2007 chevrolet silverado. No fuel pressure
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- Опубликовано: 8 сен 2024
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In this video I explain how to ensure your fuel pump is not bad
**Want to own the tools I use ?? Click on the amazon link below to get my top 5 Tools I use**
Automotive Test Light- amzn.to/3z1Pdxa
Flexible Backprobe- amzn.to/3Pyr3zO
Multimeter- amzn.to/3PbuT23
OBD Scan Tool- amzn.to/3zaNWnq
Wire Piercing Probe- amzn.to/3OecWhT
I have been experiencing low fuel rail pressure in my 07 with the 4.8 as well. Same Vin Code C. I did already spring for the Fuel Pump replacement and that was a pain in the a$$ to replace! Going to check out this option next! I read another comment that mentioned Parts Geek the Dorman FPCM are now 123$ and come programmed for the specific year. Hopefully this is the answer. Nice video. Thank you
There are recalls on the driver control module(FSCM), also if you order from partsgeek they come pre-programmed and only cost $110...
Sweeeeeet thanks for the info
@Arthur which one did you purchase that already came pre-programmed? They got 3 different ones on their site. Thanks in advance
Replaced fuel pump last spring (due to pin holes in the lines) and got PO191 code within a month. Definitely gonna look into this!
Great video. Most modern Trucks have the FPCM. This knowledge can be applied to any vehicle that has the Fuel Pump Control Module. I will use your methodology to test the FPCM on my Land Rover. I will use the Launch to monitor and record the Fuel pressure to make the test easier. Testing the Fuel Rail Pressure Sensor is part of the diagnosis too. The Snap On Guided Component Test is a God send for Technicians.
Definitely wish I would’ve seen this video before replacing my fuel pump! Just learned about the control module and seems to be my problem
Thanks bro u just save me some money fix my truck thanks to ur video
It’s The thick grey wire if anyone needs to know
Good shit my 2007 chevy tahoe i believe thats happening to it. Gonna check the module first and see if thats the fix. Thank you keep up the good work.
Nice job! Cant beat the Power Probe.
Just to add some info. 1. If you replace the fuel system control module, (FSCM), it will need to be programmed to your vehicle, aaarrgghh!.... dealer 2. The FSCM connector/plug has a rubber seal in the connector, if that seal gets pushed down into the FSCM, it will not make electrical contact and the vehicle will still not start, even though the pump and the module are perfectly fine.
lleach64 that is correct as well. Luckily I have the program and tool to reprogram it
Thanx for the video im at the same point with an 08 Avalanche. Will test in the morning I think it is the FSCM will my otc genysis evo 5.0 updated to 2016 do the reprogram
Thank you, I watched your video but I have a question about what pressure should also be applied when performing the BYPASS on the fscm connector.
Salutations Mr. Oz have a question 4 u , I have a 2003 silverado ls extended cab with a 5.3 v8 and i looked in the rear by the spare tire where they say this fuel pump control module suppose to be and nothing i looked everywhere and can.t find this module Or is it that my particular truck does not have one ????
Good job bro. It helps when you know how things work.
sorry, what was the problem now? Was the fuel pump relay' broken ?
The fuel pump was only working when you put it direktly on 12 V. ?!
thx
Bro! Thanks! I will do this test in the morning. I suspect the pump but I never considered this could be the case. Mine has a 5.3. Is your pressure meter attached to the fuel rail? Or somewhere else? The output pressure from the pump should be the same as the rail?
Thanks again
Cheers from Louisiana.
Hey brother how do i add 12v to it
Thank you...........JB...............
I have the same year. My Fuel psi fluctuates, at start up a good 60 psi after a few minutes the fuel psi drops down to 40 psi so low it creates misfires and shuts off then shoots back up a little later to 60psi. I know on these models the regulator is built in with the pump. You ever experience this? Thank you
The pressure regulating is all done in software in the FPCM. There is no regulator anymore.
How did you get the twelve votes to it to check it and when I change it do I have to get it reprogram please help
Where is the Modular located? Also, Have you experienced fuel leaking into your exhaust? I pulled out the spark plugs on #4 and #6. I smelled fuel on the spark plus there was fuel coming out of my header on the passenger side. I welcome all suggestions.
