69 merc fuel problem

[jason621973]

should you be able to flood the motor by squezing the primer bulb . with the motor not running if you pump the bulb it doesnt get as hard as im told it should and you can see fuel dripping out the carbs the motor is an 69 model 800 80 hp

 

[Laddies]

Re: 69 merc fuel problem

no your inlet needles are dirty or floats are set to high

 

[jason621973]

Re: 69 merc fuel problem

would this cause the motor to start and run but die out unless you pump the bulb while its running

 

[JasonJ]

Re: 69 merc fuel problem

If it only runs while pumping the bulb the fuel pumps may be shot. On my 69, all my float needles work, but if I really squeeze that bulb with force, I can still get some fuel past the needles. I have found that this actually helps get the motor started. There is no seepage /flooding while running though, which is all I care about.

 

[jason621973]

Re: 69 merc fuel problem

i just rebuilt the pumps today for the dying problem thats when i saw the flooding

 

[Clams Canino]

Re: 69 merc fuel problem

Then you need to visit the carbs - assuming the pumps were done right. NOTE rebuilding the pumps does not change the carbs. therefore - problem in carbs may be pre-existant.<br /><br />-W

 

[jason621973]

Re: 69 merc fuel problem

got motor running by switching two fuel lines on the motor that where backwards next ?is what should compresion be? also what is the best way to adjust carbs

 

[JasonJ]

Re: 69 merc fuel problem

I have about 120 on all cylinders of my 69. You may see as little as 90, but the more important aspect is the balance. All the cylinders should be within 5 lbs or so on compression. A dead or low cylinder makes the rest work harder, which wears the engine faster. You may also find that the initial readings are low but a good decarb can bring the numbers up significantly. Clams is the carb adjustment god, he can steer you good in that route. Good luck...

 

[jason621973]

Re: 69 merc fuel problem

jasonj thanks im within 15 on them i have 135 on 2 and 120 on 2 acording to a "shop" useing the term loosly by the way where did you go to get info on how to do the fiberglass work on skanky the finished boat looks verry nice

 

[JasonJ]

Re: 69 merc fuel problem

I used the tried and true "Runabout Renovation" by Jim Anderson and also spent some time talking to a shop that repairs/rebuilds boats. The book is fine and gets you through, but it was very helpful being able to talk to guys and see in person how they were doing the rebuilds on boat structure. Sounds like a decarb will probably bring the cylinders a little closer in compression.