universal electric fuel pump

[jman_2_5]

Hi i finally brought my boat home today. 74 checkmate with a 150 hp mercury. It has a universal electric fuel pump on. It works good however the nipple that the line hooks on that goes to the motor broke off inside it. It is a Purolator proformance pro #125. I cant find any spec on it. I dont think its a marine one. I dont know if its wired correctly. I read some post on putting electric in place of the mechanical. I know that it doesnt run with the battery hooked up. U have to turn the key on. So is that wired properly? Any info on this would be appreciated. I know nothing about boats. This is my second post. This is the same boat i posted wheather it was worth the 200 bucks or not. Dad says it needs reed vavles. So were can u buy replacement reed vavles. Dads usually right. I plan on doing it myself and i know that u have to tear the motor apart to get to them. Not starting till i get my manual. Thanks in advance for any info!

 

[Silvertip]

Re: universal electric fuel pump

1) How do you know it needs reed valves? Just because your Dad says it does does not mean it does unless some checking has been done to actually prove it does. IF it needs reed valves you head to the local Mercury dealer, or check any of the on-line parts stores. it's called a "Google Search".

2) Wiring an electric fuel pump on a carbureted outboard is more than just having it run when the key is on. The issue is what happens if the engine stalls, the key remains on, a carburetor defect caused the engine to stall??? The pump keeps running, filling the engine with fuel. You hit the key and "kaboom". You fire.

Electric fuel pumps on an outboard MUST have 1) a marine rated pump and 2) a way to shut the pump off if the engine stalls but the key remains on. On a four stroke that can be done with an oil pressure switch. Two strokes don't have oil pressure so you need to install a pressure switch into the tell tale system or some other way of shutting that pump off.

Lastly, there is no reason to put an electric pump on a carbureted two stroke if it had a mechanical pump to start with. You cannot beat their reliability.

 

[jman_2_5]

Re: universal electric fuel pump

well it has a electric pump on it what ever the reason is it has one. It is a 2 stroke motor. I do search things before i post here. Just cause im a newbie or dont know about boats dont mean u have to be an ***. Dont reply next time if u cant do it decently.

 

[jbjennings]

Re: universal electric fuel pump

Don't wear your feelings on your sleeve, guy......
Silvertip's response was just to the point, not meant to offend you. Realize that he spent quite a bit of his time responding to you, for FREE, and gave you correct info as usual. THere's not that many guys here that know mercury motors---I try to keep them happy.:redface:

I will second that the electric fuel pump being a majorly bad idea and would beg you to change it to mechanical. It won't be that expensive and you could call laingsoutboards.com to try to find one used.

If you'll post the model number of your outboard and give a very detailed description of your outboard's symptoms, some of the super knowledgeable outboard mechanics here will be happy to help you get your motor going.
You could try the parts department here at iboats for reeds and other parts, and online parts diagrams for your motor are likely at crowleymarine.com.
Welcome to iboats and good luck with your motor.
JBJ

 

[jman_2_5]

Re: universal electric fuel pump

Well everything u said is true, just took it personal. I do a lot of reseaserch before i post something that way i dont look like a complete idiot. But i am very mechanical just never owned a boat. Did more work on it today but i cant get it to turn over. Its sat for at least 5 or more years. I sprayed a bunch of liquid wrench and wd 40 in the spark plug holes. So hopefully i can break the motor loose tomorrow. The motor serial number is 3504010. All the spark plugs look new, but the 2nd and 5th spark plug was rusty looking on the end. I cant tell u much more till i can get it running. I found a lot of wires that need repair but really need to get the motor turning over first. Thanks and sorry for taking the other guy so serious.

 

[Chinewalker]

Re: universal electric fuel pump

If the motor is stuck I wouldn't bother trying to "break it loose" as that usually results in a grenaded motor. I would tear it down and inspect everything inside. Rusted bearings have a habit of coming apart when you can least afford them to. Better to tear down, inspect & replace now...

 

[jman_2_5]

Re: universal electric fuel pump

Well got that motor broke loose today. Turns real easy. However i fix one thing one thing breaks. lol Thats just how it goes. I know ive worked on enough old vehicles to know. But seriouly thinking about rebuilding that motor. Just so it will last a long time and not tear it up beyond rebuilding later. How much do you think it would cost in parts. I plan on doing all the work that i can myself. i do know the pistons are on this website for a 100 a cylinder. Is there a page on year that list everything you need to do to rebuild one. I know its probably in the manual, but mine hasnt came yet.

 

[Chinewalker]

Re: universal electric fuel pump

I'm not a huge fan of replacing good parts, so I can't say what all you'd need to do a rebuild. Frankly, you won't know until you have it all apart. You may find the crankshaft is crusty, or that some rods are rusted up.

If you find that there's just a bearing seized and nothing else is amiss, you might be able to freshen it up with honing the cylinders and adding some rings and new seals. You'd also need a few gaskets, and carb & fuel pump kits would be recommended, too. Other end of the spectrum you might need the cylinders bored, new oversize pistons & rings, plus what was needed in the "easy" end. New waterpump kit is a good idea, too - for best or worst case...

 

[jman_2_5]

Re: universal electric fuel pump

I figured as much on the waterpump. Was thinking about the carbs even though they look great on one side doenst mean the floats and everything are working properly. Plus there only 10 bucks a kit. I know what i would like to do is tear it down and bore the cylinders out and put oversize piston and new rings in it. And on the other end i want to go boating sooner too. lol Right now im fixing one thing and another is breaking. I cant get the power tilt and trim working now. Pumps pumping but its not moving. I added fluid to it. still nothing. It has a small leak and im sure its just like hydralic lines on a tractor. if theres the smallest leak on them it wont work. so Is that how it is on a boat too? Also found a 85 150 hp mercury was wondering how difficult that would be to swap out from the 74 150hp mercury already on it. Im talking about wiring and things of that nature. Probably wouldnt just plug in and go would it?

 

[Chinewalker]

Re: universal electric fuel pump

Not likely - the '85 is a V6 and uses different clamp bracket bolt pattern, different power trim system, different wiring harness, etc. If you get the '85 with the controls, it's not a huge deal to swap things over. Should take about a weekend - helps if you have an engine hoist or a hefty beam in the garage to winch it up on.

As for the other stuff - I wouldn't worry about power trim system, etc. until you get the motor sorted out.