'18 Chevy Silverado - Engine Light On - EVAP Leak & Problem With Fuel Pressure Sensor

all right folks brought us in this 2018 Chevrolet Silverado the money lights on I hope that went and ate some lunch now it's time to come look at it 41. 667 on the clock in this little fella I wonder if it's cylinder warranty 2018 I don't know let's uh check here real quick we'll do a little system scan on it Let It Auto ID here on the altel we'll see what codes it throws we'll go from there Chevrolet's they scan pretty quick all right let's go to the report oh three coats on there huh fuel a pressure sensor performance and let me grab a planning apparatus here so we've got a p018 Bravo and that is a mill requested current code so fuel pressure sensor performance interesting uh your classic small evap leak wouldn't be a GM without one of those that is a current code and fuel pump flow performance it's also current what's up Miss though do you need me we are brass huh you walked over here oh yeah walking to my world uh I see 26.35 fuel pump performance so that's pretty interesting um let's see here did you need me there oh girl I asked him for a hug oh you did why don't we put the camera down are you such a good hugger so let's just see something here folks before we get too deep in this um fuel pressure sensor I don't know if that's talking about that's gonna be GDI okay so this is gonna have two fuel pressure sensors on it at least low pressure system and high pressure so let's go into live date I just take a little peaky Peak you know one of these data groups fuel system probably we should have some fuel pressure it's the one that says PSI okay here we go so fuel pressure desired desired rail and then we should have our high pressure we do now one and two I don't know what the difference is okay so we have our high pressure fuel pump which adds the vehicle sits here stationary if the engine was warm you would see this slowly and continually rise but this engine is cool we just I just brought it before lunch and parked it and it sat in the parking lot all day um I'm surprised we don't see any low fuel pressure um tell you what let's just go ahead for Grins and Giggles let's start this little guy up that way we can see if that maybe it's just all bled back in the tank [Music] I think see the money light is on there well would you look at that all right desired on the low side is 72 but it's showing zero our high pressure fuel pump obviously seems to be working all right the sensor must just be shorted out 0.4 volts I think they're underneath the car that's interesting fuel rail temperature minus 40. I don't know what that's about all right well I tell you what before we get too excited I think the low pressure sensor I think it's underneath the vehicle which around here we get a lot of rodents and stuff eating things I would think it would be at 5 volts so if it was open circuited so let's just have a little game drip there there she is so that's our fuel pressure sensor let's get that um voltage pit there we go we don't really care about the high pressure anymore like I said I would have thought looking for rodent chewed it it would be open circuited oh okay so open circuit is zero volts on this one okay or okay let me get a tripod and we'll just do some basic checks so this should just be you know five more uh ground and our signal wire got my multimeter here we're just gonna flip a ground right there on our abs which is that gonna be good apparently I took dollars I had to be good enough for reading with the meter let's see we're gonna take I'll do the poking hope here let's see I've got a brown wire here on the left that reads 4.99 our middle wire is black with something maybe black with yellow Maybe 2.3 millivolts and then the last player here seven millivolts so one of the one of those wires is our round one is our signal let's um let's do this let me go grab a test light still got our scan tool pulled up here I'm going to take a low current test light here 100 milliamps let's stick this in our 5 volt side see if that'll hold there nicely for us oops and it won't just going to grab another t-pin here out of the old hat okay let's try this again I've got that clicked onto our five bolts take this t-pin here if we hit the ground we might get a dim light if we hit our signal wire we're going to get 5 volts so there we have a dim light so there's our ground probe into the one out here our scan tool goes to 5 volts so that tells us wire integrity it's perfect let me show you so you see how that went up there momentarily five volts so that's good that tells us the computer is good the wiring to the computer is good and everything is good what it tells us though is we either have no fuel pressure which I doubt because the guy drove it here or we have a bad fuel pressure sensor which is more likely the case uh that does not fix our evap leak that should fix uh two of the problems um what were