Starts but dies out immediately.

[Pete-speed]

[have replaced all fuel flow related parts and filters pump, relay etc. bike will start briefly , seconds then dies and successive tries get worse until it sits for awhile. Feels like a fuel starvation problem but got flow through the pump. Anybody have any insights?

[Billy Bananahead]

Longshot, is the side stand kicked down or kill switch engaged?

[Pat Conlon]

"It Starts, runs for seconds, then dies..." ....sounds like a misbehaving fuel pump  or something impeding fuel flow....keeping the carbs fuel bowls from refilling.
Is your tank clean?
Try bypassing the fuel pump and fuel filter. Take them out of the equation.
You need 1/4 tank of fuel to get enough head pressure to gravity feed the carbs.

Welcome to the forum
Try and post in the Intro section, tell us what you're doing.
Modify your profile, In your signature line put in the year FJ you have. That info. will appear automatically so you don't have to remind us.

Cheers. Pat