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Old 10-31-2010, 05:34 PM
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Default Starving for fuel at high rpm's, primer ball collapse

I launched my summer project yesterday its a 22' inboard marada deck boat i converted into a duck hunting boat. I removed the inboard and purchased a rebuilt 2005 150hp Johnson Ocean pro, all fuel lines,fuel fill and vent hoses are new, primer ball and Racor filter are also new, all fittings and hoses are 3/8 ID. I pumped out all the old fuel from the 45 gallon plastic tank and filled it with new gas. She runs great at high rpm's for a short time (see video clip http://www.youtube.com/watch?v=pxR50gceh48 ) then you have to pump the primer ball to keep it going and then the ball sucks down flat! I bypassed the Racor = no change i checked the fuel vent hose and there was gas in a low spot so i rerouted the vent line so there are no low spots to trap fuel = no change, im baffled any ideas???
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Old 10-31-2010, 05:40 PM
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Your pickup is probably fouled inside the tank.
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Old 10-31-2010, 05:48 PM
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The inboard tank has a anti-siphon valve where your gas line hooks on. Take it off and clean it out.
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Old 10-31-2010, 05:49 PM
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The only thing I can think if is a kink or a clog before the racor. I would try diconnecting the fuel line before the racor and using some pressureized air to back blow the fuel line and see if it clears anything out. Take the fuel cap off first.
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Old 10-31-2010, 07:07 PM
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1) Can you blow through your vent tube? If not, it's clogged.

2) If your pick up tube has a screen, it's fouled or getting clogged by something in the tank.

3) Anti-siphon valve is clogged. Replace or remove it.

4) You've got crap in your tank.

#'s 1 & 3 are cheap and easy fixes. (Unless you're vent tube id buried in flotation foam)

#'s 2 & 4 will require either simply cleaning the pick up screen, or draining and cleaning the tank.

I've got crap in my tank, and getting the tank cleaned in the morning. Fun....
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Old 10-31-2010, 07:42 PM
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Checked out your video... Cool boat!
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Old 10-31-2010, 07:43 PM
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Quote:
Originally Posted by Beefer View Post
1) Can you blow through your vent tube? If not, it's clogged.

2) If your pick up tube has a screen, it's fouled or getting clogged by something in the tank.

3) Anti-siphon valve is clogged. Replace or remove it.

4) You've got crap in your tank.

#'s 1 & 3 are cheap and easy fixes. (Unless you're vent tube id buried in flotation foam)

#'s 2 & 4 will require either simply cleaning the pick up screen, or draining and cleaning the tank.

I've got crap in my tank, and getting the tank cleaned in the morning. Fun....
I dont think there is crap in the tank, i checked the old stuff when in pumped it out also wouldn't i see stuff in the clear racor bowl......thanks i check out all
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Old 11-01-2010, 04:10 AM
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Default something make a nest on your vent???..

