Grounding Fuel Tank |
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john b
Grand Poobah Joined: July-06-2011 Location: lake Sweeny Status: Offline Points: 3236 |
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Posted: July-09-2012 at 4:01am |
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Depending on what scale the meter is on, I would say you should be good!
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1970 Mustang "Theseus' paradox"
If everyone else is doing it, you're too late! |
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sam57
Senior Member Joined: December-07-2007 Location: North Canton, O Status: Offline Points: 360 |
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I've been on vacation and finally got around to checking the ohms resistance between fuel tank and engine block. The needle on the meter goes almost all the way to the right side of the dial between 1 and zero. Is this good?
Sam |
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8122pbrainard
Grand Poobah Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41040 |
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How much resistance? Keep in mind per the previous thread and john's mentioning the USCG reg, it needs to be at or under 100 Ohms. |
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sam57
Senior Member Joined: December-07-2007 Location: North Canton, O Status: Offline Points: 360 |
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I ran a wire from under one of the sending unit hold-down screws to the rear of the engine block and now I have resistance when testing with an ohm meter from the tank to the block.
Thanks to all of you, Sam |
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8122pbrainard
Grand Poobah Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41040 |
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Sam,
Get an engine manual. The wiring diagram will be in it. It's really very basic. I have a 4 and 6 Chris manual and it's in it. |
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sam57
Senior Member Joined: December-07-2007 Location: North Canton, O Status: Offline Points: 360 |
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I should probably explain when I bought this boat the gauges were removed and the wires were cut. To make it worse, sometime along the way the boat was changed from 6 volt to 12 and an alternator was used to replaced the generator and a lot of the wiring was replaced and the only color wire used was yellow. It's been a real struggle getting things working. Maybe I should find somebody that knows what they're doing and have the whole boat rewired.
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8122pbrainard
Grand Poobah Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41040 |
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Al, I'm fine with it and actually thought the comment was funny!! It just took me a few to respond since I was out of the plant on an errand. |
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DrCC
Grand Poobah Joined: April-12-2004 Location: at home Status: Offline Points: 2867 |
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Sorry Pete, I really need to stop doing that.
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BuffaloBFN
Grand Poobah Joined: June-24-2007 Location: Gainesville,GA Status: Offline Points: 6094 |
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Got it.
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DrCC
Grand Poobah Joined: April-12-2004 Location: at home Status: Offline Points: 2867 |
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See, Greg. Pete don't even have a hose.
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8122pbrainard
Grand Poobah Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41040 |
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Greg, You may have missed Sam's first post that it concerned his 55 Chris. I don't have a picture of my 54 but the typical set up back then was just the nipple. The nipple goes from the tank through the deck and the fill cap screws directly to it. My 1918 launch tank: |
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DrCC
Grand Poobah Joined: April-12-2004 Location: at home Status: Offline Points: 2867 |
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Sorry Greg, My '66 and '74 does too. But, Sams '55 Chris * Craft don't or shouldn't.
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BuffaloBFN
Grand Poobah Joined: June-24-2007 Location: Gainesville,GA Status: Offline Points: 6094 |
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Interesting...got a pic? My 79 and 88 had a short section of reinforced hose between the tank and filler. |
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8122pbrainard
Grand Poobah Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41040 |
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Do you know how to use an Ohm meter? As John mentions, you need less than 100. If you want to just stick the tank that's fine but on the other hand you say you want to be safe too. Don't let being lazy get in the way of safety. What other USCG standands are you just ignoring? What kind of "restoration" are you doing to the 55? |
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john b
Grand Poobah Joined: July-06-2011 Location: lake Sweeny Status: Offline Points: 3236 |
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Yes, in the case of a metal tank, the screws thread into holes in the tank causing an electrical connection between the screws and the tank. The sending unit gasket goes between the sending unit and the tank. The base of the screw heads should contact the sending unit. If your gauge works the tank should be grounded, providing the components are installed correctly. In the case of a plastic tank the sending unit grounds the fuel tank through the conductivity of the gasoline. If your sending unit is rusty replace it, they are inexpensive.Sticking the tank is a good way to introduce contaminants to your fuel system. If you are unsure about the ground, check it with an ohmmeter.100 ohms is the standard per USCG. |
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1970 Mustang "Theseus' paradox"
If everyone else is doing it, you're too late! |
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sam57
Senior Member Joined: December-07-2007 Location: North Canton, O Status: Offline Points: 360 |
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Many of the Chris Crafts and Centuries of the 40's and 50's didn't have fuel gauges or temperature gauges, it was an option. If it was pumping water the cooling system was working, and you knew you had fuel by sticking the tank. As a matter of fact, a wood fuel stick with notches came with these boats.
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sam57
Senior Member Joined: December-07-2007 Location: North Canton, O Status: Offline Points: 360 |
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The float mechanisim is rusty and I doubt it would work and I never trust them anyway. I would rather just "stick" the tank to check the fuel level. Does not the fact the screws holding the sender to the tank contact the tank make for a good grounding point? Plus, having electricity at the fuel tank just doesn't seem right. As far as I'm concerned, the fuel gauge fills a hole in the dash and looks good, I just want to be safe.
