Just bought a 91’ f250 having fuel issues

[gandalf]

I forgot to mention...When you fill the fuel filter with ATF be sure to pour the ATF into the outer ring of holes rather than the larger center hole. That way the ATF itself will be filtered.

 

[Cainon]

I removed the filter and replaced it filling the new one with seafoam when I bought mine and it had been sitting about a year. Cleaned the idle right up. No issues yet caused by doing this either.