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Were are you located? That would help me get a source close to you.
I am attaching a link to one online.............you should be able to go to a larger local automotive parts house and get one. Give the the year and tell them it is for a GM P-60 chassis. Use the part number for the one online and they can cross reference it. Hope that gets you going. Keep in mind the gas tank needs to be lowered to get this installed. Hope that proves helpful here. Please get back to me if you need more as all follow ups are included in our fee. http://www.autopartswarehouse.com/shop_parts/fuel_sending_unit/chevy/p30.html
Check that.............this has a P-37 chassis.
And here is a source that might be able to rebuild yours............they specialize in these. http://www.tristarrradiator.com/Motorhome%20%20RV%20Page/Motorhome%20%20RV%20Page.html
Check the prices on the links I gave you.............we don't sell parts here. Click on the link and it will take you to their site. Plan on about $130 dollars. Perhaps cheaper to have yours rebuilt.