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colts fan
Dodge Dakota
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12/31/2003
15:44:11

Subject: 94 Dakota 3.9 fuel presure problem
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Recently replaced the fuel pump and now the fuel system is not staying preasurized. Start the truck and the fuel preasure is normal, but when you shut the truck off, there is absolutely no preasure in the system. Also since replacing the pump the check engine light comes on, flashes code for O2 sensor stuck in the rich position. Replaced the O2 sensor but still have the same problem with the check engine light. The truck runs great, but it is hard to start after it has been sitting for a while. Is there a check valve in the pump that may not be working? Or could I have been givin the wrong pump? Other than that, at 221,000 miles she runs like a top. Any help would be greatly appreciated guys. Thanks



Jon
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12/31/2003
18:30:04

RE: 94 Dakota 3.9 fuel presure problem
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If the system is not staying pressurized and you are having trouble starting it one or more injectors are probably leaking down. Pinch off the fuel line between the fuel rail and the pump, if you are still losing pressure you know the problem is probably with the injectors. If you are confident you know what you are doing you could pull the fuel rails and all the injectors out to see if they drip with the system pressurized and the truck off. If a injector is bad your best bet is to replace them all because the others are close behind.

-Jon



whitedakota2
Dodge Dakota
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12/31/2003
19:15:58

RE: 94 Dakota 3.9 fuel presure problem
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I agree whith Jon, sounds like a leaking injector.

Check with Bruce at http://www.fiveomotorsport.com for new injectors for a great price.



colts fan
Dodge Dakota
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12/31/2003
19:51:15

RE: 94 Dakota 3.9 fuel presure problem
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Thanks guys for responding to my question. I thought about leaking injectors, but I had to relieve the pressure off the system before I removed the old pump. Since replacing the pump the system will not hold any pressure when the truck is not running. I mean immediately after you turn the key off, all of the pressure is gone to zero. For it to lose that much pressure that quickly, all of the injectors would have to be stuck open don't you think? And if the injectors were leaking wouldn't it run rough when you started it from excess gas in the cylinders? It is hard to start after it sits, but when it fires up it runs very smooth. Something tells me that there is something not right with the fuel pump. Somewhere in the system there must be a check valve to keep the fuel from running back into the tank. Could it be in the pump itself and not closing? Just some thoughts.



whitedakota2
Dodge Dakota
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12/31/2003
19:58:14

RE: 94 Dakota 3.9 fuel presure problem
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Then it is a bad pump and I bet it is not a Chrysler pump.

The valve is in the pump.

The Chrysler ones are the best, in this case, to use.






colts fan
Dodge Dakota
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1/01/2004
10:20:17

RE: 94 Dakota 3.9 fuel presure problem
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Thanks guys, I'll take the pump back and get another one. No it's not a Chrysler pump. I got it from Pep Boys. It's a carter pump so I assumed it was a quality part. Maybe not. I'll swap it out and let you know. Thanks so much for your help.



ed starkweath
Dodge Dakota
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10/12/2004
11:16:09

1993 dodge dekota sport 3.9
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i have a 1993 dodge dekota sport v6 3.9. when the temperature is 50 degrees or below it won't
start.once it starts it'll keep starting. the
pressure to the fuel pump is good. if you wiggle
the key in the switch it starts some times. what
could the problem be? i was told maybe the fuel
valve is bad. or switch is bad. but why does it
start when the temp. is sixty or above..



Verde SAR Dog
Dodge Dakota
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10/12/2004
16:44:45

RE: 94 Dakota 3.9 fuel presure problem
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The check valve for the fuel system is in the filter regulator on top of the pump. Did you get a new one with your new pump? you should have. and a new sender for your fuel gauge too. I just got a new pump from NAPA for my 94 V6, same brand as origional inculded the complete assy. pump, sender unit and filter/regulaotr



P2gee
Dodge Dakota
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10/12/2004
18:51:25

RE: 94 Dakota 3.9 fuel presure problem
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Nothing wrong with a Carter pump, have installed many with no problems. Before you get too excited about carrying the pump back to get another one, you might want to double check the pressure side fuel line inside the tank to make sure clamps are tight and the hose is not damaged. Could have a pressure leak in the tank.



ed starkweath
Dodge Dakota
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11/03/2004
19:41:58

RE: 94 Dakota 3.9 fuel presure problem
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i have 1993 dakota sport v6 3.9. when the temp
is 50 or below no start. it turns over very good.
but not getting gas. if i wiggle the key sometimes it starts. also if i put a heat lamp
near the sensor or injectors it'll start. the
fuel pressure is good. it isn't getting power to the pump. once it starts no problem starting
it after that till the next day. what could my
problem be. could it be the fuel pump. some people
say no. hope to hear what you thibk...tks...



