fuel pump wiring help!

19stang67

Founding Member
Jul 29, 2002
90
0
6
Tampa, FL
I am putting in a fuel pump in a 90 5.0. The old pump has a plug, while the new one has two prongs, a skinny one and a fat one. which prong would the black wire go to? The directions do not say which one is + or -.
 
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