200 merc express xri fuel pressure

tubby 2

Recruit
Joined
Jul 25, 2011
Messages
1
motor loses fuel pressure starts at 40 psi bounces off 30 psi and gets all the way down to like 15 psi just put a gauge on it trying to figure it out last resort local shop changed the switchboxes trigger and now they put a new computer on it that was not cheap all over this fuel problem that i figured out in 5 mins with a gauge tried a different pump and regulator seems to be ok any ideas i'm out of money and it runs good for about 3 mins give or take

:confused:
 

Faztbullet

Supreme Mariner
Joined
Mar 2, 2008
Messages
15,616
Re: 200 merc express xri fuel pressure

Retest the regulator as it sounds like its sticking open.
 

CharlieB

Vice Admiral
Joined
Apr 10, 2007
Messages
5,617
Re: 200 merc express xri fuel pressure

Also check fuel supply to be sure you are not running the VST low.

Disconnect the fuel line anywhere after the primary pump, crank the motor and watch the fuel stream, any weakness rebuild the primary pump, clean the pick-up tube and fitting, replace any/all old hose and primer bulb.
 
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