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It is under the fuse box/battery tray.
Yes, it can rule out an actual leak as a cause for a fault code and can be used to see if the pump itself is leaking.
Trouble code P1495 means: Leak detection pump solenoid circuit
Yes, should be located under the fuse box under the hood.
A solenoid in the leak detector pump
When a water pump is bad it will leak. There is a hole in the pump were water will leak out of.
Trouble code P1494 means: Leak detection pump pressure switch or mechanical fault
Yes, the water pump can leak if you do a coolant flush.
yes and no, if the water pump seals are bad antifreeze will leak from the weep hole on the water pump, but it is possible for the pump to go bad and not leak at all.
Yes a mechanical cam type fuel pump can leak out the breather hole on the bottom of casting of fuel pump
Non, replacing a water pump will not cause a hose to leak.
The rollover valve just prevents a fuel leak if the vehicle is upside down. It does not disable the fuel pump. The rollover valve is not by-passable.