|09-20-2012 08:38 PM|
|Cape Cod Bob||
After reading lotsa info on this when I put in my electric pump , the consecus was that a 7=8 lb pump running to a 4 lb reg will be OK without the return line. I used a napa pump .
How old is your pump? I was told by an napa old timer that they don't last to long. Maybe you just need a new one.
|09-19-2012 09:09 PM|
OK so I am going to resurrect an old thread. My 1969 911 has an electric fuel pump mounted in the engine compartment. It is feeding a pair of weber carbs so I am running the fuel pressure at 4psi and it is controlled by an adjustable regulator. This was the factory installation so it has been this way for a long time, it is pulling the fuel through rather than pushing.
I am running into a situation where the fuel pressure will intermittently drop to 1.5 to 2 psi. When this happens my wide band o2 sensor will show AFR greater than 15.6.
I am going to relocate the fuel pump and mount it at the base of the tank and push the fuel through vs pull, which is how it is operating now. I am not sure if my pump is failing, if it is sucking air or vapor locking.
After reading this thread and a few others the general consensus is electric pumps operate better when pushing. I know my car came from the factory with the electric pump pulling but the modern fuel blends may be playing a part in the problem.
OK so now the real question, should I add a return line for the tank while I am at it? Is a return line needed on a carb setup? I assume not since it never had one but best to check first.
|12-31-2010 05:28 PM|
|Torque454||Lower than the fuel tank and as close to it as possible.|
|12-30-2010 11:12 PM|
|inrc||Ok understood. thanks|
|12-30-2010 10:04 PM|
|nastynova||I was trying to simply state that your quote it correct... and the other placements in incorrect places can lead to problems... that all...|
|12-30-2010 10:01 PM|
|12-30-2010 07:53 PM|
|12-30-2010 04:17 PM|
|airboat||Best place is behind fuel tank and lower. Can't always have best... Will it work... Sure...Could it cause problems, Sure...|
|12-30-2010 04:17 PM|
|WDCreech||Electric pumps push better than they pull, so the best place for one would be slightly lower than the tank outlet, but close.|
|12-30-2010 04:12 PM|
Best place to install electric fuel pump?
Will the edelbrock fuel pump 1791 work well installed by the engine rather than the fuel tank?