tjlaffite said:What year truck are you planing on buying, 12 Valve or 24 Valve the 97- 99 fuel filter canister has test ports on top 2 -7/16" brass plugs with 1/8 NP threads for pre & post filter presures, and the 2000 have a differnt canister and can be checked at the VP44 scharder valve.
TJ