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 > Your search for posts made by 'Thunderbolt' found 27 matches.

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RE: Truck not getting fuel

Thanks for everyone's input. Huge relief that I was able to figure it out.
Thunderbolt 10/09/21 12:03pm Tow Vehicles
RE: Truck not getting fuel

New UPDATE. I found the problem ! Truck did not start when I got home so I pulled the harness connector that goes to the coil packs on the drivers side. I hooked a test light to the positive side of the battery and tested the ground in the connector and the light was dim so I jiggled the ground wire near the power steering pump and the light was bright. Truck started right up and while it was running I jiggled the wire and the truck died. I confirmed it several times. I could move the wire and it would start and if I moved it again it would die. Bottom line is it is a partially broken ground wire.
Thunderbolt 10/08/21 05:06pm Tow Vehicles
RE: Truck not getting fuel

Camshaft position sensor. Both camshaft and crankshaft sensor should throw a code. I am still thinking oil pressure sending unit. When first turning key on pump is powered for 10-15 seconds through the fuel pump relay. Then if oil pressure is present power to the pump is through oil pressure sending unit. I am no longer having fuel issues though. The fuel pump is working and I have fuel pressure, but now I have intermittent no spark. I have been reading about bad grounds for the coil packs that are supposed to be a common issue. The trouble is that now the truck starts fine, but I won't drive it this way. Would the oil pressure switch affect spark ?
Thunderbolt 10/08/21 06:25am Tow Vehicles
RE: Truck not getting fuel

Would a crankshaft position sensor cause this even if the check engine light is not on ?
Thunderbolt 10/07/21 04:08pm Tow Vehicles
RE: Truck not getting fuel

UPDATE. I thought I had this truck fixed and the fuel issue is, however it died again ! Fuel pressure is good so I went to check spark. I unplugged a wire and put a spark plug in the wire so I could check. I held it to the exhaust manifold and had my wife cranking it over. At first there was no spark and then there were a couple sparks and the truck started and has been running for half an hour. I wish it would not have started ! I am now thinking I have a ground issue for the coils, but unsure and I will not drive this until I know I found a problem. Any suggestions ? I don't like giving up, but am at the point of having a shop look at it, but how are they going to diagnose it when it actually runs at the time ? I put 300 miles on since replacing the pump and not one issue until today.
Thunderbolt 10/07/21 04:04pm Tow Vehicles
RE: Truck not getting fuel

The fuel pump is the only thing on my 6.0 that has left me on the side of the road. It died at 195k 6 miles from the campsite. It's now at 256k, and still going strong. The only thing that left me stranded besides the fuel pump was the transmission and that was likely my fault. I have a Nelson Performance PCM in the truck with shift points raised and firmed up as well as the engine tuning. I went to go around a semi near my house that was barley moving and I let the truck shift from 1st to 2nd gear at WOT and it happened. I heard a loud bang and then nothing. I had no forward gears or reverse and the truck acted like it was in neutral. I thought the input shaft broke, but it stripped all the splines out of the forward drum.
Thunderbolt 09/29/21 07:43am Tow Vehicles
RE: Truck not getting fuel

Have you thought about a bad fuel pressure regulator? It is all fixed now, but yes I had thought about the regulator and pulled the fuel line off leading to it and still did not get fuel. That is when I realized the pump wasn't even running.
Thunderbolt 09/28/21 08:06am Tow Vehicles
RE: Truck not getting fuel

^Smart move. Empty tank = mucho easier. So interesting. Bad pump, replaced with new, new pump sun standard and short in the connector on the pump side? While a bit unusual, not unheard of. I’ve had more poor quality with out of the box new parts in recent years than I recall ever back in the day… To the point that I generally start with diagnosing if the new part is the problem since it has been on multiple occasions. (Not just fuel pumps) I have one of those suspect fuel pumps in our boat. Boat runs a common GM in tank fuel pump for efi engines. Replaced a couple years ago when the original one died. New one fixed that issue, but it does not sound as good as the original and 2 out of 3 tries it won’t fire the engine on the first attempt, even waiting for priming to stop before cranking it over. And it always cranks longer than it should, to start. It makes proper pressure, even under full throttle, tested that as I’d prefer not to replace it unnecessarily. But it is not a good pump. Being a boat, it has had less than 100 hours of run time since replacement. But my suspicions were confirmed completely last week after being on a buddys boat with the same engine and same exact replacement pump. (His boat has far more hours and his “new” pump has lasted hundreds of hours now and it sounds healthier than the poor quality one I have. Thus when mine died I bought the same brand /model pump he did because he already had years of operation on the new pump with no issue ) Mine sounds like an electric motor spinning a small rock tumbler by comparison… It wasn't actually the pump itself that was bad. It was the internal terminals on the plastic pump module that the pump wires plug into. I made the mistake of just replacing the pump itself and not the whole unit. Upon closer inspection I could see corrosion and could tell they had been hot.
Thunderbolt 09/28/21 08:04am Tow Vehicles
RE: Door Switch?

