New fuel pump question

[barry]

OK Guy's

Replaced fuel pump, and filter and hoses, should it be necessary to pour fuel in the lines to eliminate the air that may cause vapor lock, or should the pump be able to handle it, my concern is vapor lock.

Let me know what your thoughts are.

Thanks
Barry

OK so I tried to pour fuel in line and still nothing. The fuel pump has no power even in start position. The wires to the gauge work perfect. I changed the harness before I had this problem, prior to the harness change the car ran perfect. I have a question that I might have wired something wrong. Here is the question- There is a wire that runs along the battery wire from the rear of the car, is that wire supposed to go to the lower nut on the fire wall battery block. I have an electrical problem with the fuel pump, the car turns over, no gas smell, pump does not work, seems there is no power to the pump motor only. Fuse 11 is ok fuel pump relay is new, pump is new, etc

If there is someone in or near Plano, Texas let me know. 1-954-980-0296

Thanks for your help
Barry

[navid41691]

From what I understand of vapor lock, you don't have anything to worry about as your engine or other components aren't hot enough to turn the liquid gasoline to vapor.

Can anyone else confirm this?

[barry]

From what I understand of vapor lock, you don't have anything to worry about as your engine or other components aren't hot enough to turn the liquid gasoline to vapor.

Can anyone else confirm this?

Sounds right, because my pump does not work, mine is electrical problem..

Barry

[Click]

The fuel pump only runs when its needed (to meet the required pressure) and is controlled via the DME via the fuel pump relay. Just because the key is on the on position doesn't mean the pump is running. Pull the fuel line off the fuel rail and place it into a container and manually jump where the fuel pump relay plugs in. You should get fuel coming out in no time. That will reduce that amount of air in the lines greatly.

[barry]

Ok sounds like a plan, which prong holes would I use 87 & 30?
Thanks for your input,
Barry


OK jumped the fuel pump and the pump was running but no gas after 10 seconds, decided to remove gas filter to see if fuel was present. I will let you no later what happened.

OK removed fuel filter, tried to jump fuel pump relay from underneath the relay, could hear the pump running but no fuel came out the hose where I removed filter. Also tried the same with ignition on and no gas. tank has at least six gallons of gas in it. Which line is the fuel line Upper or lower?

Any help is appreciated.

Thanks
Barry

[ScottyB326]

From what I understand of vapor lock, you don't have anything to worry about as your engine or other components aren't hot enough to turn the liquid gasoline to vapor.

Can anyone else confirm this?

Gasoline produces gaseous vapor at -45 degrees F, so unless it's reallllllly cold day you're gonna make vapor.

They mean more air than anything. And yeah you can pop the line off to bleed it but a cleaner/faster/easier way is to spray a lil carb cleaner in to fire a few cylinders which sucks the gas right in

[jlevie]

The fuel system is a flow through design with fuel always circulating from the pump to the rail through the FPR, and back to the tank. So it is almost impossible to have vapor lock that persists more than a few turns of the engine. In a like manner any air in the lines or rail will be cleared by the first few turns of the engine.

[Bimmerista]

Let me know if you need any further assistance. I work in W Plano & I'm usually traveling b/w the hosptials in the Plano, Frisco, & Carrollton area.