Sc400 not starting/fuel issue

[MarcoJDM]

Whats up guys! Like the title says my sc400 is not running.

Fuel pump took a crap. Car shut off. Turns over fine. Doesn't sputter or try to start up.

Fuel pump doesn't prime at all and all fuses/relays are good.

I ordered and already changed to a Walbro 255. First try it primed. Turned over. And started.

I drive to work and then it shuts off in my works parking lot. (same exact way it did before)

Drove fine the entire way there but then it shut off and didn't want to start. I have just over a quarter tank.

I heard the fuel pump ecu's go bad but I'm not sure if this is my problem. Clearly the pump or the pump connection is the issue since I changed it and it started fine.


Fuel filter is new

Pump is new. As well as the strainer

I bypassed the fuel pump ecu like I've seen most of y'all do and still nothing

Pump doesn't prime. Car turns over but doesn't start or try to spudder or anything.

Any ideas would be appreciated!

Thanks guys!

Marco

 

[Elliot G]

Ok so to clear this up. Toyota and Lexus vehicles technically do not prime their fuel pumps. They are designed to come on during cranking and then remain on once the engine has started. Its done this way so that when the engine immideatly shuts off for any reason, fuel delivery is stopped. With that said make sure you are getting 12v at the pump when cranking. Another common thing with the 1uz motors are the injector driver caps in the engine ecu like to blow. Its easily checked by removing the ecu and taking the covers off. Look at all the capcitors and look for signs of brown gunk around them. You can replace the capcitors. Im not sure what size they are but my shop foreman over at Lexus does it all the time.

 

[MarcoJDM]

Good looking out! I appreciate the info!

I double checked all my pump connections. And by passed that ecu.

I was re checking all my fuses and relays when I accidentally kicked the interior fuse box and the pump kicked on. So I guess that's where my issue lies. Gonna check all those connections to see if there's any melted or corroded or loose connections.

Hopefully I don't bump into this issue again but atleast I know the area of the problem. Thanks again!