Fuel line size

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blue65coupe

New Member

Aug 14, 2006

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North Carolina

Oct 16, 2006

#1

• Oct 16, 2006

• #1

Just replaced the sending unit and noticed the exit was 3/8". My line is 5/16" and was wondering if anyone ran 3/8" all the way to the carb and if it made any difference. Newly rebuilt 289 with Edelbrock Performer Package (600 cfm carb), with Jegs manual fuel pump (not hp), .040, built heads guessing around 275 hp. Is it worth the hassle to run 3/8"?
Thanks,
Duane

 

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ForceFed70

That's why they call it "dope"

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Dec 6, 1999

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Oct 16, 2006

#2

• Oct 16, 2006

• #2

Not for 275hp.

The way I understand it:

5/16 is good for 350HP, 3/8 is good to 500HP.

 

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blue65coupe

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#3

• Oct 16, 2006

• #3

Thanks Bottlefed70. Makes sense to me...not worth it. I'm safe either way. The guy that helped me with the car is guesstimating 315 hp. I'm saying 275 and we'll see whenever she hits the dyno...after 1000 or so miles.

 

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blue65coupe

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#4

• Oct 16, 2006

• #4

one more question

Any ideas on a slight hesitation when barely applying throttle? Just start to hit the gas and it doesn't want to go. After you get past it she'll scream the rest of the way. This happens when barely applying throttle at 20 mph or 70 mph. Maybe play with the fuel/air ratio?

 

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ForceFed70

That's why they call it "dope"

Founding Member

Dec 6, 1999

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Oct 16, 2006

#5

• Oct 16, 2006

• #5

Difficult to say, but I'd start by playing with the accelerator pump. Maybe a larger pump or a different pump cam.

 

iskwezm

10 Year Member

May 24, 2005

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Rowland Heights,California

Oct 16, 2006

#6

• Oct 16, 2006

• #6

blue65coupe said:

Any ideas on a slight hesitation when barely applying throttle? Just start to hit the gas and it doesn't want to go. After you get past it she'll scream the rest of the way. This happens when barely applying throttle at 20 mph or 70 mph. Maybe play with the fuel/air ratio?

Click to expand...

if its a Edelbrock carb, you can make the hesitation better, but the carbs are known for that. Try adjusting the accelerator pump shot.I traded mine for a Holley years ago.

 

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blue65coupe

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#7

• Oct 16, 2006

• #7

 

fasttback

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Oct 16, 2006

#8

• Oct 16, 2006

• #8

Sounds like my problem. Like the others say - play around with the pump cam and squirter size. Remember it will bog with too much or too little fuel.

 

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blue65coupe

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#9

• Oct 16, 2006

• #9

Thanks guys. I had heard that about Edelbrock. Almost went Weind intake Holley carb but didn't. Oh well. I'll play around this weekend. Thanks again

 

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blue65coupe

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#10

• Oct 16, 2006

• #10

iskwezm, man your sig looks wicked.