 can/does a fuel pump, pump air?, bear with me.... |
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| type47 |
 Aug 25 2006, 05:51 PM
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Viermeister  Group: Members Posts: 4,254 Joined: 7-August 03 From: Vienna, VA Member No.: 994 Region Association: MidAtlantic Region  |
if you started with an empty fuel tank and hooked up all the hoses and lines for a D-jet fuel pump in stock position under the battery and then you put gas in the tank.... (finally getting to the point)... wouldn't you trap some air in the fuel line between the tank and the pump? if you run the pump, as in trying to start the car, would the pump eventually pump the air out and start pumping gas?
i think i might put gas in the tank and open the fuel line at the filter to get the air out. |
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| TravisNeff |
Aug 25 2006, 05:55 PM
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914 Guru Group: Members Posts: 5,082 Joined: 20-March 03 From: Mesa, AZ Member No.: 447 Region Association: Southwest Region 
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It will pump air, air is a fluid as well.
I have never had a problem with putting in a fuel pump - and have to prime it with fuel. |
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| SLITS |
Aug 25 2006, 05:56 PM
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"This Utah shit is HARSH!" Group: Benefactors Posts: 13,602 Joined: 22-February 04 From: SoCal Mountains ... Member No.: 1,696 Region Association: None  |
Since the pump is lower than the outlet of the tank, it is a "flooded suction". The fuel will displace the air as it flows into the line.
A fuel pump....rotary or solenoid design ... is not a good air pump ... hence the need for the pump to feasibly be near the tank and lower. They are better at pushing than sucking. A diaphram pump (mechanical) is esentially sealed and can be mounted a distance away and higher than the outlet of the tank as they are considered a sucker and can pump air readily. Which is why a lot of cars utlizing a electric pump have a booster pump in the tank .... a submerged pump if you wish to feed the main fuel pump. |
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