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IF it's the fuel filler and your truck fits one of the following descriptions:
'77 F100 (83) w/ Evap emissions exc. Canada
w/midship tank, unleaded fuel
I'd never seen one either untill I looked it up, it's a Ford part.
Here's the illustration from The Ford parts catalog.
Click on the .pdf link to view and scroll to bottom of the page.
IF it's the fuel filler and your truck fits one of the following descriptions:
'77 F100 (83) w/ Evap emissions exc. Canada
w/midship tank, unleaded fuel
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