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Author Topic:   Running out of fuel? Suggestions?
tomslo
Gearhead

Posts: 319
From: Jefferson City, MO
Registered: Aug 2000

posted 06-25-2002 10:46 AM     Click Here to See the Profile for tomslo   Click Here to Email tomslo     Edit/Delete Message   Reply w/Quote
I took my Cougar to the strip this past Saturday for a litle test and tune. It was a disappointing day as I couldn't get a full run in due to the car breaking up in third gear everytime. I think I have the problem tracked down to not getting enough fuel. So, I need to do something about this. I currently am running an unknown mechanical fuel pump and stock lines. Should I put in a bigger mech pump, or go electric? Do I need new lines if I go electric? I was looking at either a Holley Blue pump or going with one of Summit's complete kits.

Thanks in advance for your help. Getting this car running right is frustrating.

Tom

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2002 F350 4x4, True Blue, v10 Auto, 4.30LS, 35" BFG's
1991 Mustang LX 5.0L, AOD *need to sell*
1970 Cougar, 351C-4v, C6

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capri man
Gearhead

Posts: 7611
From: doerun, ga.
Registered: Nov 2000

posted 06-25-2002 11:00 AM     Click Here to See the Profile for capri man   Click Here to Email capri man     Edit/Delete Message   Reply w/Quote
tom, before i went to all that trouble, i would try jetting the carb up a couple of numbers. if i get mine to lean it will pop and sputter in high gear. just a thought.
good luck

------------------
mike r
racing is real
everything else is just a game.
81 capri-7.56 @88mph 1/8
1.56 60 ft.
http://prestage.com/site/site_display.asp?SiteID=141

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Rory McNeil
Gearhead

Posts: 1687
From: Surrey, B.C. Canada
Registered: Nov 2000

posted 06-25-2002 11:40 AM     Click Here to See the Profile for Rory McNeil   Click Here to Email Rory McNeil     Edit/Delete Message   Reply w/Quote
How much gas did you have in the tank, assuming it has a stock tank? Years ago, on my 12 second 66 Fairlane 390 GTA, if I let the tank get much below 1/2 tank, it would lay down at the top of 2nd gear, & into 3rd.After trying all kinds of things, I added a few gallons of gas, & everything was fine. Most older Fords have the pickup tube at the front of the tank, so under hard acceleration, the gas sloshes to the rear, away from the pickup.

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78 Fairmont 428 4 speed [email protected]
80 Fairmont 302 5 speed [email protected]
85 Mustang NHRA Stocker under construction, 302 5 speed

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Moneymaker
Administrator

Posts: 27499
From: Lyons, IL, USA
Registered: May 99

posted 06-25-2002 11:50 AM     Click Here to See the Profile for Moneymaker   Click Here to Email Moneymaker     Edit/Delete Message   Reply w/Quote
Remember that "STOCK" Boss 302. 289 Hipo's, 427's 428 CJ's etc. all ran up to 6000 RPM all day long with stock OEM Carter fuel pumps.
Mike and Rory have you on the right track. Don't condemn the fuel pump just yet.

------------------
Alex Denysenko
Co-Administrator and Moderator/ non 65-66 Mustang owner sensitivity co-ordinator

NHRA/IHRA/SRA member
NHRA and IHRA SS/LA National Record Holder '00, '01, & '02
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28
Part time secret agent license #0089
Professional Manwhore
The Barry of BarrysGrrl

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Mike_R
Gearhead

Posts: 178
From: Indianapolis, IN 46237
Registered: Feb 2001

posted 06-25-2002 12:33 PM     Click Here to See the Profile for Mike_R   Click Here to Email Mike_R     Edit/Delete Message   Reply w/Quote
You're not running an Edlebrock (carter) style carburator are you? They have tiny fuel bowls and are notorious for vapor locking or running out of fuel in the middle of a run. Same with quadrajet carbs. Holleys have alot more fuel capacity and are much more forgiving as far as the fuel supply is concerned.

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jkilroy
Gearhead

Posts: 1808
From: Vicksburg, MS
Registered: Dec 99

posted 06-25-2002 12:36 PM     Click Here to See the Profile for jkilroy   Click Here to Email jkilroy     Edit/Delete Message   Reply w/Quote
God knows I don't like the way they look, but having a mechanical fuel pressure gauge mounted on the cowl sure helps in times like these. I guess they do look a little retro. I have one I can take on and off without having to put holes in the car, for checking stuff just like this.

------------------
Jay Kilroy
68' Fastback GT 390
"No such thing as a cam thats too big"

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bluestreek
Gearhead

Posts: 1724
From: Athens,GA
Registered: Jul 2001

posted 06-25-2002 12:53 PM     Click Here to See the Profile for bluestreek   Click Here to Email bluestreek     Edit/Delete Message   Reply w/Quote
For reference, what were your 60 ft and 1/8 mi. times?

Fuel tank pick-up screens can get clogged with rust and grime. An easy check can be done by pulling the fuel line off at the tank and make sure that there is a full, non restricted stream of gas coming from the tank. Running a clear filter for a while will also let you know how clean your tank is.


Don't rule out ignition either. Weak plug wires, coil breakdown, points floating or gapped too wide(if still used), and too much spark advance, can cause misfires under a long hard pull.

Dan

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Hemikiller
Gearhead

Posts: 667
From: Killingworth, CT
Registered: Feb 2002

posted 06-25-2002 12:53 PM     Click Here to See the Profile for Hemikiller   Click Here to Email Hemikiller     Edit/Delete Message   Reply w/Quote
I had a similar problem on my Cleveland. Would not rev past 5800 in 3rd. Didn't float valves, just laid over. I changed pump to mechanical Holley hi-flo, new valve springs, new timing chain, re-gasketed intake, and a hundred other things. I finally gave up, and drove it that way. Now that I think about it, I always kept it light on fuel, about 1/2 tank or less. This time around, the tank is getting a rear sump, -8 or -10 lines, and a fuel pressure gauge on the cowl.

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tomslo
Gearhead

Posts: 319
From: Jefferson City, MO
Registered: Aug 2000

posted 06-25-2002 02:45 PM     Click Here to See the Profile for tomslo   Click Here to Email tomslo     Edit/Delete Message   Reply w/Quote
Thanks for the replies guys. The car did have less gas in it than usual, only about 1/4 tank. I guess first thing to try is to put more gas in it. Maybe jets will help too. BTW, the carb is a Holley 750HP.

Thanks

Tom

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DidgeyTrucker
Gearhead

Posts: 1631
From: Greenbrier, TN USA
Registered: Oct 99

posted 06-25-2002 03:18 PM     Click Here to See the Profile for DidgeyTrucker   Click Here to Email DidgeyTrucker     Edit/Delete Message   Reply w/Quote
I drag raced all summer one year in my '69 Cyclone 428CJ. One HOT day I ran out of fuel at the top of each gear. I went home and rigged up a cool can. Problem solved. At the end of each run the ice turned into warm water!

Tracy

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