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Home >> Lexus >> 1995 >> LS 400 >> Repair and Diagnosis >> External Pages >> Different car >> Section 3 (Engine Controls - System/Component Tests) >> Fuel System >> Fuel Pump Operation (Using Fuel Pump Connector)
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Fuel Pump Operation (Using Fuel Pump Connector)

WARNING: This page is about a different car, the 1995 Lexus ES 300. However, it is still accessible from the selected car via links, so may be relevant.
WARNING: To prevent sparking near the fuel tank in the following procedure, make final connections at test battery.
CAUTION: To prevent fuel pump damage, DO NOT operate fuel pump for more than 10 seconds.

Remove rear seat cushion and seat back. Disconnect 5-pin connector from fuel pump and sending unit assembly. Apply battery voltage across Blue/Black and White/Black wire terminals of 5-pin connector. Fuel pump is operating if pulsations can be felt in fuel pressure hose or if noise from fuel return can be heard.