My wife's 2019 Equinox did that and the dealer had to reflash the computer. Hasn't done it since then.
Thunderbolt 09/23/21 02:33pm Tow Vehicles
RE: Truck not getting fuel

Let us know how it turns out! (And think how much quicker it'll go the second time around!) I put a new AC Delco assembly in with a new connector and as soon as I touched the key it fired right up. That other pump took some cranking before it started which concerned me, but I let it go since it started. I do believe that was another mistake on my part. Going to order new fuel lines because I can't get the filter off due to rust. Wow are they pricey though ! $400.00. I disconnected the fuel line and hooked a hose to the pump and was able to use the pump to drain all the gas before lowering the tank.
Thunderbolt 09/23/21 02:10pm Tow Vehicles
RE: Truck not getting fuel

Let us know how it turns out! (And think how much quicker it'll go the second time around!) I put a new AC Delco assembly in with a new connector and as soon as I touched the key it fired right up. That other pump took some cranking before it started which concerned me, but I let it go since it started. I do believe that was another mistake on my part. Going to order new fuel lines because I can't get the filter off due to rust. Wow are they pricey though ! $400.00.
Thunderbolt 09/23/21 02:06pm Tow Vehicles
RE: Truck not getting fuel

Thanks for the input everyone. I do believe I will be putting a whole pump assembly in the truck. I wish I would have just did that last week instead of just replacing the pump. I only did that because I had the pump already, but a lesson has been learned.
Thunderbolt 09/22/21 05:39am Tow Vehicles
RE: Truck not getting fuel

Many Chevs have the power for the fuel pump going through the oil pressure sending unit. Initial voltage is through the fuel pump relay, after cranking sufficient oil pressure is present to close contacts in oil pressure sending unit. I thought about that as well, but I tested the connector that plugs into the pump when it failed to start and had power and ground.
Thunderbolt 09/22/21 05:36am Tow Vehicles
RE: Truck not getting fuel

When it “doesn’t work” is the pump not running or can you hear it but it’s not pulling fuel? If the latter then probably not wiring but again, pumps usually aren’t intermittent. Pump does not run at all when the truck quits. It has to be the connector on the pump because if I unplug it and plug it back in the the runs. I tried it this morning after sitting all night and it fired right up.
Thunderbolt 09/22/21 05:35am Tow Vehicles
RE: Truck not getting fuel

Change the fuel filter Sounds like it is partially plugged and going to fully plugged soon. It WILL kill your fuel pump over time, if not already close to failing A good rule of thumb of mine is to change my fuel filter at about 1,000 gallons of fuel Edit…of course for a gasser Ben, I know the fuel filter needs to be replaced, but that is not causing my issue. If it was the filter I could let it sit after stalling and then it may start. My issue is that it stalled I check voltage to pump which is good then plug it in and it runs. Next time it stalled within one minute of it stalling my wife cranks the truck over while I disconnect the pump and when I plug it back it the truck starts and runs. The filter will be replaced, but do those symptoms not point the the fuel pump module connector ?
Thunderbolt 09/21/21 05:49pm Tow Vehicles
RE: Truck not getting fuel

(UPDATE) I have the connector disconnected from the pump. I tested the ground at the connector and it is good. I had my wife sit in the truck and I connected a voltmeter between the ground and pump power wire. I had her turn the key to on and had 12 volts. I then had her crank the engine and I had 12 volts. Is it safe to assume that it is the fuel pump assembly or am I missing something ? (New Update) I plugged the connector back in and the truck started and then died which is what Passlock does. I then had my wife crank the engine and I unplugged the pump while it was cranking and plugged it back in. The truck fired right up and is still running.
Thunderbolt 09/21/21 03:32pm Tow Vehicles
RE: Truck not getting fuel

(UPDATE) I have the connector disconnected from the pump. I tested the ground at the connector and it is good. I had my wife sit in the truck and I connected a voltmeter between the ground and pump power wire. I had her turn the key to on and had 12 volts. I then had her crank the engine and I had 12 volts. Is it safe to assume that it is the fuel pump assembly or am I missing something ?
Thunderbolt 09/21/21 03:18pm Tow Vehicles
RE: Truck not getting fuel

Have you checked the plug for a solid connection? It could be the engine vibrations are knocking it loose. I had a datsun with a fuel pump that intermittently stopped working. It would die while I was driving down the road and would be working when the mechanic checked it out (of course). Have you checked the fuel filters? I have checked the plug for a good connection. It could use a new filter, but I don't think a filter would just instantly stall the vehicle unplug and the drive fine for 200 miles and stop dead again. I have a new filter, but the line is rusted in and out of the filter so I can't get it off. I will be replacing them soon. I was able to unplug the connector without lowering the tank however I cannot check for power yet. Some dummy (me) left the key on and drained the battery. Now I have to wait until it is charged. If everything checks out at the plug then would it be safe to assume that I should install a whole new pump assembly ?
Thunderbolt 09/21/21 01:14pm Tow Vehicles
Truck not getting fuel

My 03 Silverado 2500HD 6.0 liter is having fuel issues and I am looking for some input before towing it to a shop. I was driving home from the lake with boat in tow a week ago and the truck coughed and died in the middle of an intersection. It was not getting fuel and had it towed home. I had a new pump at home so I put it in. This was just the pump and not the whole module. The truck still did not start right away, but eventually did and ran fine so I drove it all week without issue. On Saturday I was 100 miles from home and it happened again. No security light on and I tried swapping the relay and that was a no go so it was towed the 100 miles home. I have been doing some reading about the connectors on the original fuel pump housing failing or causing issues so I am thinking that could be the issue. Before I put a whole new assembly in I thought I would reach out and see if anyone has any ideas. Would a failing plug randomly quit working ? I know unplugging it and plugging it back in could possibly be why the truck ran after the new pump. I have also not ruled out the Passlock security even though the security light is not on. I have tried the passlock relearn procedure several times with no luck. My plan is to lower the tank enough to get at the connector and see if power is getting to the pump. Any other suggestions before I have a shop fix it ? Sorry so long winded, but I wanted to give as much detail as possible.
Thunderbolt 09/21/21 10:24am Tow Vehicles
RE: Why do I keep blowing out tires on my truck?

I think I know why we haven't heard from the OP. Most likely the online bickering back and forth. :)
Thunderbolt 08/03/21 02:37pm Tow Vehicles
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