those codes there we'll go back here and look at those again it's going to fix the p018 Bravo fuel pressure sensor performance oh now we got all kinds of codes we have it unplugged and then what did we have we had one eight four four two and the 2635 code the p2635 fuel pump performance flow fuel pump flow performance that would also be generated with a fuel pressure sensor issue let me um before we get more involved perhaps this truck's fun or warranty eight twenty Eighteen with less than 50k on it let me just call real quick because I had to call Chevrolet anyways to see if they have a fuel pressure sensor for it and then I'll find out from the service department at the six cylinder warranty if I give you a VIN can you see if the car is still under warranty for me yeah but it's a Juliet Zulu 365-760 less than 50. the fuel pressure sensor has gone bad on it I didn't want to do anything if it was under warranty still all right so it still has power train until November so now I got to run the app code to see if it's something that's covered so if you want to hold a couple minutes out I said it actually has two problems with it it's got a code for an EVAP leak which I haven't checked yet and then the fuel uh fuel rail pressure sensor has gone bad on it that I did look that's got a failed sensor oh okay so that won't be covered that that's not under powertrain nope okay I just want to double check yeah sure the yeah on the on the low uh pressure side of it the one underneath the vehicle yep [Music] thank you okay so I know that is not covered under powertrain either oh okay um can you send me over to Parts yeah yeah cool thanks okay good news and bad news good news is uh they have one of these in stock at the Chevy garage and the bad news is truck's not under warranty guy told me nothing on emissions which I thought they were eight year eighty thousand yeah which he said ran out just a while ago so yeah whatever um which I think I only covers computer and converter anyways I don't know whatever it's not under warranty tells me uh the good news is they have that in stock so let's take and pop this little guy off let's make sure it actually has fuel pressure IRL in real life which I'm sure it does oh 16 mm look at that here oh well that comes off nice and easy I didn't depressurize it so oh fuel is squirting out of there at a high rate of speed more than one PSI so that's all we need to do I'm not going any further a fair amount of pressure on that as you can see it into their ended up you know what I mean okay let's uh grab the Avoca smoker and see if we can figure out where the EVAP leak is but before we do that let's just move down here one step let's go to active test let's make sure we hear our vent valve working uh let's see if we can go to evaporative emissions we're going to go to vent valve we're going to turn it on ready back off okay so it turns on and off and the next thing we'll look at is we'll make it not vent and we'll go to fuel tank pressure which is 1.51 volts currently and theoretically with that closed and volatile fuel in the tank we should see a rise in pressure just naturally but we just saw a little Decay but it's not building pressure so that tells me that there really is a leak for Rizzle and uh providing that our vent valve is actually closing we hear it clicking doesn't mean it's working so so that's all we can do under here so let's set it down and get the smoker oh she's one of these jobbies interesting okay I never I haven't messed with one of these yet done them on Fords I don't know if this is the only ceiling surface but that's kind of interesting okay at least we know it's capless I jumped on the Identifix looking for a silver bullet there is none 2018 Silverado's uh 442 um just your standard uh service info but nobody posted any fixes and the reason I was looking is to see if the uh you know capless system was Troublesome on these I had nothing I've run across but I figure if there's you know 9 million hits well we know where to look now we have to do it the old-fashioned way whoa that's springy actually figuring out what's really wrong with it well I suppose that's all we get paid to do right um let's switch down here let's see if we can't get this little fella unplugged so there's our little deal we need to get to we're gonna use this fella this is from Redline a little adapter kit [Music] [Applause] which size do we need a small one is that thing at 3 8 by 16. click click that in that way we can hook up the smoker zipper purse back up stick it in there bring over the Avoca smoker what we're going to do is we're going to fill the whole system full of smoke at full speed I like to let it go until I see a lot of smoke ripping out of the rear end because that way there we know the system's full then we seal it off and if there is a leak we can we're a little more hopeful we have a little better odds anyways so we can see even with the vent valve