No power to Fuel Pump (New engine)

CorrupTTalon · 10-04-2008, 10:19 AM

what ive read from previous posts is that the power comes when youre turning over the engine.

that is fine, however i unplugged the line where it meets the injector rail and no fuel came shooting out.

another thing i picked up was the crank sensor and how it controls the fuel pump?

the crank sensor is pretty new, in fact the whole engine is new

Questions

Will any connectors make the pump not work? other than the crank sensor connector? perhaps i connected the wrong connector to something? O2? etc? will this cause the fuel not to pump? maybe something with security? ABS connector?
What about air lines? perhaps i connected something wrong?
What controls this via fuse? MPI? is it a switch? how can i trouble shoot it.
Any other hint is appreciated!

jongreene · 10-04-2008, 03:14 PM

fuel pump relay.

T is for TURBO · 10-04-2008, 03:25 PM

I agree, I would start by checking the fuel pump relay. I doubt your MPI went bad as they are pretty rugged... ***WRONG*** Also, something you should know. When you put the key in the ignition and turn it to ON the fuel pump should get power for about 1-3 seconds to prime the fuel system. ***WRONG***

Get a good circuit tester and start tearing into it!

Good luck and have fun!

Electrial problems are usally a PITA, especially if you're like me and are a tard when it comes to anything electrical. But from my experiance, the problem is usually something stupid... (like a loose wire or connector)

kenamond · 10-04-2008, 07:41 PM

Quote:

Originally Posted by T is for TURBO

I agree, I would start by checking the fuel pump relay. I doubt your MPI went bad as they are pretty rugged... Also, something you should know. When you put the key in the ignition and turn it to ON the fuel pump should get power for about 1-3 seconds to prime the fuel system.

Get a good circuit tester and start tearing into it!

Good luck and have fun!

Electrial problems are usally a PITA, especially if you're like me and are a tard when it comes to anything electrical. But from my experiance, the problem is usually something stupid... (like a loose wire or connector)

The fuel pump is not turned on until the ECU is getting pulses from either the cam angle sensor or the crank position sensor (i.e. the motor must be turning over). It will *not* turn on with the ignition in the "on" position and engine not running. This is a common misconception, and it'd be good for folks to not spread this misinformation.

T is for TURBO · 10-04-2008, 08:45 PM

Quote:

Originally Posted by kenamond

The fuel pump is not turned on until the ECU is getting pulses from either the cam angle sensor or the crank position sensor (i.e. the motor must be turning over). It will *not* turn on with the ignition in the "on" position and engine not running. This is a common misconception, and it'd be good for folks to not spread this misinformation.

I stand corrected, I failed to see he has a 2g... Reading>Me

kenamond · 10-04-2008, 09:57 PM

Quote:

Originally Posted by T is for TURBO

I stand corrected, I failed to see he has a 2g... Reading>Me

As far as I know, the 1g turbos don't turn on the FP until they get cam or crank sensor pulses either.

T is for TURBO · 10-04-2008, 10:30 PM

Quote:

Originally Posted by kenamond

As far as I know, the 1g turbos don't turn on the FP until they get cam or crank sensor pulses either.

Damn... I'm 0-2 today... For some reason when I worked on my buddy's 1g, I thought that it would prime the system when the ignition was on... But evidently, after looking into it a little bit, the 1g doesn't prime the fuel system either... I wonder what planet I've been on all these years?

Thanks for the clarification!

shawnmr · 10-05-2008, 07:15 PM

make sure to test it while your cranking

luv2rallye · 10-05-2008, 11:56 PM

Quote:

Originally Posted by T is for TURBO

Damn... I'm 0-2 today... For some reason when I worked on my buddy's 1g, I thought that it would prime the system when the ignition was on... But evidently, after looking into it a little bit, the 1g doesn't prime the fuel system either... I wonder what planet I've been on all these years?

Thanks for the clarification!

Well if you had said a 2g NT you would have been right. Chrysler always does things a little different.

CorrupTTalon · 10-06-2008, 06:47 PM

as stated in my initial post, i already tested if there was power to the pump while cranking over and that i am aware of the fact that the power comes from the crank sensor while the engine is turning over..

also my profile explicitly states that i have a second gen.

if you read the bold points, youll notice that i am looking deeper than the generalized responses.

thanks for the replies

19TSI95AWD · 10-06-2008, 07:31 PM

Have you tried to test it with the fuel pump check sensor on the firewall to make sure your pump is getting powered?

CorrupTTalon · 10-06-2008, 08:25 PM

Quote:

Originally Posted by 19TSI95AWD

Have you tried to test it with the fuel pump check sensor on the firewall to make sure your pump is getting powered?

is that the sensor opposite of the battery? the one that connects to the stock FPR solenoid?

if i had the air connections wrong would it cause this?

CorrupTTalon · 10-12-2008, 11:56 AM

anyone have any ideas?