{"id":1234,"date":"2009-05-29T17:21:35","date_gmt":"2009-05-29T17:21:35","guid":{"rendered":""},"modified":"2017-12-14T22:13:15","modified_gmt":"2017-12-14T22:13:15","slug":"fit-capacitive-fuel-senders","status":"publish","type":"post","link":"http:\/\/jasonbeaver.com\/rv7\/2009\/05\/29\/fit-capacitive-fuel-senders\/","title":{"rendered":"Fit Capacitive Fuel Senders"},"content":{"rendered":"

There are two options for fuel quantity senders. \u00a0The first is to use a float that reads the fuel level with a hollow plastic float on the end of a wire that sits on the top of the fuel in the tank. \u00a0The position is read through a resistive mechanism. \u00a0This is a well-proven design but has a few drawbacks. \u00a0The other option is a capacitive fuel sender. \u00a0This has no moving parts and can measure from the first few ounces in the tank to the last few. \u00a0The only\u00a0disadvantage\u00a0that I’m aware of is that it must be\u00a0re-calibrated\u00a0when you change fuel types. \u00a0Since I don’t plan on doing that much (if ever), this is a non-issue for me.<\/p>\n

The capacitive senders require mounting two electrically isolated plates in the fuel tanks. \u00a0The capacitance between these plates and the tank is measured by a small AC signal. \u00a0The fuel acts as the dielectric and changes the capacitance. \u00a0Once calibrated, this system is easily accurate to a tenth of a gallon.<\/p>\n

The first thing is to cut some plastic tubing to length.<\/p>\n

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\nThese slip over the screws (after putting on a large countersunk washer)…<\/p>\n

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\n…and through a UHMW washer…<\/p>\n

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\n…and three more UHMW washers on the other side. \u00a0As you can see, the screw can’t possibly come in contact with the rib. \u00a0This is what keeps the plates isolated from the tank.<\/p>\n

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\nThe screws thread into nutplates that are mounted to the capacitive plates.<\/p>\n

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\nHere is one of the plates after mounting it to the rib. \u00a0The two outboard plates have to be modified at the bottom to clear the stiffeners.<\/p>\n

<\/a><\/center><\/p>\n","protected":false},"excerpt":{"rendered":"

There are two options for fuel quantity senders. \u00a0The first is to use a float that reads the fuel level with a hollow plastic float on the end of a wire that sits on the top of the fuel in the tank. \u00a0The position is read through a resistive mechanism. \u00a0This is a well-proven design … Read More<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4],"tags":[],"class_list":["post-1234","post","type-post","status-publish","format-standard","hentry","category-wings"],"_links":{"self":[{"href":"http:\/\/jasonbeaver.com\/rv7\/wp-json\/wp\/v2\/posts\/1234","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/jasonbeaver.com\/rv7\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/jasonbeaver.com\/rv7\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/jasonbeaver.com\/rv7\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/jasonbeaver.com\/rv7\/wp-json\/wp\/v2\/comments?post=1234"}],"version-history":[{"count":4,"href":"http:\/\/jasonbeaver.com\/rv7\/wp-json\/wp\/v2\/posts\/1234\/revisions"}],"predecessor-version":[{"id":3977,"href":"http:\/\/jasonbeaver.com\/rv7\/wp-json\/wp\/v2\/posts\/1234\/revisions\/3977"}],"wp:attachment":[{"href":"http:\/\/jasonbeaver.com\/rv7\/wp-json\/wp\/v2\/media?parent=1234"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/jasonbeaver.com\/rv7\/wp-json\/wp\/v2\/categories?post=1234"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/jasonbeaver.com\/rv7\/wp-json\/wp\/v2\/tags?post=1234"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}