2008 mercury optimax not firing

sayiaman

Recruit
Joined
Sep 25, 2018
Messages
1
I have a 2008 mercury optimax 150 I had a fuel pump problem ii got two new fuel pumps now the engine is getting gas. cranked it still didn't start i check if I was getting fire so I change the crank sensor still didn't start what next
 

tommarvin

Ensign
Joined
Nov 22, 2015
Messages
999
Welcome, No disrespect,its about to get real, You had a fuel pump problem how did you know you had a fuel pump problem, did you test the low pressure fuel pump by removing the outlet side and cranking the motor over for 15 seconds and watching the gas gush out low pump ok,, did you remove the vapor seperator and clean but more importatnly did you clean the screen in front of the high presurre fuel pump? Yes or no.
Moving on, " you cranked the motor over did not start? you then checked if you were getting fire,i assume you werent getting spark because you bought a crank sensor, I have never heard of anybody buying a crank sensor for no fire i have read alot of posts and studied alot.
You still with me?, Yo this is what you do pal, If The gas is old you need to pump out the old gas , EFI will not run on old gas period,dispose of the gas properly for good karma..
Then you need to add fresh gas premixed with stabil 360 marine with vapor technology
The low presurre fuel pump is new, lets assume it will work without taking the outlet side off and gushing gas.
Then you need to remove the vapor sererator, clean the tank, more importanly clean the screen in front of the high presure fuel, i know you had it replaced but he may not have cleaned th screen check it man.
Remove the fuel injectors, remove the filter on the inlet end, and clean them like all the you tube videos, replace the filter on the inlet end of the fuel injector,.put it back together.
You need to buy a fuel water seperator and install it after the tank before the on motor fuel filter.
Squeeze the fuel primer bulb hard, push the key to choke turn it and start your motor man, go have fun boating,make sure everybody has a life jacket safe boating
 

flyingscott

Fleet Admiral
Joined
Apr 8, 2014
Messages
8,160
Tom that motor is a 2 strk. What testing was done on your motor? Was it scanned? Is the deadman switch off? Was it a fuel pump problem or compressor problem?
 
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