1/2" Fuel line /Sending unit

[Rocket]

1/2" fuel line /Sending unit worth doing. I don't have a 500+hp engine but would it hurt to go in this direction?

I do have a 440 -6 engine pretty much stock with future plans to do a stroker.

 

[moparchris]

1/2" fuel line /Sending unit worth doing. I don't have a 500+hp engine but would it hurt to go in this direction?

I do have a 440 -6 engine pretty much stock with future plans to do a stroker.

I would say no. 5/16 is good to 500 ish with a pusher style pump (electric) and a 3/8 is good 650 with a good pump as well. I have seen over 1000 hp supported on a 1/2 inch line with no problem.

 

[droptop]

Not sure what you are asking, but if you are replacing them, why not go with the bigger line? :cents:

 

[Rocket]

Not sure what you are asking, but if you are replacing them, why not go with the bigger line? :cents:

Thanks for the responses. I was just wondering if it is possible to have too big a fuel line. If it won't hurt anything 1/2" is the direction I'll go. Thanks again!

 

[moparchris]

Not sure what you are asking, but if you are replacing them, why not go with the bigger line? :cents:

Thanks for the responses. I was just wondering if it is possible to have too big a fuel line. If it won't hurt anything 1/2" is the direction I'll go. Thanks again! :stooges:

It can hurt if the line is too big. For instance, a stock pump will have a hard time moving the column of fuel under acceleration. So if you go with the big line you will need a bigger pump.

 

[mcmopar]

Didn't they use the same pump on the 383 and 440? The 383 used a 3/8" line while the 440 used a 1/2" line. All the parts catalogs I have seen show the same pump for 383 and 440 :huh: . The Hemi used a different pump if I remember correctly.

 

[Rocket]

Dumb question but did the 69 road runner have a return fuel line? I don't have access to the car right now and can't check. Its funny INLINETUBE.COMS beats yearone even with 30% discount.

 

[mcmopar]

Perhaps if the car was slated for California delivery. Their pollution control regulations were far stricter than other states. Of the two I've owned there were no fuel return lines on them - just a single line.

 

[John69RR]

The Hemi cars and 440-6 cars used the vapor line. I thought standard fuel linewas 5/16 and 3/8 on the Hemi.

 

[moparchris]

The Hemi cars and 440-6 cars used the vapor line. I thought standard fuel linewas 5/16 and 3/8 on the Hemi.

Right on!

 

[mcmopar]

The Hemi cars and 440-6 cars used the vapor line. I thought standard fuel linewas 5/16 and 3/8 on the Hemi.

Yup - I don't know where my head was! :loco:

 

[droptop]

The Hemi cars and 440-6 cars used the vapor line.......

440 4 barrel cars had the return line as well. My GTX has the big line with a return. :cents:

 

[Big John]

1/2" will be much harder to bend and work with and there will be no benefits.

Filters, pumps and the carb will have fittings for 5/16 or 3/8" tube and will have openings that size. Unless you buy the race stuff ($$) any size advantage from the tubing is lost in those restrictions anyway.

 

[Rocket]

1/2" will be much harder to bend and work with and there will be no benefits.

Filters, pumps and the carb will have fittings for 5/16 or 3/8" tube and will have openings that size. Unless you buy the race stuff ($$) any size advantage from the tubing is lost in those restrictions anyway.

Thanks guys! With this last statement my mind is made. I will stick with the 3/8" sending unit /fuel line. That said Is there any advantage to the return line? In other words should I do that as well? Sorry to be a pita.