fuel pressure changes...

Adger Smith · 10-30-2011, 04:12 PM

Quote"changing to other parts might change things but not correct the original problem. and that serves no purpose.
thanks for the suggestions however.
rod in AZ" End Quote
Rod,
What he was trying to tell you was those two areas of that type fuel pump could be a problem. He wasn't trying to just have you throw a parts change at it. You might have just thought you weren't having problems before or you have picked up your program to a point where the fuel delivery "IS" a problem.
1. The screens restrict flow volume and can cause air to get mixed with the fuel. Air plays heck with regulators, Needle/Seats & emulsion tubes in the carb.
2. The pump pressure needs to be higher(with Moroso spring) because when you are leaving the line or pulling a gear change the fuel in the line sees more negative g forces and the pump needs to push harder to get the fuel to flow forward to the regulator. This could be your real problem. You have to think of the fuel in the line going forward from the rear to the front as a solid and understand how G forces apply to it. The pump needs to be putting out at least 14-18 lbs (some will say more) to keep the fuel going forward to the regulator in a real hard running car.
If you suspect the switch or electical is a problem just wire in your digital multi meter to the pump and monitor the voltage to the pump during a run.
Don't be too quick to dismiss the ideas or suggestions of someone with many years of experience.

rod · 10-31-2011, 11:22 PM

lew and adger. i was a bit quick, sorry. i need to change my thinking
rod in AZ

Adger Smith · 11-01-2011, 12:12 AM

It was Dick, too (FED)
Your welcome.
Hope you can pick up your ride a little... :~)

10-30-2011, 04:12 PM	#1
Adger Smith VIP Member Join Date: Dec 2001 Location: Texarkana Ark/TX Posts: 2,446 Likes: 575 Liked 880 Times in 311 Posts	Re: fuel pressure changes... Quote"changing to other parts might change things but not correct the original problem. and that serves no purpose. thanks for the suggestions however. rod in AZ" End Quote Rod, What he was trying to tell you was those two areas of that type fuel pump could be a problem. He wasn't trying to just have you throw a parts change at it. You might have just thought you weren't having problems before or you have picked up your program to a point where the fuel delivery "IS" a problem. 1. The screens restrict flow volume and can cause air to get mixed with the fuel. Air plays heck with regulators, Needle/Seats & emulsion tubes in the carb. 2. The pump pressure needs to be higher(with Moroso spring) because when you are leaving the line or pulling a gear change the fuel in the line sees more negative g forces and the pump needs to push harder to get the fuel to flow forward to the regulator. This could be your real problem. You have to think of the fuel in the line going forward from the rear to the front as a solid and understand how G forces apply to it. The pump needs to be putting out at least 14-18 lbs (some will say more) to keep the fuel going forward to the regulator in a real hard running car. If you suspect the switch or electical is a problem just wire in your digital multi meter to the pump and monitor the voltage to the pump during a run. Don't be too quick to dismiss the ideas or suggestions of someone with many years of experience. __________________ Adger Smith (Former SS) Last edited by Adger Smith; 10-30-2011 at 04:19 PM. Reason: sp

10-31-2011, 11:22 PM	#2
rod Member Join Date: Dec 2009 Location: Kingman, NW AZ. in the middle of the longest stretch of Route 66 Posts: 315 Likes: 0 Liked 20 Times in 15 Posts	Re: fuel pressure changes... lew and adger. i was a bit quick, sorry. i need to change my thinking rod in AZ

11-01-2011, 12:12 AM	#3
Adger Smith VIP Member Join Date: Dec 2001 Location: Texarkana Ark/TX Posts: 2,446 Likes: 575 Liked 880 Times in 311 Posts	Re: fuel pressure changes... It was Dick, too (FED) Your welcome. Hope you can pick up your ride a little... :~) __________________ Adger Smith (Former SS)