Holley carb problems

IH8DSM · 08-15-2010, 11:58 AM

It's at 4 1/2 -5 lbs and a 12a is never the answer

fire85gslse · 08-15-2010, 12:09 PM

Quote:

Originally Posted by IH8DSM

It's at 4 1/2 -5 lbs and a 12a is never the answer

wow, lower that down to 3 - 3.5 and start there. Drive it easy to see if the starting issues go away. If you find out then you dont have enough volume then you can go up slowly but might have to look at the fuel pump.

Pressure is one thing but high volume at a lower pressure might be the FP you need. The stock SE one might not be cutting the volume once knocked down to carb pressure. Did you swap that out yet or running a different one?

Cant believe what RB says here:
Fuel Pump - You will need to purchase and install a fuel pump that provides a 6 PSI delivery with a minimum 20 GPH rating - selection will depend largely on installation location. The stock fuel pump unit is designed to provide high pressure (40+ PSI) for a fuel injected intake and is not compatible with this carburetor application. It is NOT recommended that a fuel regulator be used to reduce the stock fuel pump pressure to 6 PSI- the stock pump will fail.

6 psi seems way too high! Are you still running the return? If so then maybe the 6psi is fine. On all the carbs I have used with out the return it seems like 3.5 was the max.

fire85gslse · 08-15-2010, 12:43 PM

ok reading the rb site a bit more. Their recommended FP is internally bypassed at 6psi and allows you to set you regulator at your setting.

looking at holley's site:

Fuel Pressure Regulators – Carbureted
Two Port 1-4 PSI, Chrome
PART #: 12-804
Fuel pressure Regulators are used to adjust for fuel pressure requirements of various carburetors. Too much fuel pressure for a given needle and seat assembly may cause flooding or driveability problems.
3/8" NPT Ports; Allows Adjustment of Fuel Pressure to Compensate For High Flow Fuel Pumps

Features
* 3/8" NPT ports
* .220" (7/32") restriction
* Low Pressure (1-4 PSI)

Again I would drop down to 3psi and try a few days at that to see if the starting issue goes away.
Seems you might be flooding it with too much pressure. It might be blowing past the needle and seat but not real sure on holley's

08-15-2010, 11:58 AM	#1
IH8DSM RCC Contributor Join Date: Mar 2008 Posts: 610 Rep Power: 18	It's at 4 1/2 -5 lbs and a 12a is never the answer __________________ 85 rx7 gsl-se - AA tags/ never ending project will never run

08-15-2010, 12:43 PM	#3
fire85gslse RCC Addict Join Date: Feb 2008 Location: Middle TN Posts: 1,029 Rep Power: 19	ok reading the rb site a bit more. Their recommended FP is internally bypassed at 6psi and allows you to set you regulator at your setting. looking at holley's site: Fuel Pressure Regulators – Carbureted Two Port 1-4 PSI, Chrome PART #: 12-804 Fuel pressure Regulators are used to adjust for fuel pressure requirements of various carburetors. Too much fuel pressure for a given needle and seat assembly may cause flooding or driveability problems. 3/8" NPT Ports; Allows Adjustment of Fuel Pressure to Compensate For High Flow Fuel Pumps Features * 3/8" NPT ports * .220" (7/32") restriction * Low Pressure (1-4 PSI) Again I would drop down to 3psi and try a few days at that to see if the starting issue goes away. Seems you might be flooding it with too much pressure. It might be blowing past the needle and seat but not real sure on holley's __________________ I own A few Rotaries and Yes, I have a rotary problem. (SELLING OFF All my parts) 79SA(Respeed Car),93 FD (tweakit) Last edited by fire85gslse; 08-15-2010 at 12:55 PM.