Fuel Line Mod

[doddmoore]

In the Manual it states if you are using a "high horsepower fuel injected engine" there are a few tweaks they recommend. These include drilling out the return line, and I assume going with a larger fuel hard line. My questions are several:
1. I'll be running a Fuel Injected 347, is that going to be considered "high horsepower" enough to warrant the change? I will only run this on the street, never the track.
2. If I do drill it out do I need to use a different fuel filter than the one in the kit?
3. Will I also need larger fuel lines?
4. Should I ask Mike Forte about all this since he will be building the engine?

I guess that is it for now. I do have an update since I have FINALLY gotten back to the build. You all know how that goes. As of August 7th I am at the 1 year mark.

[GoDadGo]

Assuming that your pump is in or very near the tank, then no you won't need larger fuel lines to feed your 347.

If you were running a mechanical pump on your engine (Carb) or an electric pump up front then upping the diameter of the feed line might be a good idea.

[phileas_fogg]

My gut tells me GoDadGo is correct, but it's certainly worth talking to Forte about. He knows engines (& these cars) inside, outside, and upside down.


John

[RJD]

You’re running the Holley Sniper EFI right? See page 10 of the Holley Sniper EFI instruction manual - it recommends 3/8” feed and return lines.

[Boydster]

You’re running the Holley Sniper EFI right? See page 10 of the Holley Sniper EFI instruction manual - it recommends 3/8” feed and return lines.

...and if you're doing 3/8 feed and return, this is the best fuel pump holder / pickup in the land... http://www.promracing.com/fuel-supply/individual-fuel-parts/high-flow-fuel-pump-hanger-for-1986-1997-mustangs.html

Anything else is a restriction and, well, less.

[RAMRobAZ]

What horsepower are you buying? Check the EFI manual and you will see the 3/8 is needed.

[Avalanche325]

What horsepower are you buying? Check the EFI manual and you will see the 3/8 is needed.

There you go! There are 300hp 347s and 600hp 347s. The 347 part doesn't determine how much fuel it needs. How many horses you are feeding is the determining factor.