fuel line

David,

That part of the primary fuel system, between the lift pump and secondary fuel filter should be operating at a nominal 20 – 25 psig. However, if the secondary filter becomes restricted or is beginning to plug up thereby increasing resistance to lift pump flow, pressures can become rather high unless the filter has a built-in by pass valve, which some do. I replaced all of my primary fuel lines with 5/16″ fuel hose and regular mini-hose clamps.

I haven't tried that with those particular fittings, but I've done it with many others having crimped sleeves and it works just fine.  I've also made crimp sleeves from steel tubing and crimped them with a modified pair of Vise Grips which also worked fine on stuff with less than 200 psi pressure.  If you're using a reinforced hose it takes surprisingly little clamping pressure t mae them stay on even slightly swelled nipple fitting.

You used hose clamps or new ferrules I hope.