1991 Dodge Dakota Acceleration Misfiring

Hi
First, does the truck misfire or feel like it's running out of power? If it's a misfire, it sounds electrical to me. However, if the truck runs out of power, you may be right; it could be the fuel pump. Try driving the truck up a long hill where the engine has to work hard and use a lot of gas. If it starts to die, my guess would be the fuel pump.

When you say a misfire, is it a backfire. If so, is it through the exhaust or the intake?

Joe

I forgot to mention. If the fuel pump is bad, the easiest way to replace it is to remove the truck's bed. I believe there are only eight bolts that hold it on to the frame. But, you will need some help getting it off the frame.

Hi again:

How many miles does the vehicle have? Has the oil been changed on a regular basis? Also, from your description, it really does sound like the fuel pump. I'm asking the other questions so I can eliminate other potential causes (burnt valves, low compression.)

You know the vehicle, therefore you know better than I do if the potential for internal problems exist. If they don't, I agree with you and would recommend that you have a fuel pump pressure and volume test done to be sure it is bad. If you need help doing that, let me know and I'll try to get the specs for your vehicle and tell you how to do it. Checking fuel pressure and volume requires special tools and could potentially be dangerous if the engine is hot, or you are around anything that could ignite the fuel.

Let me know, and I'll do my best to help you.

Joe

Have you ever replaced one in a Dakota? If not, I recommend that you remove the bed rather than trying to get the tank out. The plastic tanks are very easy to crack, and the straps are usually so rusted, they are almost impossible to remove without breaking. There are 8 bolts that holld the bed on. Just disconnect the wiring for the lights, take the 8 bolts out, and have someone help you take the bed off. It's really easy after that. You have complete access to the tank, fuel lines and power. Just be careful when you disconnect the fuel lines. They may still be under pressure causing fuel to spray everywhere. Also, the plastic retainers are easy to break, so be easy with them. Finally, before you remove you old pump, clean the top of the tank or you'll have dirt all through the tank. It is a pain to try to clean it.

I woud like to hear how it goes for you. I feel confident you're on the right track. Email me back to let me know if it fixes your problem. If not, we'll go from there.

Good Luck and let me know if you have any other questions.

Joe

Now you have me confused. Since the vehicle wouldn't turn over or anything, it sounds electrical. I have to ask you a stupid question. Have you checked the vehicle grounds? Does everything look ok? I don't remember if I asked about any codes. When the truck dies and doesn't restart, does it ever turn over for you?

Let me know before I loose my mind along with you. This is a difficult one that not being there even makes harder.

If the starter is good, all connections are good, and everything seems fine, I think we need to consider the ECM. Just out of curiosity, have you played around with any of the relays?