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8122pbrainard
Grand Poobah Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41040 |
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Does your fuel gauge work? The sender needs to be grounded since that's the grounding point of the gauge. |
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DrCC
Grand Poobah Joined: April-12-2004 Location: at home Status: Offline Points: 2867 |
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There shouldn't be any hose associated with the filler neck and cap.
It should have a threaded brass pipe with a lock ring. I'd still ground the tank via wire. No matter, copper line or rubber line. |
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baitkiller
Platinum Member Joined: October-11-2011 Location: SW Florida Status: Offline Points: 1693 |
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NO Rubber gasket and plastic washers under the screw heads in many cases. There is aground buss welded to the tank for a very specific reason. |
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Jesus was a bare-footer.............
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sam57
Senior Member Joined: December-07-2007 Location: North Canton, O Status: Offline Points: 360 |
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Does this all mean I run a wire from one of the screws that attach the fuel sender to the tank and attach the other end to where the negative battery cable attaches to the block and disregard the rubber and plastic?
Sam |
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BuffaloBFN
Grand Poobah Joined: June-24-2007 Location: Gainesville,GA Status: Offline Points: 6094 |
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FWIW-I think Gary was referring to the filler neck and not the fuel filter.
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DrCC
Grand Poobah Joined: April-12-2004 Location: at home Status: Offline Points: 2867 |
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Sam, Why not lose the rubber hose and replumb with double flared soft copper?
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john b
Grand Poobah Joined: July-06-2011 Location: lake Sweeny Status: Offline Points: 3236 |
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And just because you can't clog a subject enough;
183.572 – Grounding (http://www.uscgboating.org/regulations/boatbuilder_s_handbook/fuel_standards_partp.aspx) Each metallic component of the fuel fill system and fuel tank which is in contact with fuel must be statically grounded so that the resistance between the ground and each metallic component of the fuel fill system and fuel tank is less than 100 ohms. Fuel flowing from the dispensing nozzle into a fuel tank is a potential source of a static electric charge which could cause a spark between the dispensing nozzle and metal component of the fuel tank fill system. To prevent such a spark from occurring, metallic components of the fuel tank fill system and metallic fuel tanks must be grounded. Grounding or bonding may be accomplished by connecting the metallic components electrically by running a wire from one component to the next, and so forth to the boat’s ground. Grounding can usually be accomplished by a connection to the common bonding conductor or the engine negative terminal. If the fuel tank deck fill fitting is nonmetallic, and nonconductive hose is used as a fill pipe, there is no need for grounding the fill fitting. Chrome-plated plastic fill fittings are treated the same as metallic fittings. NOTES: 1. If a metal hose attachment fitting is used, it must be grounded. 2. Fill cap retaining chains need not be grounded. I have used the metal wire coiled within the fuel fill hose as the grounding wire for the deck fill. It makes for a neat looking installation. Check it with an Ohm meter to assure it's continuity. |
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1970 Mustang "Theseus' paradox"
If everyone else is doing it, you're too late! |
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john b
Grand Poobah Joined: July-06-2011 Location: lake Sweeny Status: Offline Points: 3236 |
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Yes. |
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1970 Mustang "Theseus' paradox"
If everyone else is doing it, you're too late! |
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Bri892001
Grand Poobah Joined: September-27-2008 Location: Boston MA Status: Offline Points: 4945 |
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Now, does the grounding of the sender, automatically ground the connected tank?
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john b
Grand Poobah Joined: July-06-2011 Location: lake Sweeny Status: Offline Points: 3236 |
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Yes Pete, you are right. The gas tank needs to be grounded. This is done with the ground wire for the sending unit, which is a metallic component. Any fuel tank that is not permanently installed in a boat and grounded (a portable tank) must be removed from the boat and placed on the ground (not the wooden dock) before filling it. It is also a good idea to touch the tank (or car, or whatever you are filling) with your hand while holding the nozzle before inserting it to discharge any static charge. Also, never fill a fuel tank in the bed of a pickup / trailer, or the trunk of a car. They build up a static charge and have four big rubber insulators.
As far as the question about grounding an in-line plastic fuel filter or any other non metallic component, my answer is still no. |
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1970 Mustang "Theseus' paradox"
If everyone else is doing it, you're too late! |
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8122pbrainard
Grand Poobah Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41040 |
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John, I just reviewed this subject on Friday at the OSHA 10 hour class I went to. I asked the question since the other day our fire chief mentioned it during an inspection. The chief saw we had a plastic gas can for our lawn mower and the conversation went to having to sit them on the ground during filling just like you do a metal. At the OSHA class I asked and both the certified instructors confirmed it as well. Although the risk is less with plastic, they will build static charges. |
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john b
Grand Poobah Joined: July-06-2011 Location: lake Sweeny Status: Offline Points: 3236 |
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Only metallic components of the fuel system need to be grounded. Grounding a non-conducive component, such as a plastic fuel filter, serves no purpose.
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1970 Mustang "Theseus' paradox"
If everyone else is doing it, you're too late! |
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sam57
Senior Member Joined: December-07-2007 Location: North Canton, O Status: Offline Points: 360 |
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How would you ground a plastic inline fuel filter when it has rubber fuel line on both ends? Maybe I should replace it with a metal inline filter with a wire soldered to it and run the other end of the wire to the block. I'm baffled by wiring and electricity.
Sam |
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