2001 Mercury 200 EFI run's but Won't Start :0(

Sideblind

Recruit
Joined
May 26, 2007
Messages
1
After many hours of reading, troubleshooting and replacing parts still drawing dead.

Ok here is the history last week started to get my bass boat ready for spring and my our first trip planned to leave in 2 days.
Went to get ready for start-up replaced plugs , changed waterpump , lower-end fluid and change fuel water seperator filter.
Hooked up the muffs and cranked the hose and engine just turns over , no sign of any motor kick over just cranks .
Checked and replaced primer bulb and ajecent fuel lines, checked spark was good.
Also replaced all stock zip tie fuel clamps with real nice fuel line hose clamps to insure no leak was present.
Pulled a few plugs they were dry. Shot some starting fluid in the cyclinders and BAM engine fires up instantly and and idles and runs perfect.Shut it down and it will fire right up and run good also tested and let it run for 25 minutes.Let it sit again for 1/2 hour and won't turn over again same thing can try chokeing it give it throttle no response.
Give it a shot of starting fluid and fires right up again.
Hooked up a remote gas tank with new fuel to test to see if it was a gas issue and same results.Ran Seafoam injector cleaner through the engine and deep creep in throttle body and still same result. Prime bulb is staying hard and can see no leaks.
Opened up VST vapor seporator and checked the float and needle all seem functional and moving.
When I turn the key I can hear the fuel pump run for approx 15 seconds tried to test pump for pressure with a Dial tire pressure gauge and shows no reading, not sure if this is the proper gauge the pump should put out 34-36 lbs .
The engine was properly winterized and the only other thing I changed was the ignition switch because I broke the key off in it .
Replaced it with a aftermarket switch with 7 terminals instead of the stock 6 terminals just transfered wires from old to new the exte termal was marked M there was 2 m's on the replacement and only one on the stock one Could this be the problem?
All other acessories work correctly show just not sure.
Is there some sort of pre primer fuel sending unit or module thats not working ? Just seems real wierd that it will run like it's brand new with a little help from starting fluid and re-start for up to 45 mins after being shut down ,but them after 1-2 hours goes back to the no starting symptom.

Sorry for all the detail it's been quite frustrating and I'm at my witt's end with a trip planned in 2 days and no hope in sight, all service centers booked or closed til after the holiday weekend.

Anyone help
PLEASE

Dean
 

tashasdaddy

Honorary Moderator Emeritus
Joined
Nov 11, 2005
Messages
51,019
Re: 2001 Mercury 200 EFI run's but Won't Start :0(

1st NEVER EVER use starting fluid spray on a 2 cycles engine. put some premixed gas in a spray or squeeze bottle. it appears something is not priming the engine on intial start up. i'm not familar with the EFI's. but there has to be a starting priming system. I think it may be due to the new switch,. copy the link address for this post, and start a new one. titled changed ign. switch now no start. explain the switch situation, then include this link in the new post. you may get a better response. for someone more knowledgeable than me
 

bayfun

Cadet
Joined
Aug 6, 2008
Messages
7
Re: 2001 Mercury 200 EFI run's but Won't Start :0(

Did you have any water problem in gas. Need to drain chamber where gas oil mix occurs. when facing engine from front, there is a silver metal unit on the right. In front of that unit, but built in as part of that unit is a cylinder with a brass drain plug on the bottom. Drain the muck out of that. Be sure to use frsh gasm to pump from a five gallon can through the primer bulb. Now try starting. I bet it works. Did you replace the inboard water filter and water sensor?
 
Top