New Owner, Oooold OMC #2

[chiefalen]

Re: New Owner, Oooold OMC #2

Can you run a fan in there and dry it out faster.

 

[Ridemywideglide]

Re: New Owner, Oooold OMC #2

That was my thought.. I've got a few large computer fans that I could run off that battery for 30 years... Hopefully it won't take that long..

The temp should be in the 50's tomorrow so that will help as well.

As for the pump... Haha.. The diaphram was fine.. It was the one way valves in the lower that were ruined. The inards looked like they had been recovered from an ocean salvage.

 

[Ridemywideglide]

Re: New Owner, Oooold OMC #2

Ok,,, I took my hole saw to the floor.. Couple holes under the dash, couple in front of the engine bay. WATER!!!.. About 6 inches deep.. There is a pass-through hole from the under floor space to the engine bay, but it was higher than the water level. Got that all pumped out, left the holes open, hoping the warm weather will help dry it up.

Get to the lake today, after running on muffs for an hour hoping to help collect some of the gunk out of the fuel tank. Runs fine for about 5 minutes, poking around, checking for leaks, slow cruising, etc.. Wide open accross the lake we go, 40mph.. Fast enough for me on water. Then it starts cutting out and acting like it's running out of fuel. We stop, idle it, and it dies, won't restart. Hit the accel pump, no squirty.. Carb is dry. I pull the line off the inlet of the extra inline filter, tons of gunk runs out, and the line makes a vaccum noise, like the tank has no vents. Then we go to restart and the motor is flooded. Full throttle and crank it a few, it takes off. Again, runs great for about 5 minutes. Little poking around and a full throttle run back across the lake (it's a real small lake, I didn't want to have to paddle too far). Same deal. When I pull the inlet line (main line coming from tank) it sucks air like it's equalizing, and then the carb dumps a bunch of fuel. It does this sucking even with the fill cap open. I know it's getting vent with that open. I can blow back through the line no problem (except for the taste).
I've got a carb kit that thought I could go without, but I think I need that now. But what's the deal with inlet side vaccuum?

on edit;

And the tank is up under the bow area.. No way for it to come out without taking the whole top of the boat off..

 

[chiefalen]

Re: New Owner, Oooold OMC #2

there has to be a vent it's clogged

 

[Ridemywideglide]

Re: New Owner, Oooold OMC #2

Yes there's a vent. It does this even with the filler cap open. That creates a 2" vent and I know the pump isn't sucking hard enough to overcome a 2" vent..

What's an easy way to get the crap outta the botom of the tank? Just get some electric fuel pump and a length of large hose and "vaccuum" it out?

 

[chiefalen]

Re: New Owner, Oooold OMC #2

Ok lift the bow up as far as you can remove the fitting that the fuel pump hose goes to.

That is a anti-syphin valve. Blow thru that valvee it stuck up with gunk? Get it clean or get it replaced. The fuel pickup tube it connected to that fitting as well make sure the screen on the bottom is clean.

Stick a hose into the back of the tank connected to a cheap dc electric fuel pump and suck it all out. Then pour a little gas back into the tank and get that out as well.

Make sure the hose to the motor mounted fuel pump is clear to the fuel pump.

Clean the filters in the fuel pump, clean the water separator and the filter in the fitting that enters the carb.

Put it all back together.

Thats is a awful long way to draw gas to the motor how far from the bow tank to the fuel pump????

I read about this problem before here somewhere.

Never saw it in person, but i have read about this problem here.

Most tanks are located about 2-3 feet in the floor from the motor.

You never posted a pick.

 

[Ridemywideglide]

Re: New Owner, Oooold OMC #2

Ok lift the bow up as far as you can remove the fitting that the fuel pump hose goes to.

That is a anti-syphin valve. Blow thru that valvee it stuck up with gunk? Get it clean or get it replaced. The fuel pickup tube it connected to that fitting as well make sure the screen on the bottom is clean.

Stick a hose into the back of the tank connected to a cheap dc electric fuel pump and suck it all out. Then pour a little gas back into the tank and get that out as well.

Make sure the hose to the motor mounted fuel pump is clear to the fuel pump.

Clean the filters in the fuel pump, clean the water separator and the filter in the fitting that enters the carb.

Put it all back together.

Thats is a awful long way to draw gas to the motor how far from the bow tank to the fuel pump????

I read about this problem before here somewhere.

Never saw it in person, but i have read about this problem here.

Most tanks are located about 2-3 feet in the floor from the motor.

