Getting geared up to drop my fuel tank and over size my fuel lines like in the stickie. Great write up. Does anybody know what can be gained by opening up the banjo bolts at the fuel filter and ip? I've been thinking about drilling them down the bore and the holes going in around the head because these areas should be the most major restriction once I have big supply lines.

Thanks all.

 

i drilled mine out, seems like a good idea but i didnt notice a differece, i think a larger fuel line is a good idea for sure.

 

Every little bit helps as they say. There are just too may places for restrictions to flow. I would prefer to eliminate all the banjo bolts and go to AN fittings.

 

I drilled all my 12mm banjos out to 5/16 and the little holes to 11/64. Just be careful when you tighten things back down as taking material off of the bolt will weaken it.

I seriously think the biggest restriction is the stock fuel filter housing on the head. I snagged the one off my 97 motor as it is a far better design, and it's easier to change the filter out of it too. Too bad these new filters are about 5 times the cost! oh well. You win some you lose some.

 

It's better to just replace the banjos with hose and fittings.

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You mean threaded on one end and barbed on the other? Then just hose clamps?

Is the 2nd gen filter housing a direct bolt on?

 

I was going to use sweeping 90* fittings but I found that because of the bend the inside diameter of the fitting was actually quite narrow. That and banjo bolts take up less space. And if you have one banjo bolt, and if it causes a restriction, then it's not going to matter if you have 2 or 3 that are all the same.


And a second gen filter housing is not a straight bolt on. It's really quite easy to adapt to your truck though. you just need to get the right fittings. Also, there are 2 different kinds of filter housings for second gens. I happen to have the later housing as my motor is out of a 97.

 

oh and if I understand correctly, the ID of the inlet of the injector pump is only like 5/16" too anyway so... or something very close to that size.

 

i drilled my banjos and they worked for 400 rwhp but I was thinking about drilling the head to accept a 3/8npt tread and use an adapter from 3/8npt to an an8 fitting for better flow. Right now I have m12 to an8 adapters and They're kinda restrictive. If I got 3/8npt to an8 the flow should be pretty even. But idk how well drilling and tapping the head will go. What do you think?

 

Gizmo, if you're quoting Wannadiesel, in hopes for her to reply, she's been gone from DTR for a long while now. Maybe someone else with that type of input/knowledge will reply, cause I certainly don't know, LOL!

 

I'd be happy getting the return line banjo out of the way of the idle screw.

 

well **** I wish I knew that lol

 

It can be frustrating going through old threads sometimes.