Stuck or leaking injector on those plugs
Also check if there is actual spark as to why the fuel isn’t being burned. Check coils aswell
@@andrersnandez8568 I have an external corvette pump and filter. But had it running fuel back to the fuel tank. But with this setup, I don't need to run a fuel line back to the tank. So there was too much fuel in the line and it spilled over into the combustion chambers through the injectors.
great vid,great info,but did not show you locate module.? thanks
Lynce Cullins they very in locations. This one was located under the spare tire
I have a 07 Sierra classic 4.8. Put a new fuel pump in it last week. Worked great for 3 days. Went to start it yesterday and no start. Relays and fuses are good. I can hear the fuel pump turning on and priming but zero fuel pressure. Half tank of gas. Don’t see a module under the truck. Any ideas
Did you change out the whole module assembly or did you just replace the fuel pump out of the module ?
I changed the entire assembly
Yesterday I did a quick check and sprayed starting fluid down the throttle body just to see if it was spark related and it started but died. Grabbed a fuel pressure gauge today and checked at the motor and it’s zero
Check the fuel filter
Why didnt you show the location of the fuel pump control module?
Dear Oz mechanics, I have a 2008 GMC Sierra 4.8L. I have new fuel pump, new control module, new temperature coolant sensor. The truck turns over and I have a spark. I can hear the fuel pump buzz, but No fuel. What could it be?
Did you ever figure out what it was?
@@Texelectric yes, I bought a brand sending unit that was not compatible with the ECM. Stay with original brand sending unit, AC Delco.
Looking for advice changed my fuel pump on my 2007 Chevy Silverado 1500 5.3 engine and still didn’t work now I replaced the control module and now the computer say (fuel pump command off) does anyone know what that might be
The control module has to be programmed
FIRST, Call around for a shop that subscribes to ACDelcoTDS. Avoid Dealership Service (infamous for shaking customers down). Without that tool, you cannot program any GM module.
Also, check the grounds on the frame. You would not believe the mischief a bad ground can cause.
great video Oz
I am have this trouble with a 2003 tahoe, My gage shows 40 psi and drops off to 0. Then it will not start, And get this the info on the dash says DIE LOLO one more piece of info is my scanner is telling me pressure circuit is open., Any thoughts on this?
Great video! I have an 07 Silverado too with similar problems but I cannot find the control module. The dealer says that VIN number doesn't show to have one, is it possible that my truck doesn't have one?
It is possible that the year truck still has a fuel pump regulator under the hood.
Good info, video, great job...
Righty Tighty thank you for watching
Im going through this issue right now, but im only having an issue when the vehicle is hot (at operating temperature) so I changed the FP it was 15 years old. The problem still occurs! Does this sound like the module could be losing power? Once the truck cools down Fuel pressures are fine and starts right up.
I’m having this same exact issue with my 2007 Silverado with the 5.3 did you ever figure it out???
Great video, is there a way you can show where the fuel pump is located at? I was looking on it truck but all I say was a black box next to the fast tank. Thanks I have a 07 Chevy Silverado
The fuel pump control module on this Silverado’s are located where the spare tire is at. Just make sure to test to make sure that’s the issue
The FUEL PUMP is INSIDE the tank...same place the fuel float is.
The fuel pump is designed with the sending unit that goes directly in the tank. I replaced my fuel pump module this summer. The module replaces the fuel pressure regulator and it looks like a music CD case that is bolted under the frame. You have to remove your spare tire under the truck to easily get to it.
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mine reads 0 but starts up then shows like 44 psi
Black tibby07 I get it😏
Was your fuel pump still turning on?
What if it will crank and the fuel pump is working but still want start?
It can be a lot of things. Proper diagnosis would be needed. Do you have proper fuel pressure, good spark, any codes ?
Fuck , yesterday I pulled the bed out of my truck and change the fuel pump. It didn't work, till I watch this video
nice vid thank you
thank you for watching
Keep doing videos
Hey bro so i had the same issue wit my 07 avalanche but i made the mistake of not doin enough research of locating the fpsm now after i installed the new fuel pump still have the same issue but now i cant find the fpsm am i missing something also most of the videos on here wit avalanches there fuel pumps only have two top hoses on there pump mines have 3 any help would be appreciated thanks
The fuel pump module is located right above the spare tire. You have to lower the spare tire to the ground to see it. It looks like square CD case with a wire harness plug into it.
