Battery voltage, immobiliser control, ignition, crank signals, wiring and fuel quality can produce similar symptoms.
Can you replace an in-tank pump mobile?
Sometimes. Access through an inspection panel can make this practical; other vehicles require the tank to be lowered in a workshop.
Do you replace common-rail high-pressure pumps?
These need careful diagnosis and contamination checks. SP88 can assess the fault and confirm whether the work is suitable or needs a diesel specialist.
Will a new pump fix contaminated fuel?
Not by itself. Contamination may require the tank, lines, filter and other components to be cleaned or replaced.
Send the vehicle details before booking
Include the registration, make and model, postcode and the symptoms. That helps SP88 check likely access, parts options and whether the first visit should be mobile diagnosis or workshop work.