electric fuel pump

i've checked the screen in tank blue it out cleaned tank,the fuel pump is mounted about four feet from tank i got a holley hp-125 pump supposed to be self regulating and my pressure is around 5 pounds could gauge be wrong or does the pump have to be closer.? this is the third pump i've put on trying to get consistant 7 pound.it just about has me drove crazy

How far from the pump to the carb? What size line? A Holley 125 isn't a lot of pump if you are going long distances. Where are you checking the pressure? All play into the pressure game.

it is half tone truck pump is right by the transfercase so about 7-8 feet i guess,3/8 line i have inline holley gauge bout foot infront of carb

I'd try to check pressure at the pump with a different gauge. Then you would know if it's the pump or the gauge. Would also tell you if it's line loss. Might not hurt to test the pump for volume. Get an open container that will hold at least a gallon. Run the hose or hoses from your carb to the container. Have someone switch on your pump and time how long it takes to pump a gallon. A high ten second car would need to fill it in 25 seconds or less. If yours isn't doing it, I'd say you need a bigger pump or another 125 in tandem. Just some thoughts, I'm sure someone else will chime in.

I would try to mount the pump closer to the tank. Electric pumps are better at pushing than pulling.

kplante, I went through 2 Holley pump's in 6 month's. So I switched to Aeromotive and a return style fuel system. Sound's like you should move your pump closer to the tank. Here's a picture of the set up I'm running. The vehicle is a 78 Ford Bronco.

http://www.supermotors.net/getfile/466369/fullsize/dsc01455.jpg

http://www.supermotors.net/getfile/531593/fullsize/dsc02067.jpg

http://www.supermotors.net/getfile/531596/fullsize/dsc02070.jpg

http://www.supermotors.net/getfile/531594/fullsize/dsc02068.jpg

kplante,
Just reread your post and I agree, move the pump as close to the tank as possible. As Doug said, they push much better than they pull. I'd still check the pressure at the pump.

AAAAAAAA don't you have the rear sump on backwards? if you get a hard launch it will take the fuel away from the sump and starve the pump!!! It is suppose to be turned flat lower to the back so when accelerating it pushes the fuel back to the sump...and will stay in the lower section... when hard acceleration is hit it will flow the fuel up out of the sump and not be fun unless you keep the tank full at all times...



Randy

don't you have the rear sump on backwards

Yup, looks like it to me 8)

I was thinking the same thing lol.Looks like a good clean install other than that.He probably has a good reason for it.

I think Doug's correct as the pump should be closer to the tank then mentioned.

I wonder if the pump is seeing 12 volts as well? I didn't see any mention as to the type of fuel filter befor the pump?

My Mustang has AN10 line to the filter from the tank. Then from the filter it has AN8 to the inlet side of the pump. It goes then to AN8 to 1/2 aliminum line. I'm using a return system and Areomotive pump.. I'd say total fuel system (fittings, line, pump & regulator) cost about $600 if not a little more..

Pic of pump at the rear with filter assy..
http://i118.photobucket.com/albums/o115/wildfire466/pump1.jpg

http://i118.photobucket.com/albums/o115/wildfire466/pump.jpg

http://i118.photobucket.com/albums/o115/wildfire466/reg1.jpg

http://i118.photobucket.com/albums/o115/wildfire466/carb1a.jpg

Laters!

http://i118.photobucket.com/albums/o115/wildfire466/Img00235.jpg

I orginally had the sump installed the other way with tho outlet's facing the rear and the pump mounted by the outlet port's. We'll I got rearend by a car and it took off the pump and the sump in the tank.(big mess, I had 12 gallon's of gas that came pouring out of the tank) My Bronco suspension is lifted 9 inche's with 38" tire's, so as you can imagine the car's nose went under the truck and did the damage. So I decided to mount the sump the other way and move the pump and lines more under the truck to be better protected. Now as far as a starving issue, there is none. I was wondering the same thing at first, but I've taken my Bronco to Silver Lake MI and climbed those dune's with only a quarter tank of fuel in the tank with no starving problem's at all. I get told by alot of people the same thing about the sump though.

cougar1969, blastertech70, mustangz911, Good eye's fella's. I wish I could take you all for a ride up the dune's and you would probably be surprised that it's doesn't starve.