KA24de Starts right up and then dies...

[subwayguy4]

Got a KA24de that starts but then dies instantly.

I had it idle for over 4 seconds once when I was lightly spraying brake cleaner into the intake it stayed on as long as that was going...

I've see numerous threads on different forums about this, but none of them were ever answered....so any idea's is appreciated.

this is in a datsun 510 btw and yes the motor and everything previously ran good in the 240.

It has a walboro fuel pump that clearly works well I unhooked the injectors from the manifold and cranked, but I didn't see fuel spray. I'm not sure if it had to be seated to spray or needed vacuum to open up the regulator...so I bolted it back on and it just does the same starts a few seconds and dies

[sirfallsalot243]

Recheck the fuel pump, check the fuel filter, check for fuel pressure, and stop spraying brake cleaner into your engine. Its not the same as starting fluid, and isnt going to fix your problem (not that starting fluid would either). If you have pressure all the way up until the injectors, and theyre simply not pulsing, check your wiring to them. Maybe try resetting the ecu, Ive had that work sometimes too..

[endlessboost]

Make sure you have good ground on the ecu harness to the intake manifold. If the ground isnt good the injectors wont fire. Did you adjust anything timing wise?

[subwayguy4]

I know I have fuel pressure hence I had the pump prime just to make sure there was nothing stuck in the lines and it freely shot into the air and all over the place.......

What I am most curious about though is.....I grabbed another rail/regulator/injectors and had the fuel prime and cranked just to see if they'd shoot out of the injectors, but nothing came out. I even tried taking the regulator out of rail hooking it straight to fuel line and this is where I found the fuel was not getting through...but on both fuel regulators? Should I be trying for a 3rd one? or possibly aftermarket?

fuel passes through the entire system except the fuel pressure regulator, meaning that it went from the fuel pump directly to the regulator and nothing came outta the hole for the fuel rail.....should it be like that? does it need vacuum to open or extreme pressure build up to be opened? I'm not exactly sure, but maybe I just grabbed another crap fpr...?

[greenzenki86]

sounds like a fuel problem, are you buying used fuel rails?