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  #1 (permalink)  
Old 04-05-2011
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Join Date: Apr 2011
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Default Fuel Management System Sender problem

Hi, Can someone please email the installation instructions or the link if they know where to find it. I have installed the system, however I think the sender may be faulty. It seems to restrict the fuel to the motor after about 5 minutes of running (which is when the internal engine filter bulb runs out of fuel). It is installed after the filter and before the primer bulb, but the primer cannot suck the fuel up to prime the motor with the sender installed. When I take the sender out it works fine.

I was able to blow through the unit, and it looks clean and doesn't seem to have any obstructions. I will try and test it with power on again, but I would think that these things should fail safe and let fuel through in any case. Has anyone experience any fuel restrictions after installing this?

Any suggestions?
My email address is hawins013@bigpond.com

Last edited by hawkinsb; 04-05-2011 at 11:36 PM.
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Old 04-06-2011
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I've never had mine off to check but could the unit be leaking in air and you loose prime? If the unit was restricting flow the prime bulb would go flat from suction.
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Old 04-06-2011
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Yes Tucker, I thought of this also, but there is no air leakage, because the bulb does suck in and not return back into shape when an attempt to reprime is performed. This tells me there is no air leak.

Thanks for your help all the same.
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Old 04-06-2011
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other than a paddle wheel and a screen on the inlet there isnt anything in the sensor.
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Old 04-07-2011
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Rodbolt, yes it does look fairly simple, but I thought perhaps the padle wheel might have a pickup that locked when power was applied which means it is faulty.

Given that there is a fuel flow problem when the unit is installed and there is no problem as soon as you remove it from the line, then what else could it be but faulty.

As I stated in the first post, there is no visible restriction in the screen at either end and the paddle wheel turns freely when you blow or suck the air through. I will run some more tests with power on and post the results but still confused.
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Old 04-07-2011
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like I said, there is a paddle wheel and a coil of wire on a post.
the coil has a 5v reference and as the wheel paddles pass it the pick off wire is a 5V digital square wave.
its a hall effect device.
no parts avalible for it but if the gasket doesnt tear you can remove the 4 screws and inspect it.
only moving part is the paddle wheel.
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Old 04-07-2011
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You can always test for restrictions with a fuel pressure/vacuum gauge by teeing in the gauge at different points in the system to see just exactly where the restriction is, if there is one.
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Old 04-07-2011
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they clog fairly easy,are easily serviced if so, also ohm out your harness
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Old 04-07-2011
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Join Date: Apr 2011
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Thanks for the reply guys. Yes I checked that I am getting a 5v reference at the sensor so I don't think it is electrical, and I know the fuel flow problem is at this point because I don't have a problem when it is removed.

I'm just going to have to get a replacement one i think.

Thanks for all suggestions and at least it doesn't sound like a common problem.
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Old 04-07-2011
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Sorry if I missed this question already answered.
Can you pump the bulb with
the wires unplugged ?
Did you unhook it from the fuel system, plug it in
Turn system on & try to blow thru it ?

Last edited by Michael j; 04-07-2011 at 10:50 PM.
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Old 04-07-2011
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Thanks Michael, I will run some more of these tests tomorrow and see how I go. Good suggestions thanks.
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Old 04-08-2011
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I will try again to explain.
there is NOTHING inside the sender.
a paddle wheel,doesnt even matter if it moves, and a very large mesh screen.
unplugged,plugged in it simply doesnt matter.
your dog aint chasing rabbits.
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Old 04-13-2011
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Location: Anchorage, Alaska
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Maybe it's directional with an anti siphon valve, turn it around and try again.
__________________
2007 22' Hewes Craft Ocean Pro ET HT
115 HP Yamaha
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Old 03-01-2013
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Quote:
Originally Posted by jb123 View Post
they clog fairly easy,are easily serviced if so, also ohm out your harness
How do you test the sender?
Do you connect voltage, or ohm it out?
My unit has not been operational for years (just got the boat) it stays at 0.0, never moves.
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