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Author Topic: Fuel Line  (Read 4400 times)

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JimNolan

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Fuel Line
« on: February 26, 2013, 08:27:43 PM »
Guys,
   I've got a question. When Ford equipped a 1963-67 Ford 427 with two four barrel carburetors ( 710 cfm each ) , what size fuel line to the gas tank did they use. Also, has anyone seen a small holding tank (1/2-1 gal) plumbed into the fuel line before the fuel pump. I've read a lot about fuel accumulators to prevent heat soak and maintain fuel pressure but not inline holding tanks. Jim
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ScotiaFE

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Re: Fuel Line
« Reply #1 on: February 26, 2013, 10:52:02 PM »
Pretty sure it was a 3/8" line all the way.
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69Cobra

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Re: Fuel Line
« Reply #2 on: February 27, 2013, 01:05:13 AM »
Yeah I think the factory line was 3/8" also and the factory 2-4 set up with the BK BJ carbs were 600 cfm
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Kris Rachford
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BruceS

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Re: Fuel Line
« Reply #3 on: February 27, 2013, 03:18:37 AM »
Jim,
+3 on the 3/8" line.  When I ordered a new gas tank to pump line for the Fairlane I had the choice of 5/16" which came with the 289 or the 3/8" for the 390. I doubt that Ford used a bigger one from the factory for the 427 cars. 

Bruce
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My427stang

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Re: Fuel Line
« Reply #4 on: February 27, 2013, 06:36:22 AM »
As far as your tank discussion, I haven't seen a second surge tank used on anything but EFI cars.

In that case they run a low pressure pump to feed an accumulator tank, then a high pressure pump to the engine. 

That allows a sump/reservoir later in the system, so that during launch and cornering a pump in the stock tank that comes uncovered doesn't run the engine dry.

I personally would rather sump the tank or add baffles and sink a pump in the tank itself, but some guys don't want to, or cant cut a stock tank.
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JimNolan

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Re: Fuel Line
« Reply #5 on: February 27, 2013, 07:35:27 AM »
Thanks guys,
     I thought 3/8" was as high as they went. I'm debating the need to change my fuel line to 3/8" instead of the 5/16" that I have now. The 5/16" tubing has 25% less gravity flow potential (.45gph)  than a 3/8" fuel line (.6gph) but I have 38% less need (750cfm) than what was adequate for a 427 2X4 barrel (1200cfm) engine. Given the same fuel line length and fuel pump output capacity, it should be OK. Jim
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Barry_R

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Re: Fuel Line
« Reply #6 on: February 27, 2013, 08:32:58 AM »
Fuel demand comes from the engine - not the carbs themselves.  A 500HP engine might not be maxing out a pair of dual quads, but would pull pretty hard on a 750 carb.  And you also need to remember that the tank to pump line is under light vacuum from the pump, while pump to carb is under decent pressure.  Sizing is more critical on tank to pump.
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