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SB 08-15-2008 06:43 AM

Gofast -
Tell us, in detail about your fuel system.
Pick up line ID
Any anti-siphon valve ?
Fuel line size throughout - all parts
fuel fitting type and size ID
Fuel pump man/part#/type
If you have a regulator the man/part#/type
Water seperator - housing fitting size and where placed, before or after fuel pump.
Any other filter in system ? Where ? What man/part"/type

If you have an electric pump how far below the top of the tank is it ?

So............every little thing that has to do with the fuel.

You seem to definately have a problem with fuel supply and/or carb so let's attack this. If the system is all in check then you can get good avice from Mr Carburetor ie: Rumrunner.

RumRunner 08-15-2008 11:34 AM


Originally Posted by bobl (Post 2653667)
So the frothing was something restricting the volume, yet psi was good? Interesting. I'm still having a hard time with this. If the volume is too low, the needle and seat will stay open because the fuel bowl is not full. Therefore the pressure should drop. What am I missing in this picture? Keep the discussion coming.

The pressure comes from the restriction of the open N&S assemblty, not JUST from the volume. Since either the fuel pump is internally regulated (to control the pressure) or it will have an external regulator it sets the pressure not the volume.

GoFastSonic 08-15-2008 03:15 PM


Originally Posted by SB (Post 2654151)
Gofast -
Tell us, in detail about your fuel system.
Pick up line ID
Any anti-siphon valve ?
Fuel line size throughout - all parts
fuel fitting type and size ID
Fuel pump man/part#/type
If you have a regulator the man/part#/type
Water seperator - housing fitting size and where placed, before or after fuel pump.
Any other filter in system ? Where ? What man/part"/type

If you have an electric pump how far below the top of the tank is it ?

So............every little thing that has to do with the fuel.

You seem to definately have a problem with fuel supply and/or carb so let's attack this. If the system is all in check then you can get good avice from Mr Carburetor ie: Rumrunner.

I am on the road in Canada right now and will not be home untill the next race next week in Patchoug bu there is what I can remember about the fuel system.

Pick up line ID
Any anti-siphon valve ?
Fuel line size throughout - all parts
fuel fitting type and size ID
Fuel pump man/part#/type
If you have a regulator the man/part#/type
Water seperator - housing fitting size and where placed, before or after fuel pump.
Any other filter in system ? Where ? What man/part"/type

If you have an electric pump how far below the top of the tank is it ?
Fuel line all new 1/2 i think it is the big stuff from west marine, No anti-siphon valves,All line the same including holley daul feed lines stainless to carbs,Pumps are holley middle of the road price not the cheep ones LOL regulator are ne from holley along with psi gauges Water seperators are spin on style before the pump and regultor about 1 foot from the pickup tube. no other filters. no electric pumps either

Kidnova 08-20-2008 01:44 PM

Rum -

6 psi from a 1/2 inch line will produce more volume, than 6 psi from a smaller line, such as 3/8 inch line. Or, the larger fuel line will pizz out a greater volume of fuel than the smaller line, if the psi is the same at both lines.

That what you're saying, Rum ?

RumRunner 08-20-2008 01:49 PM


Originally Posted by Kidnova (Post 2658576)
Rum -

6 psi from a 1/2 inch line will produce more volume, than 6 psi from a smaller line, such as 3/8 inch line. Or, the larger fuel line will pizz out a greater volume of fuel than the smaller line, if the psi is the same at both lines.

That what you're saying, Rum ?

Yup.


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