could be salt water build up on the vent screen..
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Old 11-01-2010, 04:35 AM
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had a similar problem and it turned out to be a broken spring in the anti-siphon valve and that $25 part ruined a boating vacation. and, your wise to not exclude checking the fuel system from vent-fill to filter for chinks, hose trimmings or restrictions. i still had my shop run simple vacuum check to see if it was within specs.
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Old 11-01-2010, 03:31 PM
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Well just got out of the boat pulled the new vent hose off and blew it out anyway, it was clear. I then pulled off the barb at the tank, no anti siphon valve (clear 3/8 barb). i then had to cut a hole in the deck to remove the pick up tube and it was very clean and clear...now im officially stumped!
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Old 11-01-2010, 03:42 PM
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I have to take your word for it but there is almost always an anti-siphon valve. It often looks just like a plain angle fitting so chech that you can pass a piece of wire through it.
That said, run the boat with the fill cap off and see if the problem happens. If it doesn't, you have a venting issue.
If it does, you could still have a blocked pickup. Only buy using a portable fule tank will you be able to isolate the blockage.
Mkae sure your filter is piped in the correct direction.
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Old 11-01-2010, 03:53 PM
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not to doubt your capability, pick-up tube clear? is it per chance aluminum solid pipe or plastic somewhat flexible? if its aluminum all the way, do not be fooled ,as there is a cone mesh filter all the way up inside ( 90%), so you have to unscrew it at the knuckle. if you find this screen or any screen,REMOVE it completely! most screens i have seen does not meet the MIN. requirements by OMC in their SERVICE manual.By the way , the fuel tube is not something you want to service out in the high seas, so a good spin-on is easier to service and will trap most debris before reaching the motor. Does this help you any? hope so.
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Old 11-01-2010, 04:41 PM
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I have to take your word for it but there is almost always an anti-siphon valve. It often looks just like a plain angle fitting so chech that you can pass a piece of wire through it.
That said, run the boat with the fill cap off and see if the problem happens. If it doesn't, you have a venting issue.
If it does, you could still have a blocked pickup. Only buy using a portable fule tank will you be able to isolate the blockage.
Mkae sure your filter is piped in the correct direction.
Some one had that barb off before because there was ATV silicone on it (non- OEM) I removed the barb, the elbow and the pick up tube in 3 separate pieces and can see thru them all 3/8 diameter all the way! i might have to get a portable tank and try it, thank you
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Old 11-01-2010, 04:48 PM
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not to doubt your capability, pick-up tube clear? is it per chance aluminum solid pipe or plastic somewhat flexible? if its aluminum all the way, do not be fooled ,as there is a cone mesh filter all the way up inside ( 90%), so you have to unscrew it at the knuckle. if you find this screen or any screen,REMOVE it completely! most screens i have seen does not meet the MIN. requirements by OMC in their SERVICE manual.By the way , the fuel tube is not something you want to service out in the high seas, so a good spin-on is easier to service and will trap most debris before reaching the motor. Does this help you any? hope so.
Dave,I removed the barb, the elbow and the PLASTIC pick up tube in 3 separate pieces and can see thru them 3/8 diameter all the way. Now it does have a screen on the end (about 1"long) i checked it,it was clean. I also blew it out, do you think that would be a restriction? I have a in line Racor (10 micron) is that ok? I by-passed during the test ride think it was the problem and it didnt make a difference
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Old 11-01-2010, 05:44 PM
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Inside of the fuel line is collapsing.
If its grey fuel line, its almost certain. If its black fue line, its likely.
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Old 11-02-2010, 05:18 AM
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Inside of the fuel line is collapsing.
If its grey fuel line, its almost certain. If its black fue line, its likely.
I thought of that but he said he replaced all fuel lines with new . I assume he used A1 marine variety.
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Old 11-02-2010, 05:44 AM
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I thought of that but he said he replaced all fuel lines with new . I assume he used A1 marine variety.
A1??? maybe thats the problem, I used my automotive vendor for 3/8 fuel line
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Old 11-02-2010, 06:17 AM
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Just so long as it was enthanol rated and not the grey stuff.
If you primer ball is collapsing, you DO have a restriction between the ball and tank and that could include the ball itself.

You didnt by chance put the ball in backwards when you replaced the lines????
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Old 11-02-2010, 06:28 AM
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Dave,I removed the barb, the elbow and the PLASTIC pick up tube in 3 separate pieces and can see thru them 3/8 diameter all the way. Now it does have a screen on the end (about 1"long) i checked it,it was clean. I also blew it out, do you think that would be a restriction? I have a in line Racor (10 micron) is that ok? I by-passed during the test ride think it was the problem and it didnt make a difference
Remove that screen, that's first and foremost.

Is your Racor getting little tiny orange-brown sand-like particles in it? If so, your tank probably has a ton of them (the little particles) which is (I believe) the shellac-like coating on the inside of your tank breaking down.

You probably have more filters than just the Racor. How old are they? Have you checked all the filters?

I had a very similar problem, no primer ball, though, but a vacuum was developing in my Fuel/water separator. I had the fuel tank cleaned (thanks Absolute), and there was quite a bit of little sand-like/coffee grinds in the tank clogging my Racor. I would have to release the vacuum to be able to run again. Tooks 3.5 months to figure this out.
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Old 11-02-2010, 06:32 AM
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A portable tank will help isolate the problem..........
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