I seem to have solved my problem with low fuel pressure. Just for background; first of all, I don't have a FP gauge but I do have the warning light that will light when FP drops below 5psi. Before I had the in-tank conversion done at the dealer I could get the light to flicker at WOT. After the conversion, the light would come on almost steady when I'd accelerate pretty heavy...not even at WOT. With the idea of maybe having to go to a Fass, Airdog, or similar pump, I replaced all the fuel lines from the rail to the IP with 3/8" hose and eliminated all the banjo bolts with high flow fittings. It looks like that's all it needed. I can hold that throttle to the floor pulling a load and never get even a flicker. So some of you that don't really want to plunk down the money for the pump upgrades might try this first. It seems to have solved my problem for about $70. Rock on!

 

Is this a kit? Or did you make it yourself? I'm interested

 

Banjo fittings suck.... Or, actually, they don't suck enough....

 

Used two kits. Vulcan big line kit that goes between the stock filter and the IP and a "Max" big line kit from Glacier Diesel that goes from the metal tube on the frame rail to the inlet of the filter. Since the in-tank conversion, there is a metal block mounted where the stock LP used to be but fuel still had to go through two banjo bolts at that block. This was bypassed completely. The Vulcan kit was around $32. and the Glacier kit was about $35. Installation was easy for both kits and only took about an hour. For that money, I am totally satisfied and probably will not spend the extra money on a pump upgrade.

 

You can drill them out to increase the flow. Increasing the hole size slightly can make a difference in flow rates.

 

Drilling them out helps a bit, but it's only a marginal increase.

I'll cast another vote for upgrading the lines and replacing the banjos with AN fittings.

I did drilled banjos when I put my FP gauge on. I could pull the FP down around 5-7 under heavy acceleration. I replace the lines from the rail with 3/8" line and AN fittings. At this point, with a stock LP in the stock location, I never drop below 10psi.