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Discussion Starter #1
hi guys i had a zl 600 and the engin went south so i got a 800 zr efi engin put in it and the wiring to is the fuel pump the same in the two and what shuld the fuel pressure be right now its realy high like 90psi on my fuel gauge sled runs good but when you hit the throttle some times it bogs down and runs on 1 and sounds like its fluding and if you chop the throttle it gets over it tryed anothere 800 ecm same thing but if i put the 600 ecm in it it runs great. any help would be great. Cat happy
 

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should be 42ish on the return side of the rail if its 90 u have a bad regulator and thats the issue your flooding the motor
 

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Discussion Starter #3
thanks i figured it out last night and my 600 has a reg on the raile and 800 do it like a f7 through the fuel pump .so just got a diffrent fuel pump.
 
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