All modern fuel systems place a slight vacuum on the fuel tank to reduce evaporative emission - it is very slight, so a slight leak will throw the DTC - fuel cap, hose connection seal ring, crumbled plastic hoses, etc - that hose could be the problem, but also the fuel cap, which requires replacement every so often because of deteriorated seals - at any rate, repair that hose, then look at the fuel cap if the DTC reoccurs - the LDP is on the front side of the fuel tank, that contraption with all the hoses and a few wires
96 Dodge 3500 CTD, unseemly unstock
If it's a Diesel thing, I do understand....
'05 CRD; INMOTION ST-II; EDGE Trail; Pricol Boost, EGT, Rail Press, Trans Temp; SEGR; Provent; Magnaflow;
2.5" Daystar f, OME r; Al's arms, Moogs; Ranchos; Rubicons, 2.55 Gy's; Suncoast T\C, Transgo
'06 Cummins lift pump module, Fuel Manager\Filter, Filterminder
Four in a row really makes it go