Dying Truck--fuel Issue?

[Colorado Chem]

I have a k1500 Silverado 4.8L. I going up a mountain pass, and lost power. When I pushed the accelerator, nothing happened, my engine just slowly died. It restarted I got it to a gas station although very sluggishly. (gauges looked okay) When I tried to restart it it wouldn't start. The check engine light was NOT on. A friend of mine came to pick me up about an hour later, and asked me to start it see what happens. It started fine and I was able to drive home (downhill). I assumed a fuel issue. I just filled the gas tank and wasn't out of gas, It happened speratically so I assumed it was not the filter, so I assumed it would be the fuel pump. I went to the auto parts store and bought a pump, the guy at the store said I might want to try to check the relay and hosed for kinks before I drop the gas tank. The truck was now running ok, so I had to make it fail again. I started driving around trying to make it fail. It ran okay until I drove very aggresivly Then the same thing happened again. I lost power, and it eventually died and wouldn't restart for ~30-60min. This time however, the check engine light came on. Codes were P0131, P0137, P0151, P0157.... low voltage on all 4 O2 sensors? Now I'm really confused. Is this a fuel pump issue or is something in the O2 sensors feeding back that is causing the problem.

 

I also checked the fuel pressure regulator.... there was no fuel in the vacuum line...

 

I don't know if it is related but ~2 months ago I got a P0446 (I think that is the right code but it may have been P0440) Evaporative Emission vent system performance.

[xzz0195]

I have a k1500 Silverado 4.8L. I going up a mountain pass, and lost power. When I pushed the accelerator, nothing happened, my engine just slowly died. It restarted I got it to a gas station although very sluggishly. (gauges looked okay) When I tried to restart it it wouldn't start. The check engine light was NOT on. A friend of mine came to pick me up about an hour later, and asked me to start it see what happens. It started fine and I was able to drive home (downhill). I assumed a fuel issue. I just filled the gas tank and wasn't out of gas, It happened speratically so I assumed it was not the filter, so I assumed it would be the fuel pump. I went to the auto parts store and bought a pump, the guy at the store said I might want to try to check the relay and hosed for kinks before I drop the gas tank. The truck was now running ok, so I had to make it fail again. I started driving around trying to make it fail. It ran okay until I drove very aggresivly Then the same thing happened again. I lost power, and it eventually died and wouldn't restart for ~30-60min. This time however, the check engine light came on. Codes were P0131, P0137, P0151, P0157.... low voltage on all 4 O2 sensors? Now I'm really confused. Is this a fuel pump issue or is something in the O2 sensors feeding back that is causing the problem.

 

I also checked the fuel pressure regulator.... there was no fuel in the vacuum line...

 

I don't know if it is related but ~2 months ago I got a P0446 (I think that is the right code but it may have been P0440) Evaporative Emission vent system performance.

 

 

I'm not exper on this but I just changed my fuel pump, fuel pressure sensor and fuel filter because my truck would just die. Then restart, but die immediately after trying to go. I towed it back put on OBD2 meter, had no codes just like you. I asked questions here, and felt the same as you, it had to be either a fuel or ignition issue. The folks here guided me to the fuel issue, now that I have those new items in truck, it's running like a dream. Caution though if you start to replace your fuel pump.... Take the bed off to get to tank versus dropping it. When you drop the tank it's more difficult due to how everything is "up in there" and hard to see (getting fuel line connectors off, removing gas hoses etc.)

[xzz0195]

I have a k1500 Silverado 4.8L. I going up a mountain pass, and lost power. When I pushed the accelerator, nothing happened, my engine just slowly died. It restarted I got it to a gas station although very sluggishly. (gauges looked okay) When I tried to restart it it wouldn't start. The check engine light was NOT on. A friend of mine came to pick me up about an hour later, and asked me to start it see what happens. It started fine and I was able to drive home (downhill). I assumed a fuel issue. I just filled the gas tank and wasn't out of gas, It happened speratically so I assumed it was not the filter, so I assumed it would be the fuel pump. I went to the auto parts store and bought a pump, the guy at the store said I might want to try to check the relay and hosed for kinks before I drop the gas tank. The truck was now running ok, so I had to make it fail again. I started driving around trying to make it fail. It ran okay until I drove very aggresivly Then the same thing happened again. I lost power, and it eventually died and wouldn't restart for ~30-60min. This time however, the check engine light came on. Codes were P0131, P0137, P0151, P0157.... low voltage on all 4 O2 sensors? Now I'm really confused. Is this a fuel pump issue or is something in the O2 sensors feeding back that is causing the problem.

