SPONSORED LINKS

1999 Dodge Ram No b+ power to fuel pump

Tiny
SIMEON9237
  • MEMBER
  • 1999 DODGE RAM
  • V8
  • 2WD
  • AUTOMATIC
  • 132,000 MILES
My 2500 P/U will run is I pour gas in intake but cuts of when it runs out. "0" fuel pump pressure at fuel rail. 1st pulled fuel pump thinking it was bad but after testing with external 12v power, pump appears to working fine. Re0installed pump but again no pressure to fuel rail.

At key "On", I don't hear the pump priming so I thing I have an electrical problem. Checked relays for both fuel pump and Automatice Shut-off and they seem tio be working.

Are there any other electrical checks that can be done to determine root cause of lack of B+ volts.
SPONSORED LINKS
Tuesday, June 8th, 2010 AT 12:43 PM

1 Reply

Tiny
INTERNETMECHANIC
  • MECHANIC
  • 700 POSTS
I'd check the voltage circuits to and from the fuel pump relay. Did you check for proper voltage and ground at the proper terminals at the fuel pump connector, engine cranking? At the fuel pump relay, terminal 30 is hot all the time. Terminal 86 is voltage for the coil side of relay, goes hot when you turn on the key. Terminal 85 is ground for the coil side of relay, controlled by the pcm. Terminal 87, when relay is energized, carries voltage to the fuel pump.


https://www.2carpros.com/forum/automotive_pictures/512072_dodge_2500_1.jpg

SPONSORED LINKS
Was this
answer
helpful?
Yes
No
+1
Tuesday, June 8th, 2010 AT 4:17 PM

Please login or register to post a reply.

Related Fuel System Fuel Pump Fuel Pressure Content

VIEW MORE

Sponsored links