@@kv.g3737 yea so i looked and nothin and called my dealer and they checked my vin and my truck doesn’t come wit it for some reason checked my fuses and relays and everything ok also replace throttle sensor any help would be appreciated
I changed the fuel pump, fuel module, an the fuel injectors the truck start and drive but lose pressure in the fuel over 3k rpm it drops to 20psi ... I just rebuild the motor (6.0) still have the same problem any help
The proper way to check now it to see what the module is doing. What signal is being sent out. As well check out the amp coming from the fuel pump to verify if there’s any restrictions
@@OzMechanics I'll check it out thank you
The same thing happened too me in like a Silverado 98 the truck broke down and the fuel pump got replaced and it worked and A few weeks passed without using it and tried starting it and the fuel pump sounded weak and it only starts if u put starting fueled in it but turns right back off
Spark fuel and compression
Hey' thats what I do when my truck won't start ' I flip it the bird' ha"(LOL)
was the wire going straight to the pump black and white?
brotherzkeeperz the one I fed voltage goes straight to the fuel pump
How to look the mayo
Where is the electronic fuel module located under the hood
The fuel system control module is located under the center of the bed, just above the spare tire. A really stupid place to put such a critical component.
lleach64 yea but for the dealership the more they make bad parts the more money they make. It's all money game
I have a 07 Chevy Silverado with a 4.8 in it. I have a crank no start. I've taken the bed off and tested the fuel pump with a battery on the positive and negative prongs on the pump and the pump runs. I have swap the fuel pump relay and fuse but when I check the fuse it's not getting any power to it but the relay has power. However, if I jump the 30 and 87 on the relay I get power to the fuse. I then went to the gray wire to the fuel pump and with a helper turn the key on engine off and test the wire and there is no power at the gray wire for the 2 seconds that it suppose to supply power. What else can I check? If I knew what color the fuel pump fuse wire was I can trace it.
Finalboss 84 let me get a wiring diagram for you so you can use
Oz Mechanics thank you so much. I've been at it for two weekends now
send me your number
Oz Mechanics thank you. It's the fuel pump control module
@@OzMechanics can you post a diagram
can anyone tell me where the fuel pump control module is located in a 2013 Chevy Cruz?
www.repairprocedures.com/service-manual/document/2012/chevrolet/cruze/engine/fuel-pump-flow-control-module-replacement/3605_2817_5451_84481_8_2477636.html
if you do put a new one it would have to reprogrammed or the vehicle will not turn on
Remove your spare tire and you will find a music CD box that is bolted under the box frame. Disconnect the harness and remove the three bolts. I paid $130.00 for mine this summer. It helps if you have small hands.
And where do i reprogram the module at?
Dealer, or buy the $1,200 computer system (J2534-1 interface tool). DGTech has a decent unit, the VSI-2534, at a good price. The little $50 'over-the-counter' readers are just that, readers...not programmers.
Wheres the relay
español
Hey Oz I've got a 2010 silverado, it has 18 psi key on engine off, after initial prime, psi goes to 0 immediately. It takes a couple cranks to start the truck. And the truck runs at 18 psi. It sets several lean codes. And runs rough. I tested fpcm, pink ignition feed and it was 14.2v running, red with white tracer B+ was also 14.2 running. Then i tested the thick grey wire that is positive to fuel pump. Truck running and idling it was fluctuating between 11.4 and 11.9v. The pink ground to fuel pump was .20mv. Now here is where I'm confused, the battery voltage was 14.2 running. The power feed from fpcm to fuel pump was between 11.4 and 11.9v i know the pump is bad because the check valve is not holding pressure, key off pressure drops to 0 immediately. Was the grey wire power feed to fuel pump supposed to be battery voltage 14.2 or was the 11.4, 11.9 good? My understanding, and i may be wrong is the regulator is built into the pump and the pump is pulse width modulated to increase pump speed to build more pressure or less pressure depending on fuel rail pressure sensor and fuel demand. I called the pump on this truck but I'm questioning myself on the fpcm. Any help would be much appreciated. I'm very green at diagnostics and want an experienced opinion. Because if the 11.4 and 11.9 were supposed to be battery voltage then this truck will need a fpcm also. Thank you in advance for any help!
You are pretty much spot on with everything. Have you looked at your data pids to see what you fuel pressure sensor is reading ? And how much pressure the pcm is commanding to the fpcm? If they all read good get a jumpered fuse and put b+ to the fuel pump and see if the pressure increases. If it does your problem is the module. Make sure to get it reprogrammed afterwards
@@OzMechanics I'll have to recheck my data pids. When i supply battery voltage which was 14.2v to fuel pump with power probe should i have the connector unplugged? That was my fear in sending the battery voltage to the pump. Being plugged into the fpcm i wasn't sure if i could do any internal damage to the fuel pump control module doing that. Because the connector was plugged into the fpcm and i was doing all testing through piercing probe and i used liquid electrical tape to seal up where i punctured wires to do the tests.
buggy1971 you can unplug it. Add voltage to the power side and hook up the ground to the ground side of the fuel pump
I need help my SILVERADO won’t start my fuel pump won’t kick on I don’t if is the fuel pump or the fuel control module
The only way to figure it out is to test the vehicle. Try what I did in the video to verify what’s going on
Pp