I have a 1985 Toyota Factory 1 Ton Pickup 22R . Efi . 5 Speed I drove it for years Ok . In December 2006 I drove it throw a deep water puddle & it die'd . It has Not ran right since ! You try to start it . It starts for less the 1 Sec & die's! you let off the key & try to start it again . it starts for less then 1 Sec & die's ! It does This every time you try to start it ! I have replaced the { fuel pump, fuel pump screen , Fuel Filter .Fuel Pump Regulator . } . I took the gas tank off. & cleaned it . { it will run as long as you spray gas in to the Air Cleaner } you Stop It Dies ! today is 4/27/2018 I can find No One That Can Help Me! I have been trying to fix it . Now I will say that 2 times over the years I have got it to start & run till I shout it off ! & it did restart ! But I went out the Next Day ! & It would Start for Less then 1 Sec & Die ! I Love this truck Please Help Thanks George

 

The fuel pump requires one of two things to receive power, either the key must be in the start position, or the air flow meter must register air flowing through it. Sounds like the fuel pump is receiving power when you turn the key to start since it will run for a moment. But once you release the key from start to run, it shuts off because the AFM is not sending the signal to indicate air flow. I'd start by checking the AFM for correct continuity.