?
Dodge Dakota
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11/04/2004
13:11:18

RE: 94 Dakota 3.9 fuel presure problem
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ed -=- check wiring under the fusebox underhood
look for a splice of 3 or 4 wires
check carefully - redo if looks even a little
loose or corroded



Dean
Dodge Dakota
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11/05/2004
20:10:49

RE: 94 Dakota 3.9 fuel presure problem
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These pumps are usually only sold as assemblies. The pressure regualtor should have come with it, but it can be purchased seperately from Dodge for about 55 bucks. Don't just get a pump and try to attach it...the small nylon line require special clamps and tools, and they can not leak! If you try to take the thing apart and put in a new pump only, you probably won't get it together right. I've seen people try to use hose clamps on these! Be gentle with the sender unit as well, they are easily damaged.



GREG
Dodge Dakota
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12/15/2010
22:32:55

RE: 94 Dakota 3.9 fuel presure problem
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Message:
I'm looking for "Colts Fan" to see if he ever resolved his issue
with the fuel pressure bleeding off immediately upon engine
shutdown. Last post from "Colts Fan" says he was going to
replace his fuel pump assembly. I have a 93 Dakota with the
exact same problem


colts fan
Dodge Dakota
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1/01/2004
10:20:17
RE: 94 Dakota 3.9 fuel presure problem
IP: Logged

Message:
Thanks guys, I'll take the pump back and get another one. No it's
not a Chrysler pump. I got it from Pep Boys. It's a carter pump so
I assumed it was a quality part. Maybe not. I'll swap it out and
let you know. Thanks so much for your help.


colts fan
Dodge Dakota
JOIN HERE


12/31/2003
19:51:15
RE: 94 Dakota 3.9 fuel presure problem
IP: Logged

Message:
Thanks guys for responding to my question. I thought about
leaking injectors, but I had to relieve the pressure off the system
before I removed the old pump. Since replacing the pump the
system will not hold any pressure when the truck is not running.
I mean immediately after you turn the key off, all of the pressure
is gone to zero. For it to lose that much pressure that quickly, all
of the injectors would have to be stuck open don't you think?
And if the injectors were leaking wouldn't it run rough when you
started it from excess gas in the cylinders? It is hard to start
after it sits, but when it fires up it runs very smooth. Something
tells me that there is something not right with the fuel pump.
Somewhere in the system there must be a check valve to keep
the fuel from running back into the tank. Could it be in the
pump itself and not closing? Just some thoughts.




GREG
Dodge Dakota
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 Email

12/15/2010
22:35:03

RE: 94 Dakota 3.9 fuel presure problem
IP: Logged

Message:
I'm looking for "Colts Fan" to see if he ever resolved his issue
with the fuel pressure bleeding off immediately upon engine
shutdown. Last post from "Colts Fan" says he was going to
replace his fuel pump assembly. I have a 93 Dakota with the
exact same problem


colts fan
Dodge Dakota
JOIN HERE


1/01/2004
10:20:17
RE: 94 Dakota 3.9 fuel presure problem
IP: Logged

Message:
Thanks guys, I'll take the pump back and get another one. No it's
not a Chrysler pump. I got it from Pep Boys. It's a carter pump so
I assumed it was a quality part. Maybe not. I'll swap it out and
let you know. Thanks so much for your help.


colts fan
Dodge Dakota
JOIN HERE


12/31/2003
19:51:15
RE: 94 Dakota 3.9 fuel presure problem
IP: Logged

Message:
Thanks guys for responding to my question. I thought about
leaking injectors, but I had to relieve the pressure off the system
before I removed the old pump. Since replacing the pump the
system will not hold any pressure when the truck is not running.
I mean immediately after you turn the key off, all of the pressure
is gone to zero. For it to lose that much pressure that quickly, all
of the injectors would have to be stuck open don't you think?
And if the injectors were leaking wouldn't it run rough when you
started it from excess gas in the cylinders? It is hard to start
after it sits, but when it fires up it runs very smooth. Something
tells me that there is something not right with the fuel pump.
Somewhere in the system there must be a check valve to keep
the fuel from running back into the tank. Could it be in the
pump itself and not closing? Just some thoughts.




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