|
Author
|
Topic: carb problem
|
Calcat
Journeyman Posts: 75
From: Los Angeles, CA
Registered: Feb 2002
|
posted 04-11-2002 02:44 AM
   
Put in new fuel pump and did 4v conversion on the 302. After new carb finally caught it would not rev, seemed to have flooded condition. Adjusted float level correctly (600 cfm holley 4160). Tried to restart and fuel literally shoot our of the float vent tube. Swapped carbs with another 600 I knew was good. More fuel shooting out of vent tube big time.
The only thing I can think of is that the fuel pump has excessive pressure and is overcoming the inlet needle. Any other thoughts?
IP: Logged |
Moneymaker
Administrator Posts: 18092
From: Lyons, IL, USA
Registered: May 99
|
posted 04-11-2002 09:51 AM
Mechanical pump?  ------------------
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
US Class Nationals link
IP: Logged |
thedave66
Gearhead Posts: 244
From: mountain home, idaho
Registered: Sep 2001
|
posted 04-11-2002 10:56 AM
if it is the pump maybe get a fuel pressure regulator? That may help
IP: Logged |
Hemikiller
Gearhead Posts: 256
From: Clinton, CT
Registered: Feb 2002
|
posted 04-11-2002 12:31 PM
Give the float bowls a rap with a screwdriver handle, Holley carbs are notorious for stuck needles/floats. You should be able to adjust the float level no matter what the pressure of the pump, as there is minimal force on the needle. Granted, 45 psi may cause you problems. Get a gauge on that line anyway. Considering the moment arm of the float vs needle, I seriously doubt the pump is pushing the needle open. Try screwing the level down more than you have it now, or get one of those carbs rebuilt. "GOOD" is a very relative term with a Holley, the gaskets dry out at an astonishing rate, and a "good" carb that sits on a shelf dry for a week can suddenly be a "junk" carb. All that is needed is probably a freshen up.[This message has been edited by Hemikiller (edited 04-11-2002).]
IP: Logged |
MidLifCrisis
Gearhead Posts: 194
From: USA
Registered: Oct 2001
|
posted 04-11-2002 10:23 PM
I don't want to state the obvious, but is it the correct fuel pump? If it's a pump for a fuel injected car they run approx 100 psi. A carbuerated pump is only like 8-12 psi or there abouts. I have just done the 4-V conversion on my '67 289. I too had the fuel fountain from the breather tube and just needed to adjusts the floats. It is scary to look at, but easily corrected. I wish you luck, Charlie
IP: Logged |
Calcat
Journeyman Posts: 75
From: Los Angeles, CA
Registered: Feb 2002
|
posted 04-12-2002 02:39 AM
I replaced the fuel pump with a stock mechanical. Cranked down the float level until there was just a dribble from the sight plug. I'll try cranking down further. Never had this problem from a Holley before that is why I suspected the fuel pump may have been miscalibrated.
IP: Logged |
bluestreek
Gearhead Posts: 1011
From: Athens,GA
Registered: Jul 2001
|
posted 04-12-2002 12:32 PM
A lot of times when you make any changes in the fuel system you get small debris that can end up in the needle and seat. They can also stick, if they set up awhile. If you dont get it working right just put in a new needle and seat and put a inline filter as close to carb as possible and that should take care of it. Make sure to change the oil after it is running OK. Gas can dillute the oil and cause premature engine wear. BS
IP: Logged |
Mustangsandmore Forums
UBBFriend: Email This Page to Someone! 
