Could it be the fuel pump?

SOURCE: 1989 dodge Ramcharger stalls

Hi Monkeypaint!
I assume you have power brakes and I gather that it idles properly at times, but dies when the brakes are applied. This sound like a leaking power brake assist vacuum line or diaphram. You can verify this by locating the big vacuum hose connecting the intake manifold to the assist diaphram. This will be about an inch in diameter connected to the round item behind the brake master cylinder next to the firewall.

1. Disconnect the line at the intake manifold end, and plug the vacuum port on the manifold with a tapered rubber stopper or cap.
2. Being aware that you now do NOT have power assist to the brakes (requiring CONSIDERABLY more pedal pressure to stop!!!), see if the problem goes away. If it does, you have narrowed it down to the assist diaphram or the hose. If it still persists, it is an engine tuning/control issue, not related to brakes.
3. Do determine whether it is the vacuum hose or the cannister, remove the previously installed cap/plug, reinstall the hose to the intake manifold, disconnect it from the diaphram and plug/cap the hose at that end. Repeat step three... if the problem returns, the hose is leaking and should be replaced... If the problem still goes away, the Power Brake Assist Diaphram Cannister is leaking excessively and should be replaced.

• ***ALSO*** Any other vacuum lines leaking can lower the manifold vacuum to a threshold level where the load of power brake assist actuation crosses the line for adequate vacuum to idle*** So check all vacuum lines underhood, looking for a pronounced hissing at vacuum leaks. A manifold vacuum gauge is a relatively inexpensive diagnostic tool that could also be useful.

SOURCE: 2003 Dodge Ram 2500 Cummins Diesel

there is a technical service bulletin to relocate the fuel pump on this vehicle when the transfer pump needs replaced. there is the possibility the transfer pump is going bad on the 2003 now...its not good to run them low or out of fuel

Dar

• 2007 Answers
• Posted on May 17, 2009

SOURCE: 92 dodge 318 truck engine runs til you stop, then stalls when put

Then i think i'd be dumping some soapy water on the intake gaskets checking for leaks. ANd wiggle the **** out of all vacuum hoses. ( you probably did that) And if there aren't any, your cam could be tired. You got a tough one there. Hard to figure with a keyboard.

SOURCE: loacte the fuel filter on 2000 dodge durango 4.7 liter v8

if i am not mistaken the fuel filter is built into the fuel pump. which requires you to drop the tank and replace both.

Mike Butler

• 6674 Answers
• Posted on Jun 05, 2009

SOURCE: 03 dodge ram 1500 hesitates and tries to stall

Remove IAC (idle speed control) motor, clean with throttlebody spray cleaner & the port (hole)it came out of. Re-install & try it. If it cures it for a while & does it again, replace the IAC motor.