place to start looking would ne greatly appreceated
car stalls instantly when headlights are turned on

The 2005 Toyota ECHO saw no significant changes in its last year of production in the US. The slow-selling sub-compact was due to be replaced by the Yaris, which would be released as a 2007 model.
The 2004 Toyota ECHO came in two body styles, a two door and a four door. Both shared a 108-horsepower 1.5-liter engine. It came standard with a five-speed manual transmission, and a four-speed automatic was an available option. Fuel economy was excellent, about 31/38 mpg.
The 2005 ECHO was appreciated by many as a good, reliable, basic car, though it didn’t come with a lot of frills (even power windows and locks were optional.) Those who complained did so about its lack of power, cheap interior, and lack of stability in the wind.
car stalls instantly when headlights are turned on
I first noticed the rear seat was soaked around the seatbelts (where they come up from underneath the seat). I dried the seat out with a space heater but the moisture keeps returning and now the rear floor is soaking wet as well. I live in a wet climate.
Since a friend replaced my fuel pump a while back, I've had an issue with starting the car, it's almost as if it's not holding the prime. After the first few cranks I can hear the pump turn on, and then click. Then it will usually fire second turn of the key with the exception of it being -35, then it may need me to prime again. Never 4. The fuel pump is accessible through the back seat, so I'm hoping if it may be something simple I'll try to fix it first before I bring it to a shop. Im not sure where the check valve is located, but could he have done something by accident to that? Ive just quickly looked at it before, and honestly the lid didn't look properly sealed. If someone could please tell me where I should check first, and perhaps save me a bit of time and headache it would be very greatly appreciated. Plus I can't imagine the starter is in much agreement with the current setup lol.
Airbags
Dual front airbags · Front side airbags
Audio System
Single disc in-Dash CD · AM/FM radio
Brakes
ABS: 4-wheel
Convenience Features
Center console: front console with storage · Steering wheel: tilt-adjustable
Locks
Power door locks: remote
Rear Seats
Type: bench
Seats
Front seat type: bucket · Upholstery: cloth
Tires and Rims
Wheels: steel
Windows
Front wipers: intermittent
Airbags
Dual front airbags · Front side airbags
Audio System
Single disc in-Dash CD · AM/FM radio
Brakes
ABS: 4-wheel
Convenience Features
Center console: front console with storage · Steering wheel: tilt-adjustable
Locks
Power door locks: remote
Rear Seats
Type: bench
Seats
Front seat type: bucket · Upholstery: cloth
Tires and Rims
Wheels: alloy
Windows
Front wipers: intermittent