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Installing an e-fuel regulated return system on my 97 f250. I want to reuse the original 5/16 supply and return metal lines. But I am planning on installing stage 1.5 injectors down the road. Will the stock lines flow enough to maintain pressure?

Also what size are the fuel ports in the heads? I see that the two lines feeding the rear of the heads are pretty small. It’s 1/8 pipe going into the head. I don’t see much point in upping the line size if all the fuel has to pass through these little fittings. seems to defeat the point. If the heads only have 1/8in or 1/4 inch ports why run bigger line?
 

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Pardon my manners. I guess I should start buy saying hello! Just joined the forum But have been haunting it for a while. Great information on here.
 

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Didn't see this before now so if you still want to know, the stock lines flow plenty of fuel for what you want to do. The fittings at the back of the heads are 1/4" and are the return line's. The braided lines at the front are the feed line's
 
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