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Author Topic:   Fuel Line

Posts: 92
From: Denton, TX
Registered: Mar 2001

posted 11-19-2002 08:08 PM     Click Here to See the Profile for Lennie_21   Click Here to Email Lennie_21     Edit/Delete Message   Reply w/Quote
When converting from a straight 6 to a 289 do I need to run a larger diameter fuel line from the tank up to the fuel pump in order to accomadate the larger engine and fuel needs?

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V8 Thumper

Posts: 3529
From: Orange, Ca. United States of America
Registered: Dec 2001

posted 11-19-2002 08:36 PM     Click Here to See the Profile for V8 Thumper   Click Here to Email V8 Thumper     Edit/Delete Message   Reply w/Quote
I'm not 100% certain, but I believe that all Mustangs (aside from maybe Shelbys, big blocks and Boss cars) had 5/16" fuel lines regardless of engine displacement... anyone verify this?

1965 GT coupe, 333ci aluminum headed/solid cammed stroker, four speed, 3.70:1 9"

All Blue Oval, no blue bottle

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Posts: 1746
From: Sucat, Paranaque, Philippines
Registered: Jul 99

posted 11-19-2002 09:16 PM     Click Here to See the Profile for Fastback68   Click Here to Email Fastback68     Edit/Delete Message   Reply w/Quote
5/16 was used on most V8's until 1968, then in 1969 came the switch to 3/8. Big blocks in 68 (maybe 67 too?) had 3/8.

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Posts: 2623
From: alvaton,ky,usa Suburb of Bowling Green, M&M #79, MCA #29208
Registered: Jun 99

posted 11-19-2002 11:00 PM     Click Here to See the Profile for kcode   Click Here to Email kcode     Edit/Delete Message   Reply w/Quote
The fuel line is the same size for the sixes and the V-8, but, the routing is different. You know the routing of the six cylinder, the V-8 made a left turn at the base of the firewall to the outside of the framerail. It hugged the frame to right in front of the shock tower, then through a hole in the apron to the inside of the engine compartment right by the V-8 fuel pump. This routing kept it away from the exhaust. The 5/16 line should be sufficient for a stock or slightly modified motor.


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Posts: 877
From: Lafayette, IN, USA
Registered: Jul 2002

posted 11-20-2002 05:31 PM     Click Here to See the Profile for indyphil   Click Here to Email indyphil     Edit/Delete Message   Reply w/Quote
Not sure If mine was modified but my 1968 289V8 C code car came with a 3/8 line that ran along underneath the rocker panel from the tank to the pump. They carried it at NPD and i bought a stainless replacement -fitted like a glove. Seems like before 68 they ran 5/16 lines. 5/16 should be fine flow wise, if you want to route the line like a V8 you may need to drill a hole in the fender apron and buy a grommet from NPD - otherwise easy peasy.

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Posts: 1332
From: Athens,GA
Registered: Jul 2001

posted 11-20-2002 06:10 PM     Click Here to See the Profile for bluestreek   Click Here to Email bluestreek     Edit/Delete Message   Reply w/Quote
The stock 5/16" line was good for 13.50 @ 100 mph all day long on my old 289 using a Carter M6907 mech. pump. To get under 13.50 I had to switch to a 3/8 line.

1966 Mustang Coupe: Custom glass hood and BIG scoop sits atop a 289 stroked to 331 c.i., Steel crank and girdle, 5.4 H-beams, Forged slugs, ported TFS alum. heads, ported Stealth 8020 intake, CompCams Xtreme Solid Roller, Holley 750 HP, long tubes, 4speed, 9" 3.50 posi, BFG Drag radials..

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