You never posted a pick.

The pickup fitting is located right under the bow floor.. It's wierd, I'll take a pic tonight. The whole bow area is built like a pond, suspended about 18inches from the boat deck, with the tank sandwiched in between. There is no way to pull the pickup tube out if it's a solid tube. I'd have to bore a hole through the bow.
All the filters are clear, I keep backflushing the inline addon filter and the gunk gets less and less.
The main line is approx 18-20 feet long from tank to pump. I have thought about using a couple 10g "portable" tanks and locating them on either side of the engine bay if I can't get this tank cleared up. I'd rather have the weight in the front tho if I can keep it.

 

[chiefalen]

Re: New Owner, Oooold OMC #2

Man thats a long freekin way to draw fuel. No way to mount a different tank under the floor nearer the motor?

What do you mean by a inline fuel filter?

A water fuel separator?

Look i would be running this motor on a external tank till i got it running good and leave that tank alone in the bow.

Once you get it sucked clean add one gallon of gas and then block off the hose that runs to it and let the gas swish around in there for a few trips on the water, running on external tanks.

Then suck it dry again.

You know what a pm is im sending you one now.

 

[Ridemywideglide]

Re: New Owner, Oooold OMC #2

Man thats a long freekin way to draw fuel. No way to mount a different tank under the floor nearer the motor?

If I had another tank, I could set it beside the engine. Aside from the 2g plastic can I used to get it running, I'm stuck with the stock setup. Pic will come soon, I ended up off today so I'll grab one.

What do you mean by a inline fuel filter?

A water fuel separator?

No, tho I have that too... I went to wallyworld and picked up an inline fuel filter to place before to water seperator/fuel filter on the engine. I knew there would be gunk and I figured a $5 throw away would be perfect for collecting it..
As it is now, I have this setup... tank-->inline filter-->seperator-->pump-->carb

Look i would be running this motor on a external tank till i got it running good and leave that tank alone in the bow.

Once you get it sucked clean add one gallon of gas and then block off the hose that runs to it and let the gas swish around in there for a few trips on the water, running on external tanks.

Then suck it dry again.

You might have to add a electric fuel pump before the engine mounted fuel pump to help the engine mounted fuel pump pull gas 20 feet.

You can run it with a switch mounted on the dashboard, but you will have to flip it on and off.

And it ain't legal only for priming the engine mounted fuel pump.

You know what a pm is im sending you one now.

It seems to pull fine for several minutes, even ran between idle and 2000rpm in the driveway for over an hour solid without issue.
After the sucking in the line, I was able to blow into it, bubbling in the fuel tank. Then if I lay the line in the bilge, fuel would freely flow out...
I think it's just sucking up some chunk of gunk, blocking off the line.

 

[Ridemywideglide]

Re: New Owner, Oooold OMC #2

Here's some pics..

 

[Ridemywideglide]

Re: New Owner, Oooold OMC #2

Well I grabbed my 1" clearwater pump, stuck it in the tank fill hole, and pumped out 5 gallons of brown, wet, wasted gas....
I then filled the tank about half full with water and repeated the pumping while rocking the boat and plunging the pump line.. You wouldn't believe the crap that was pulled out... Anyway, rinse and repeat, for about 2 hours..
After the pump was looking mostly clear, I refilled the tank about 1/4 full, took the pump to the back and stuffed the tank fuel line into the pump inlet. Figured I'd let the pump pull the remaining water out through the normal fuel route. Well it pumped, about as fast as it could pulling through a 3/8 line.. but it never quit, never sucked dry, and never pulled a vaccuum on the line..
I think a full tank, another inline filter, a couple bottles of heet, and maybe we'll try her again this weekend.

 

[Ridemywideglide]

Re: New Owner, Oooold OMC #2

In talking to some guys about rebuilding my carb, I came accross a deal on an Edelbrock 600cfm marine... Needs rebuilt to, but I keep see guys on here talk about great this carb is. I hit up Edelbrock and see that they only offer a 600, or a 750cfm.. Is the 600 enough for my SBC? And should I get it and swap since mine is coming off anyway?

 

[Ridemywideglide]

Re: New Owner, Oooold OMC #2

I pulled the pickup out today and I think I found my blockage...

I just chopped the screen out, I'll let the 2 inline filters earn their keep. I think this will solve the problem of acceleration starvation. Maybe I'll get some good gunk out of the tank now too. Keeping a couple extra filters will be manditory.