Hey I’m new here I’ve been reading up on the code for 542 witch is saying fuel pump secondary circuit failure but everything I’ve seen is saying it’s regarding the dual tanks one of the tanks having a bad ground but my truck only has the single rear tank can anyone help me with this it’s a 1993 f150 5.0 ? Thanks in advance

 

You could use a 1993 PCED and look at the pinpoint tests for that code 542
Here is a sample
AllData at your public library has these, and you can print them free in most cases

 

do you know where I can find one of these books to buy

 

They are on Ebay but not cheap, usually a hundred bucks or more
I have 4 of them
You could talk me out of that 93 book cheap if you really need it and are willing to read it
PM me
Send me fifty bucks and I'll send it to you
Probably cost half that or more to send it to you