Fuel regulator and fuel rail question

[Larry]

I am changing over from a stock block to a stage motor (273 motor). I currently have stock lines with Reds Double pumper. Im changing over to a #8 (1/2" inside diameter) feed line and will use the exsisting feed line as the return and will use a Weldon 2025 pump. Question is the fuel regulator and inlet to fuel rail. I have the stock appearing- adjustable type and stock fuel rail. Will I need to change the regulator and modify the fuel rail? I see the inside diameter at the inlet to the regulator is only 3/8" and the inlet into the fuel rail is only 1/4"! Thanks for any input. Larry :fragez:

[turbodave]

I am changing over from a stock block to a stage motor (273 motor). I currently have stock lines with Reds Double pumper. Im changing over to a #8 (1/2" inside diameter) feed line and will use the exsisting feed line as the return and will use a Weldon 2025 pump. Question is the fuel regulator and inlet to fuel rail. I have the stock appearing- adjustable type and stock fuel rail. Will I need to change the regulator and modify the fuel rail? I see the inside diameter at the inlet to the regulator is only 3/8" and the inlet into the fuel rail is only 1/4"! Thanks for any input. Larry :fragez:
Depends entirely on what kind of intake/doghouse/throttlebody setup you're going to be putting on your stage motor. BTW is it a STG II? On Center or off center?

[Bruce]

I am changing over from a stock block to a stage motor (273 motor). I currently have stock lines with Reds Double pumper. Im changing over to a #8 (1/2" inside diameter) feed line and will use the exsisting feed line as the return and will use a Weldon 2025 pump. Question is the fuel regulator and inlet to fuel rail. I have the stock appearing- adjustable type and stock fuel rail. Will I need to change the regulator and modify the fuel rail? I see the inside diameter at the inlet to the regulator is only 3/8" and the inlet into the fuel rail is only 1/4"! Thanks for any input. Larry

Going larger, also means, that you have a large line to change pressure in as the intake vac levels change. So you have to run a humungo pump to be able to do that. And then with the large return line there is less dampening of the rail pressures. So while at a glance things do look slick, they may have there own teething problems, like say the pump overwhelming the regulator at idle.
Might look up some flow charts for line sizes, and pressures to see what you really need, before making too many decisions. The Power Book as well as some of the AN fitting suppliers have some charts to show what you need.
HTH

[Chuck]

Going larger, also means, that you have a large line to change pressure in as the intake vac levels change. So you have to run a humungo pump to be able to do that. And then with the large return line there is less dampening of the rail pressures. So while at a glance things do look slick, they may have there own teething problems, like say the pump overwhelming the regulator at idle.
Might look up some flow charts for line sizes, and pressures to see what you really need, before making too many decisions. The Power Book as well as some of the AN fitting suppliers have some charts to show what you need.
HTH

I think you will find, that unless you run a pump controller on that 2025, that, as Bruce said, you will overrun the regulator.. That's also too much pump to use the stock line for a return.[The 2025 is NOT designed for continous run time, as on a streeter. Thus the controller comment]
This pump requires a -8 return line and a much higher flow capacity regulator.

The pickup and return lines should be as far apart in the tank as is possible... this helps remove heat and entrapped air before the fuel is recycled to the engine.

[Larry]

I think you will find, that unless you run a pump controller on that 2025, that, as Bruce said, you will overrun the regulator.. That's also too much pump to use the stock line for a return.[The 2025 is NOT designed for continous run time, as on a streeter. Thus the controller comment]
This pump requires a -8 return line and a much higher flow capacity regulator.

The pickup and return lines should be as far apart in the tank as is possible... this helps remove heat and entrapped air before the fuel is recycled to the engine.

I have been on the fence about the pump. I still have time to change my order to a 2015- continuous run and a little lower flow capacity. I drive on the street - very little. Maybe- 100 miles a year. Which will mostly at breakin of the motor. I have been told Cal H. runs the 2025 with the stock style regulator and without the controler. He just does not put many street miles on. I will also use my exsisting feed line (larger) as the return line. Would you recommend the 2015? My other thought was The 2025 is only $50. more and would do well if and when I try to go faster. Thanks Larry

[Larry]

I have been on the fence about the pump. I still have time to change my order to a 2015- continuous run and a little lower flow capacity. I drive on the street - very little. Maybe- 100 miles a year. Which will mostly at breakin of the motor. I have been told Cal H. runs the 2025 with the stock style regulator and without the controler. He just does not put many street miles on. I will also use my exsisting feed line (larger) as the return line. Would you recommend the 2015? My other thought was The 2025 is only $50. more and would do well if and when I try to go faster. Thanks Larry

Also- I will be running T/A's motor and Heads- off center

[Louie L]

From my personal experience. A 2015 will run just perfect with a stock regualtor set up. I can regulate mine down to 37 psi base pressure. Tigged on a -10 fitting on the stock feed at the rail, but prior to did some porting to the entry to get it the rail diameter.I use the stock feed to return into the tank.

a 2025 will start to back up with a stock loc regualtor. You will only be able to get in the low 50s as a base press setting.

[Larry]

From my personal experience. A 2015 will run just perfect with a stock regualtor set up. I can regulate mine down to 37 psi base pressure. Tigged on a -10 fitting on the stock feed at the rail, but prior to did some porting to the entry to get it the rail diameter.I use the stock feed to return into the tank.

a 2025 will start to back up with a stock loc regualtor. You will only be able to get in the low 50s as a base press setting.

Thanks much- I will change the order. Larry