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DNK
10-10-2008, 12:47 PM
I want to make sure I have this right. The line from the tank to the pump is 5/16.
The line from the pump to the carbs is 1/4.

Would it matter in my case. The Carter electric pump is in the spare tire well and it is a long way to the carbs.

RonMacPherson
10-10-2008, 12:55 PM
the larger diameter fuel line, obviously will flow more volume of fuel. So I recommend staying with the larger diameter line/hose as far forward as you can...

DNK
10-10-2008, 12:57 PM
Will it cause to much fuel pressure or amount to the carbs? (SU's)

Brosky
10-10-2008, 01:07 PM
It will be based on the pump's pressure output. If that is OK, you should be fine.

Tinster
10-10-2008, 01:43 PM
Don, I've got 5/16 from tank to pump, out of pump
and into a 1/4" Tee just before the front carb.

My fuel pressure checked out good with either
mechanical or elec pump.

d

DNK
10-10-2008, 03:17 PM
So do you guys think that 5/16 up to the carbs and then Y and then 1/4 should be OK?

Next question. My 5/16 line is pretty fat, .572. It's fuel/emission line rated to 50 psi. Is it possible to get thinner line?

Tinster
10-10-2008, 04:04 PM
Don,

My 5/16" ID hoses are fairly chubby OD also.

But when you live on island with only
a choice of one.............chubby is ok.

Also, I think chubby is a good thing for inside
the engine compartment. More insulation to keep
the fuel cooler going into the carbs.

d

TR6BILL
10-10-2008, 07:57 PM
Don, the stock mechanical fuel pump accepts only 5/16" going in and 1/4" going out. Stick with this.

RonMacPherson
10-11-2008, 02:21 AM
Don, the size of the fuel line is not going to affect the fuel pressure. It is not like the nozzle on a water hose where you can turn it down and see, what seems to be an increase in pressure.

It will have an affect on the VOLUME of fuel transported. Read that the amount of fuel sent from one site to the next.... Pressure is dependent on what's pushing it, gravity, weight on top of the fuel(bladder) pump, etc...

DNK
10-11-2008, 09:45 AM
Bill-So are you saying stick with the stock size or the pump.?

Ron- Understand that, concerned ,will the volume overwhelm the carbs ?

Tinster
10-11-2008, 10:00 AM
Don, the stock mechanical fuel pump accepts only 5/16" going in and 1/4" going out. Stick with this.

<span style="color: #660000">Hi Bill !! Strange?
I have a Brosky rebuilt OEM mechanical pump in
my TR6 and both inflow and outflow are
5/16" pipes going into 5/16" hoses.

d</span>

TR6BILL
10-11-2008, 10:54 AM
Bill-So are you saying stick with the stock size or the pump.?

Ron- Understand that, concerned ,will the volume overwhelm the carbs ?

Both. You only need about 2-3lbs of pressure.

TR6BILL
10-11-2008, 10:55 AM
Don, the stock mechanical fuel pump accepts only 5/16" going in and 1/4" going out. Stick with this.

<span style="color: #660000">Hi Bill !! Strange?
I have a Brosky rebuilt OEM mechanical pump in
my TR6 and both inflow and outflow are
5/16" pipes going into 5/16" hoses.

d</span>

Dale, that is your problem. Brosky rebuilt your pump! Should be as I stated above. Don't question me!!

Tinster
10-11-2008, 11:19 AM
Not to argue with an Expert Bill..........
because I know just about nothing of auto mechanics
but....

I've had 5 or 6 mechanical pumps in my car:

OEM, rebuilt OEM and new manufacture mechanical.

Every single one had the same steel pipe size flowing
in and flowing out. All the pipes slid perfectly into
5/16" fuel line hoses.

But then, my car was so Pedro-ized when I got it
so who knows?

I've got Paul's pump doing a so very fine job with
5/16" necking down into 1/4" at the carbs.

No flooding of my carbs and enought fuel to easily
hold 80 mph.

<span style="color: #006600">EDIT: I've a hard wired electric pump in the engine bay
as emergency backup for when the mechanical fails.
I checked it- 5/16" hoses in and out. Strange.</span>d

Brosky
10-11-2008, 01:53 PM
<div class="ubbcode-block"><div class="ubbcode-header">Quote:] Dale, that is your problem. Brosky rebuilt your pump! Should be as I stated above. Don't question me!![/QUOTE]

Hey, what's up with the questioning of my finely rebuilt fuel pumps. And here's a few pics to prove the inlet &amp; outlet sizes.

Tinster
10-11-2008, 05:04 PM
And here are photos of Paul's pump
installed in my car.

Thanks again, Paul!!

d

https://i134.photobucket.com/albums/q101/TinsterTR6/hosesTotal.jpg

DNK
10-11-2008, 09:05 PM
Dale- The pump probably has 3/8's pipe thread on both sides and you can size it any way you want.

RonMacPherson
10-12-2008, 04:15 PM
Don, the volume will not overwhelm the carburetors. The flow of gas, both volume and pressure is controlled by the needle and seats. All the volume in the world at low pressure is fine. Excess pressure is what overcomes the needle and seat...(or dirt, or foreign matter, jamming the needle open).

DNK
10-12-2008, 07:17 PM
Cool, thanks Ron.
Now, anybody know of skinnier tubing w/o going to metal?

Brosky
10-12-2008, 07:28 PM
<div class="ubbcode-block"><div class="ubbcode-header">Quote:]Now, anybody know of skinnier tubing w/o going to metal?[/QUOTE]

That's resistant to the fuel and additives of today, while going around and over a hot metal block?

DNK
10-12-2008, 11:46 PM
Not going around the block. Going up the passenger frame rail and then up