Does anyone make a fuel sending unit with a bigger pickup?

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lauras70mach1

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Aug 1, 2004

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minnesota

Oct 6, 2007

#1

• Oct 6, 2007

• #1

title says it all.

 

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chromedog

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Jan 13, 2006

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worlds center for speed

Oct 6, 2007

#2

• Oct 6, 2007

• #2

bigger than what? most aftermarket pickups are 3/8" ...if you need bigger, youre pretty much limited to bigger tubing, and silver solder

 

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bnickel

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Aug 21, 2002

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lubbock, texas

Oct 8, 2007

#3

• Oct 8, 2007

• #3

factory v8 pickups in 69 and 70 for sure were already 3/8". unless you're planning on well over 450hp that's all you'll need.

 

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lauras70mach1

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minnesota

Oct 8, 2007

#4

• Oct 8, 2007

• #4

Mine's original and it's 5/16.

 

CraigMBA

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Mar 24, 2007

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Orange, CA

Oct 8, 2007

#5

• Oct 8, 2007

• #5

I have one in my hot little hands here from Oval Industrires I got from National Parts Depot. It fits a '70 and is 3/8".

 

68GT500KR_Vert

5 Year Member

Aug 21, 2006

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Virginia Beach, VA

Oct 8, 2007

#6

• Oct 8, 2007

• #6

You can insert a fitting into you stock tank (any size you want) and use the current sending unit as a retutn line port.

 

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bnickel

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lubbock, texas

Oct 8, 2007

#7

• Oct 8, 2007

• #7

lauras70mach1 said:

Mine's original and it's 5/16.

Click to expand...

was your car originally a 6 cylinder? if not then someone has either swapped in a 6 cylinder gas tank or sending unit at one time. as i said, the original v8 units were 3/8". i guess it's possible that someone on the assembly line grabbed an incorrect tank or sending unit and installed it, though. regardless it should have originally been a 3/8 sending unit

 

rusty428cj

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Sep 29, 2007

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Port Richey Fl

Oct 8, 2007

#8

• Oct 8, 2007

• #8

I changed mine to 1/2" by using a bulkhead fitting and AN fittings on my race car.

 

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lauras70mach1

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Aug 1, 2004

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minnesota

Oct 8, 2007

#9

• Oct 8, 2007

• #9

rusty428cj said:

I changed mine to 1/2" by using a bulkhead fitting and AN fittings on my race car.

Click to expand...

Got any photos?

 

CraigMBA

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Mar 24, 2007

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Orange, CA

Oct 8, 2007

#10

• Oct 8, 2007

• #10

68GT500KR_Vert said:

You can insert a fitting into you stock tank (any size you want) and use the current sending unit as a retutn line port.

Click to expand...

Bad idea. Your return line should always be the bigger of the two lines. That side isn't under pressure like the supply side and needs the help to evacuate.

 

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bnickel

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lubbock, texas

Oct 9, 2007

#11

• Oct 9, 2007

• #11

CraigMBA said:

Bad idea. Your return line should always be the bigger of the two lines. That side isn't under pressure like the supply side and needs the help to evacuate.

Click to expand...

huh? i've never seen a return line that was larger than the supply line. maybe the same size but never a larger one. the idea is that fuel will be used at a greater rate than it is sent back to the tank, generally.

 

CraigMBA

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Mar 24, 2007

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Orange, CA

Oct 12, 2007

#12

• Oct 12, 2007

• #12

bnickel said:

huh? i've never seen a return line that was larger than the supply line. maybe the same size but never a larger one. the idea is that fuel will be used at a greater rate than it is sent back to the tank, generally.

Click to expand...

It needs to be the same size at a minimum. But bigger is OK. Smaller isn't.

If you have a huge fuel pump to support huge horsepower, you need a huge return line. At full throttle, you use most (all?) the fuel. When you idle it has to go somewhere. Putting it into too small a return line is a problem on a street car. A straight line race car probablly doesn't care one way or another. Likewise, if you're using a stock 55 GPH deal it doesn't matter.

 

CraigMBA

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Mar 24, 2007

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Orange, CA

Oct 12, 2007

#13

• Oct 12, 2007

• #13

Car Craft has an article that says the exact opposite of what I wrote.

I still don't think I'm wrong, but I might be talking about EFI high pressure pumps and not low pressure high volume pumps for carburators.

Anyway, I apologize for spreading bad tech. My bad.

 

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bnickel

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Aug 21, 2002

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lubbock, texas

Oct 13, 2007

#14

• Oct 13, 2007

• #14

maybe huge horsepower EFI but even stock EFI has a smaller return line, in most cases, than the supply line.

 

xoxbxfx

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May 9, 2001

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Southlake, TX

Oct 13, 2007

#15

• Oct 13, 2007

• #15

bnickel said:

factory v8 pickups in 69 and 70 for sure were already 3/8". unless you're planning on well over 450hp that's all you'll need.

Click to expand...

Aeromotive has carb pumps that support 700hp and has 3/8" in and outs