Fuel injector test device 12v petrol sealey vs211 operates injectors individually to diagnose fuel delivery problems on petrol vehicles with electronic fuel injection works with engine off and pulse timer may be used with fuel pressure gauge powered by vehicle s 12v battery can be used to locate fuel system faults such as clogged or leaking fuel injectors sluggish or sticky fuel injectors wiring harness faults fuel injector driver signal faults sealey vs211 fuel inject