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  Lowrance EP-10 Fuel Flow Sensor Inconsistent

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Author Topic:   Lowrance EP-10 Fuel Flow Sensor Inconsistent
george nagy posted 06-27-2007 10:08 AM ET (US)   Profile for george nagy   Send Email to george nagy  
The second trip out with my new fuel flow sensor and gauge has proven to be a disappointment. The previous readings achieved an average of 3-GPH and during the second trip revealed a problem. The gauge mostly read 0-GPH, then only spiked a few times to 0.45 or there about. Has anyone encountered such a problem?
jimh posted 06-27-2007 11:29 AM ET (US)     Profile for jimh  Send Email to jimh     
Check the connection to the fuel flow sensor. Check the orientation of the sensor. Often it is recommended that the flow of fuel through the sensor be in a vertical direction and from bottom to top.
jimh posted 06-27-2007 05:18 PM ET (US)     Profile for jimh  Send Email to jimh     
http://www.lowrance.com/Manuals/default.asp may have some advice.

There are several levels which could cause a problem:

--physical problem with sensor: fuel arrow wrong direction, sensor defective; debris in fuel blocking flow sensor.

--network problem: EP-10 not communicating to display device; no terminators; network wiring error; EP-10 electronic problem

--physical problem with display: device has failed; device not on network; display has failed.

george nagy posted 06-28-2007 09:08 AM ET (US)     Profile for george nagy  Send Email to george nagy     
The sensor arrow is pointing in the correct direction however it is not completely vertical nor was it when I got the first set of readings. I did do a device check and the guage is finding the sensor. None of the physical settings have changed since the first trip so it must me a malfunction of a sort with the guage or sensor. I will try to flush out the sensor to see if there may be something blocking it.
george nagy posted 06-28-2007 09:08 AM ET (US)     Profile for george nagy  Send Email to george nagy     
test?
jmorgan40 posted 06-28-2007 01:46 PM ET (US)     Profile for jmorgan40  Send Email to jmorgan40     
George,
If that does not work try dropping Lowrance support an email. I have used their online support at least three times and they always reply within 24 hours and are very helpful and detailed. Good Luck and keep us informed. Iam thinking of buying the same setup and would love the feedback.
Joe
davej14 posted 06-28-2007 02:33 PM ET (US)     Profile for davej14  Send Email to davej14     
George,

I have been using the EP10 for over a year and it has functioned flawlessly If it is being recognized on the network and you can view historical data like fuel usage for the season, then it is probably a defective sensor or dirt. My sensor is installed after a fuel-water separator.

Let us know what you determine.

Texel Tom posted 06-29-2007 08:01 AM ET (US)     Profile for Texel Tom  Send Email to Texel Tom     
Before the advice came out about orientation they were experiencing problems with air bubbles geting trapped in the sensor causing random readings. The arrow needs to be vertical (up or down)to avoid this possibility.

I would certainly recommend doing this first.

TT

george nagy posted 07-09-2007 11:50 AM ET (US)     Profile for george nagy  Send Email to george nagy     
I got a few minutes to look at the sensor [problem] again this weekend and was able to return to getting similar readings to the ones my first trial produced. I was studying the location of my water separator to see if I could [move] it lower to allow for a more vertical arrangement for the EP-10 sensor and noticed something unusual: the inlet and outlet hoses on the water separator unit were located in the wrong places. I decided to first rectify this problem before doing any reconfiguring.

After reinstalling the unit with the hoses connected in the correct locations I then installed a new filter. There wasn't any water or debris present when I dumped the old one so I think that I avoided any contamination the engine and sensor unit. I will run this way for a while [until] I work out a few other problems I'm having with the fuel system, such as the primer bulb getting soft, or until the problem resurfaces.

I have not yet gotten use to the settings and functions of the gauge yet nor have I been able to calibrate it. I think I will have to wait until this flow sensing [problem] is put to rest in order to get an accurate tank level reading since it was not measuring the flow for some time.

As an aside I was able to run at over 3,000-RPM for greater than a half hour and the gauge produced a flow reading of around 7 to 8-GPH. The boat had an estimated 1/2-FULL tank and four average size adults and I was running with the bimini up into a slight headwind. Next time maybe I will have new plugs installed to see if there is any difference.

I did notice that when accelerating to and at speeds over 3,000-RPM I'm getting readings peaking at nearly 12-GPH.

jimh posted 07-09-2007 09:29 PM ET (US)     Profile for jimh  Send Email to jimh     
Thanks for the update. Running fuel through the filter backwards might have spoiled some of its filtering action, but I do not see how it could cause the fuel flow transducer to become intermittent.
george nagy posted 07-10-2007 11:51 AM ET (US)     Profile for george nagy  Send Email to george nagy     
I was just thinking about my last trip out with the ep-10 sensor reading again and have another observation. At a fast idle speed of 1200 rpm the guage was rapidly giving me different readings from around 2.0 to nearly 3.0. For example while looking at the guage it was common to see the numbers rapidly changing such as: 2.90-2.06-2.77-2.94-2.23-etc....I'm wondering if this quick variation in usage is normal?
davej14 posted 07-10-2007 12:10 PM ET (US)     Profile for davej14  Send Email to davej14     
George,

This is not normal and I recommend you contact Lowrance customer service. It will not be accurate until you calibrate it based upon actual fuel usage but it should not be erratic.

For the record, I have my EP10 installed in a nearly horizontal position and have had solid performance since day one.

george nagy posted 07-10-2007 04:19 PM ET (US)     Profile for george nagy  Send Email to george nagy     
Davej14,

What is your setup like? What numbers are you getting?

davej14 posted 07-12-2007 12:45 PM ET (US)     Profile for davej14  Send Email to davej14     
George,

Here are a couple pics:

http://www.bobdean.com/images/djpics/EP-10%20Front.jpg
http://www.bobdean.com/images/djpics/EP-10%20Rear.jpg

My readings are very stable at all forward speeds toping out at 6.5 MPG while cruising at around 4000 RPM. I'll have the boat on the water on Saturday and will let you know what I see at idle.

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