Anyone using a Edelbrock Quiet-Flo 160 gph Electric Fuel Pump

[mnm99]

It's set at 12 PSI. I read it has an adjustment to raise or lower the pressure on it. I need to know how high I can raise the pressure above the stated 12psi.

Thanks

http://www.summitracing.com/parts/edl-1792

[CHANMADD]

Why...?

[BevanWright]

I have one of those, in my case it pumps into a surge tank, and is not under pressure.

I believe if you turn the brass screw it will adjust the pressure, but which way and how much I am not sure. Also make sure you clean out the filter in the bit next to the brass screw as it blocked in mine (with old foam from the race tank which has now been replaced).

[mnm99]

Originally Posted by CHANMADD

Why...?

My car is boosted and need more than 12PSI. Asking how high it will go up to. I don't have a FP gauge yet so I cant check for myself yet.

[Karl Bebout]

mnm99, here's some info, thanks to Steve Zack of Automotive U, if you're using a blow through system: "The first concern for an engine using a blow-through supercharger where the carburetor is under boost pressure is fuel pressure. A special fuel pressure regulator that is boost pressure referenced along with a high pressure/volume fuel pump to keep the fuel pressure correct for this type of supercharger system must be used. The boost referenced pressure regulator senses the boost pressure and then regulates the fuel pressure to keep the fuel pressure at a set amount above the boost pressure. The pressure that we use most is 5 ½ to 6 lbs. over the boost pressure, so when you have 6 lbs. of boost the fuel pressure would be 11 ½ to 12 lbs. The floats used in the carburetor on a blow thru supercharger must be made of nitrophyl or of some other solid material, brass or hollow plastic floats will collapse from the pressure the supercharger puts into the fuel bowls. The 2 main ways of pressurizing or blowing through the carburetor are #1 where the carburetor is in a pressurized box and #2, is the use of a hat in place of the air cleaner on top of the carburetor. If the carburetor is not inside of a “box” but using a hat to pressurize the carburetor bowls & venturii, the throttle shafts will have to have seals installed to keep the fuel from blowing out thru the clearance in the throttle shaft. We always recommend a marine type of flame arrestor be used inside the air box or hat to defuse the air-charge, if this is not used the air charge blowing from just one side of the carburetor will cause the air/fuel mixture to be incorrect as the boost changes."
If you are running a pull through carb, on top of the blower: "An engine using a carburetor on top of a supercharger uses a standard set up for fuel pressure; the fuel pressure we use most is 5 ½ to 6 psi. The most important point is to use a high volume fuel pump along with fuel lines large enough to keep fuel pressure constant at all engine loads. "

From the article, it sounds like if you have a blow through system, your current pump is ample. Hope the engine was originally built to be blown and that you have a carb that is copacetic to running with a blower. Bad things can happen, otherwise.






The

[Gaz64]

Originally Posted by mnm99

My car is boosted and need more than 12PSI. Asking how high it will go up to. I don't have a FP gauge yet so I cant check for myself yet.

Running a boosted carb without a fuel pressure gauge is flaunting with danger.

Your pump is factory set at 12PSI. Edelbrock makes no mention of how high you can go. You could probably get 20 PSI at the pump bypass or locked out. Then you also need a boost referenced pressure regulator as above.

[BevanWright]

I found the instruction manual. Doesn't say how much it can produce, but you turn clockwise to increase pressure. It also recommends adding a gauge. Looking at websites 15psi is pretty common.