Yep, that's just what I was thinking.Paul Wright said:If you put a straw into a glass of water but not to the bottom, you can still "suck" the water up the straw. Most people assume that you are drawing in the water, but it's actually being pushed up the straw by 14.7 pounds (at sea level) per square inch of ambient air pressure.
Most mechanical pumps create "suction" or a low pressure like the straw example. Atmospheric pressure pushes the fuel into this low pressure.
Electric pumps are better at pushing fuel out than "sucking" it in, plus they need a steady supply of fuel to keep the pump cool. That's why you see in-tank electric pumps. Pump is kept primed and cool.
hey thanks. now I understand what PW was trying to say.the fule pump is creating a low pressure area on the inlet to the pump , pressure goes from high to low so the fluid will go toward the low pressure. Then once the pump is primed it should keep ok. The pump would do better with more " head pressure " by being located at the same height as the sump.
thanks for the info. this is what I wanted to knowOn my car when I ran the electric pump it was above the sump but below the fuel in the tank. The weight of the gas in the tank would push fuel out of the line going to the pump. It worked fine until the tank got really low on fuel then it would go dry. The pump inlet was 2-3 inches above the sump.
Getting the pump low enough to work right without putting a fuel cell in the trunk is one of the main reasons I went to a mechanical pump.
I had not thought of this. thanks.If you put an electric pump in the trunk it will sound very loud. The trunk will act like an echo chamber.
?????????? what's wrong if someone see's it? You would have to be looking for it, on your hands & knees, or driving behind you.Im not comfortable having a 500 dollar pump and filter setup hanging in the air for all to see.
is there anything that can be done to cut down on the sound?
Haa!! Now thats funny. Why?? Cause hell, when my engine is running you dont hear the fuel pump. LOL All you hear (and feel) is engine, its not a Honda. Guess if I had a honda engine I would be thinking about fuel pump noise. But NOPE, the small block makes enough sound to drowned out any simple fuel pump noise.What cha say mike???????can't hear ya, your damn pump is too loud! :d can't you hear that! Rm
Ive thought about this, but I have a plastic cell and I heard that its not a good idea to not have it well supported.Do you have a cell in the trunk? If so, why not just build a stand out of 1x1 steel tubing that you can get at the local hardware store adn mount the entire cell, sump and all, in the trunk. Then you'd have nothing hanging down outside the car, and wouldn't have to worry about this problem. I used a couple peices of 2" square tubing that I laid down on the trunk floor, then ran the bolts thru my cell straps, thru the tubing, and thru the trunk floor, bolting it all together and to the trunk floor at the same time. The only thing showing under the car was 4 bolt heads. Then I ran my fuel line out thru a body plug.