 

I also checked the fuel pressure regulator.... there was no fuel in the vacuum line...

 

I don't know if it is related but ~2 months ago I got a P0446 (I think that is the right code but it may have been P0440) Evaporative Emission vent system performance.

 

 

I'm not exper on this but I just changed my fuel pump, fuel pressure sensor and fuel filter because my truck would just die. Then restart, but die immediately after trying to go. I towed it back put on OBD2 meter, had no codes just like you. I asked questions here, and felt the same as you, it had to be either a fuel or ignition issue. The folks here guided me to the fuel issue, now that I have those new items in truck, it's running like a dream. Caution though if you start to replace your fuel pump.... Take the bed off to get to tank versus dropping it. When you drop the tank it's more difficult due to how everything is "up in there" and hard to see (getting fuel line connectors off, removing gas hoses etc.)

 

 

 

Woops, I had another stall issue while driving the past Saturday, need to look into this issue again....

[ColoradoSkiCountry]

Fuel Pumps and Fuel Pressure Regulator on the GMT-800s are not known to be very reliable. I'm willing to bed that you have a fuel pump on it's way out. It will not set a check engine code if the pump is going out. Assuming you have an in-line fuel filter as well, you will want to replace that. Other wise the fuel filter will be in the fuel pump module and replaced when you replace the pump.

 

I have a k1500 Silverado 4.8L. I going up a mountain pass, and lost power. When I pushed the accelerator, nothing happened, my engine just slowly died. It restarted I got it to a gas station although very sluggishly. (gauges looked okay) When I tried to restart it it wouldn't start. The check engine light was NOT on. A friend of mine came to pick me up about an hour later, and asked me to start it see what happens. It started fine and I was able to drive home (downhill). I assumed a fuel issue. I just filled the gas tank and wasn't out of gas, It happened speratically so I assumed it was not the filter, so I assumed it would be the fuel pump. I went to the auto parts store and bought a pump, the guy at the store said I might want to try to check the relay and hosed for kinks before I drop the gas tank. The truck was now running ok, so I had to make it fail again. I started driving around trying to make it fail. It ran okay until I drove very aggresivly Then the same thing happened again. I lost power, and it eventually died and wouldn't restart for ~30-60min. This time however, the check engine light came on. Codes were P0131, P0137, P0151, P0157.... low voltage on all 4 O2 sensors? Now I'm really confused. Is this a fuel pump issue or is something in the O2 sensors feeding back that is causing the problem.

 

I also checked the fuel pressure regulator.... there was no fuel in the vacuum line...

 

I don't know if it is related but ~2 months ago I got a P0446 (I think that is the right code but it may have been P0440) Evaporative Emission vent system performance.

 

 

I'm not exper on this but I just changed my fuel pump, fuel pressure sensor and fuel filter because my truck would just die. Then restart, but die immediately after trying to go. I towed it back put on OBD2 meter, had no codes just like you. I asked questions here, and felt the same as you, it had to be either a fuel or ignition issue. The folks here guided me to the fuel issue, now that I have those new items in truck, it's running like a dream. Caution though if you start to replace your fuel pump.... Take the bed off to get to tank versus dropping it. When you drop the tank it's more difficult due to how everything is "up in there" and hard to see (getting fuel line connectors off, removing gas hoses etc.)

 

 

 

Woops, I had another stall issue while driving the past Saturday, need to look into this issue again....

 

[minibike132]

Fuel Pumps and Fuel Pressure Regulator on the GMT-800s are not known to be very reliable. I'm willing to bed that you have a fuel pump on it's way out. It will not set a check engine code if the pump is going out. Assuming you have an in-line fuel filter as well, you will want to replace that. Other wise the fuel filter will be in the fuel pump module and replaced when you replace the pump.

 

This time however, the check engine light came on. Codes were P0131, P0137, P0151, P0157.... low voltage on all 4 O2 sensors? Now I'm really confused. Is this a fuel pump issue or is something in the O2 sensors feeding back that is causing the problem.

 

A fuel pump itself will not set a code saying "here I am, replace me" but most things really don't. It's about the symptom and the codes togeather. I would be chasing fuel issues. The O2's are telling you that you are running super lean. Why do we go lean, vacuum leaks and low fuel delivery. Since this happens on accel vaccum isn't going to be the issue because at wide open throttle the throttle body is one huge vacuum leak.

 

Fuel pump, filter, kinked lines etc. Anything that creates low fuel volume on both banks at the same time is a suspect. It is probably a pump though.