[dh114]

Just bought a 2003 base Town & Country with a 3.3L (not flex-fuel) motor. Previous owner said he was told it needed a fuel filter. I checked codes and all that shows up is P0171. I replaced the fuel filter and erased the codes. The P0171 has come back. I figured I'd better check the fuel pressure, but can't find the test port. After doing some web surfing I found a post that said the port is on the front injector rail. I removed the intake plenum, but can't find any port. I've even followed the fuel line from the injector rail back to where it goes down and under the cabin.

Anyone know where to find the port? Or, does it actually have one?

Thanks for reading,
Danny

http://www.ebay.com/itm/Chrysler-3-3L-3-8L-Fuel-Rail-4861498AD-/350563921513?pt=Motors_Car_Truck_Parts_Accessories&hash=item519f3cee69&vxp=mtr

This rail looks like the one in my T&C. I sure don't see a test port.

 

[ImperialCrown]

The vehicle may not have a service port in the fuel rail for fuel pressure. The Miller tool #6539 (or equivalent) is needed.
http://www.toolsource.com/fuel-pressure-adapter-p-101306.html
You may be able to put something together at an auto parts store or hardware store.

Diagnose for P0171:

P0171-1/1 FUEL SYSTEM LEAN​

When Monitored: With the engine running in closed loop mode, the ambient/battery​

temperature above 20 deg. F and altitude below 8000 ft.​

Set Condition: If the PCM multiplies short term compensation by long term adaptive and​

a certain percentage is exceeded for two trips, a freeze frame is stored, the MIL illuminates​

and a trouble code is stored.​

POSSIBLE CAUSES​

GOOD TRIP EQUAL TO ZERO​

RESTRICTED FUEL SUPPLY LINE​

FUEL PUMP INLET STRAINER PLUGGED​

FUEL PUMP MODULE​

O2 SENSOR​

O2 SENSOR SIGNAL CIRCUIT SHORTED TO GROUND​

O2 SENSOR HEATER OPERATION​

THROTTLE POSITION SENSOR VOLTAGE GREATER THAN 0.92 VOLTS WITH THROTTLE​

CLOSED​

TP SENSOR SWEEP​

MAP SENSOR OPERATION​

ECT SENSOR OPERATION​

ENGINE MECHANICAL PROBLEM​

FUEL FILTER/PRESSURE REGULATOR (HIGH)​

PCM

 

[fjb37]

My 92 Caravan 3.3L & my 95 LHS 3.5L had a test port as does my 94 GC 3.3L. Looks like Chrysler found another way to save a buck or two.

I'm keeping my 94 until the wheels fall off. At 90K miles it should last for a few more years, Just my $0.02.

FredB

 

[dh114]

Hello Again,

Thanks for your replies. What I finally figured out is remove the rubber fuel line from the rail to the metal one that goes under the cab. Then I installed my pressure gauge using rubber fuel hose.

I found the pressure with the motor idling is 32 or 33 psi. When I give it gas it briefly goes down to 30 psi. According to my manual it should be about 49 psi. When I shut off the motor the pressure slowly goes down. I did notice when I first turn the key on there is a buzzing somewhere on the passenger side of the motor. I tried to listen and also feel, thinking there may be a vibration while whatever is buzzing, without any luck.

Any suggestions to what to do or check next. I've already replaced the fuel filter.

Danny

 

[A.j. Schreiber]

I'd start thinking about the fuel pump, although it is pumping it's obviously not at the correct PSI. Perhaps the seals or bearings have started to wear not allowing it to maintain pressure. when you shut it off does the pressure gradually go to zero?