QUIET external low-pressure electric fuel pump?

RobbMc said
One Walbro 255LPH pump in the PowerSurge 500 and two in the PowerSurge 1000.

You said: "It also says if you do not use a regulator with the pump and lower the fuel pressure the flow will be reduced by 50%. 50% of What???"
I'm not sure where you read that but it has nothing to do with the PowerSurge. That refers to the mechanical pumps we make.

When using the PowerSurge, there is no need to change or remove any of the stock fuel system components (fuel tank, fuel lines, fuel pump, fuel filter etc). The PowerSurge is added to your stock fuel system. The PowerSurge requires the use of a return/bypass regulator but the return line only has to run back to the PowerSurge, not all the way back to the fuel tank.

Hope this helps.

I got the info right off your FAQ page on your website. Here it is http://www.robbmcperformance.com/faq.html & in Quotes below>>

So that being said your factory fuel system will need to have a regulator & return line back to the pump or you will loose 50% of flow. So from what I am reading you need the 1100 HP Pump for a 550HP application if you choose not to use a regulator. It would probably be safe to say the same with the 550HP set up. No regulator you should not have more than 275HP.

Q: Should I buy the 550HP pump or the 1100HP pump?

A: If your car is street driven and the engine produces no more than 550 horsepower, the 550HP pump will work fine. If the car is primarily used for racing or if the engine produces more than 550 hp, the 1100HP pump is a better choice. The 1100HP not only produces more volume but the pressure can be adjusted higher so that a regulator can be used. A high pressure pump used with a regulator will provide steadier pressure than a low pressure pump.

Q: What if I buy a 550HP pump and later find that I need a 1100HP pump?

A: Any 550HP pump can be upgraded to 1100HP specifications for $100. Email us at [email protected] for more info.

Q: Do I have to use a pressure regulator with the 1100HP pump?

A: Not necessarily. The output pressure is adjustable and if you reduce the pressure to about 7 psi, a regulator is usually not needed to prevent the carb from flooding. However, reducing the pump output pressure from 14 psi to 7 psi reduces the pump output volume by about 50%. So if the engine produces over about 550 hp, or if the car is used for racing, increasing the pump pressure and using a regulator is highly recommended.

Q: You don't list a pump/starter/sending unit for my car. Can you make one?

A: In many cases, yes, and often for only slightly more money than one of our standard units. Email us at [email protected] with your requirement for more information.

Q: My car has a small factory "vapor return line" that was connected to the factory pump in addition to the inlet and outlet lines. Can I use this line with a RobbMc pump?

A: Yes. To use the vapor return line with a RobbMc pump, order part number 1010 along with the pump.

Note: Part Number 1010 is automatically included with Buick pump Part Number 1002.

Q: The 7 psi produced by the RobbMc pump is too high for my carb. How can I lower the pressure?

A: If your car is equipped with a factory "vapor return line", you can purchase part number 1010 with your pump. This will reduce pump pressure by about 1 psi. If your car is not equipped with a return line (or you need even less pressure), you can add a non-return style pressure regulator between the pump and the carb.