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HisDoghouse
10-15-2007, 09:33 AM
A little history about my fuel gauge problems. I bought my boat new (I’m the first owner of a prior model year boat 2004 bought in 2006) from a local Luhrs dealer.

I identified the fuel gauge problem to my dealer during my first year of ownership of the boat. The symptom was that the gauge would indicate fuel from full to about ¾ of a tank, and then would drop off to where it was showing empty. My dealer obtained and installed a new sender in the tank, which worked for a while, and then the gauge went into the mode where it was showing full all the time. My dealer then obtained and gave to me another sender which I installed in the tank myself.

This new sender is showing (what I believe to be) an accurate indication of the tank’s fuel level. Right now, the gauge is reading just under half a tank. My problem is that throughout my offshore trip this past Saturday, as the fuel burned down, there would be periods of time where the gauge would show a reading (not necessarily correct due to bow-up attitude), and would then fluctuate and drop to empty. After a while (sometimes only a few minutes, other times much longer), the gauge would come back to life and indicate a level again.

These problems appear to only show up when the tank is less than ¾ full, and are not consistent. What I mean is that there is nothing that would indicate why it would start to drop off. Prior to the gauge falling to empty, the needle begins to fluctuate, and then it drops to nothing. Any idea what could be causing this problem? Any tips where I can look first?

I have not notified my dealer about this latest issue as it was observed just this past weekend, and I don’t know if it is something that would be covered under warranty. It is (in my opinion) a continuation of a problem that has existed since I bought the boat. I’d like the opinion of Luhrs management on whether this should (or would) be a covered warranty item.

BTW, the boat ran great out and back. No tuna, mahi, or wahoo, but we did get meat in the box deep dropping for black sea bass and blueline tilefish in 50 fathoms. Can’t wait for the water to cool off a bit more up north to drive the tuna our way.

Joe

Rusty
10-15-2007, 10:27 AM
Joe:

I would bet money the problem is caused by some obstruction in the tank. Good luck in finding the item.

I am glad you can at least get out and burn some fuel. We have been stranded here in SW Louisiana over a month with high seas. I would like to just get out and drag a lure, throw a bait, etc. Hell, I do not care right now if the lure has hooks.

Rusty

HisDoghouse
10-15-2007, 12:58 PM
Rusty,

Thanks for the response. But I'm a bit confused. Why would an obstruction in the tank cause the gauge needle to start to ocillate and then drop to indicate an empty tank? And then sit there for a few minutes to many minutes before rising back up and start indicating again. I am confident that it is an electrical issue vice a fuel movement issue.

Sorry to hear about your weather down there. We've had our own high winds for quite a while up here. This trip I took on Saturday had been postponed twice since early September. We've had enough wind, all we need now is RAIN.

If can give me some insight into a starting point to look on the gauge needle fluctuations, I'd appreciate it. I'd also like to hear (private message is fine) from Luhrs on whether this might be covered under warranty.

Joe

T380fisher
10-16-2007, 09:06 AM
HisDogHouse,
Over the years, I have come to ignore my fuel gauge and have relied heavily on my per hour fuel usage and my flowscan. Fuel gauges are notorious for not working correctly on boats (in my opinion). Be it a loose ground, a worn spot in the sender or a little corrosion on the wiring, attitude of the vessel, I never seem to get a great reading from them. The only way it could be an obstruction in the tank is if a baffle has come loose. I think this is less likely and is more a worn spot on the sender causing it to jump around.

HisDoghouse
10-16-2007, 10:13 AM
I will be getting FloScans when they release their NMEA 2000 units AND Raymarine updates their software to work with them. I had FloScan Twinscan units on my Wellcraft with 225HP FICHTs, and they worked great.

The fuel tank sender SHOULDN'T have a worn spot as it's only 3 weeks old. THe first sender was replaced by the dealer, the 2nd sender read full all the time. This is the 3rd sender. I would go with the Centroid sender IF it could be ruled out that this is not a gauge/wiring problem.

I am not as concerned about tank level accuracy, but more that I can see that there is a level (even if it fluctuates when underway). In the over five years I had my last boat, that sender and the gauge never failed. It wasn't terribly accurate, but it worked. That's all I want for this boat - a working gauge.

Joe

T380fisher
10-17-2007, 07:45 AM
HisDogHouse,
Not to sound silly, but have you checked the wiring on the back of the gauge? or maybe even the problem lies in the gauge itself? It does seem a little odd that 3 senders are all doing the same thing. Good Luck.

What power do you have in you boat? and how about a post with some pointers on locating and fishing those tiles. It is something we have just started to play with..no luck yet.

HisDoghouse
10-17-2007, 09:08 AM
My next step will be to look at the backside of the gauge. While it may be related to the wiring at the gauge end, I still can't help but wondering WHY? Because it doesn't start happening until the gauge gets to 3/4. Maybe a problem inside the gauge itself?

For DC power, the boat came with two 8D wet cell batteries. On the AC side I have an 8K Kohler diesel generator and my shore power is a 220V 50 Amp single plug.

I'll put together something on fishing for tiles in a bit and post it to the site.

Joe

Douglas Fairchild
05-08-2008, 08:47 PM
I would check all of the connectors in the wire between the sender and the gauge. As your boat sat for some time before you bought it, it is likely some corrosion infiltrated a connector some where. Any green stuff has to be removed.

Maximillion
05-15-2008, 11:13 AM
Joe,

Did you ever sort out the gauge problem?

HisDoghouse
05-19-2008, 01:12 PM
I wasn't able to resolve the issue with the standard float-type sender. I am right now in the process of testing for a local manufacturer a capacitance-type sender that they are hoping to take to market soon.

This sender is made of two parallel stainless steel rods that are connected to a controller box. The output of the box (which has additional connections for +12v and ground) goes to the gauge input at the dash.

We'll see how this device works out. Here's the URL for the site for the manufacturer of the sender: http://www.tidewatersensors.com. If it is inappropriate to post the URL, I'm presuming that Derek will remove it.

If there's any interest in how the test goes, I'll be happy to provide it here.

Joe

logadmin
05-19-2008, 03:47 PM
I look forward to hearing how this equipment works. I have no issues with the link.

D

CrazyIslandMoFo
05-24-2008, 07:45 AM
My gauges run screwey too,when full,port reads 3/4 and is pinned while starbord reads correctly.As she getts down to 1/2 tanks port starts to read and starbord starts to jump around, near 2/3'rds empty, port seems to read good and starbord drops right off to pinned empty. I have run for 3 hrs w/ starbord pinned on empty, when i filled i still had 30 gal left in the tank???