open our pressure has changed okay so like I said Let It Go for a little bit until we see some smoke crawling here oh I see some smoke you guys see the smoke all right so we got some good smoke back there and let's go not venting we should see it rapid rise in pressure which we do let's kick off this vehicle let me just kick that off see if we have a decrease in pressure oh we do she's dropping like a rock okay so we have a leak for real not that I doubted it but let's let her uh get small Builder up to full pressure and then we'll see if we can find out where it's leaking from maybe it'll be easy oh must be this isn't what SEALs it okay so it must be like four this is just your dirt trap door that that stops the big chunks from going down in there then there's another ceiling apparatus down below must be they do it better than the Ford ones we fix I haven't ran across one of each other I have to say that it can't go wrong but these Chevys yeah she's still flowing quite a bit how much uh petrol is in this thing where's she at there okay good she just about empty that's good when you're doing smoke tests I was gonna say I need Chevys we always find them I don't know if they've changed with this body style but usually the fuel pumps are rotted out of them all right well let's go up in the air she's at full pressure gets down to 0.3 volts as low as she goes and uh see if we can find a leak here folks I can hear it oh I hear it up there can you guys see up there let's see can you fit I don't know what you guys can see I see smoke that's coming from up there someplace we get a mirror we just your standard rotted out Chevrolet these things are no cracker boxes they don't last very long like this is a 2018 only have three or four more years left and it should be in the crusher thank you hope I'm not giving anybody vertigo a mirror That's a classic plastic fuel pump oh there it is yeah okay so I see the wet spot then get out the flower let's see uh um where you at Philly I don't know if you guys will be able to see it see the wet spotter on the uh metal ring there right next to that fitting see we're dry dry wet and hands so it's where she's hissing from so the wet spots the oil from the smoke so yeah I'm gonna need a fuel pump not a big deal so what happens these fuel pumps are plastic tanks plastic so GM was like super close to getting it right but then they put the metal lock ring on it and then you add a bunch of salt and water and stuff like that when that lock ring swells up and then usually breaks the tabs off the tank and then ultimately usually before that the first fuel pump what it will do is it'll crack the plastic so all around the plastic top of the pump when we take it out of there you'll find that it'll be fractured all the way around and then you know hissing so I guess that's what this truck needs it needs a fuel pump even though it's still pumping and it needs a pressure sensor so that's it let me see if the fella wants to fix it I'll see if Chevy has them in stock the good news is that uh GM has switched them to the plastic sending unit so the lines will come up because it used to be when they were metal let's say like the 07 to whatever 15 style I don't know if the body style changes but in that area like the 10s 11s 12s 13s you know right up through they were metal and then you couldn't get lines unhooked and those lines are like 100 and some bucks whack you needed all three of them so I added like you know 300 and some dollars to the bill because you just couldn't get them undone without you know ripping the guts out of them so let me see if Chevy has the parts the fuel pump they probably do and then most importantly see if customer wants to fix it and then we'll go from there well today's this guy's lucky day the Chevy garage has a fuel pump module in stock with the locker in which we also need and they have the pressure sensor which you guys already knew about uh they do not have a fuel level sensor though so when you buy the pumps from General Motors they sell two different module kits with and without the level sensor the one with the level sensor is on uh forever back order unprecedented circumstances covered 19. uh fill in the blank supply chain issues you know the story they give you uh so there's that so they have one without and we have to be super careful because they do not have a fuel level sensor either and they're on an infinite forever back order unprecedented you know you know the story we've heard a thousand times already foreign [Music]

Channel: South Main Auto Repair LLC

Views: 172,263

Keywords: fuel tank pressure sensor, silverado high pressure fuel pump, chevy high pressure fuel pump replacement, 5.3l high pressure fuel pump, high pressure fuel pump replacement, how to replace silverado high pressure fuel pump, fuel pump problem, bad fuel rail pressure sensor, fuel rail pressure sensor, fuel pressure, how to replace fuel tank pressure sensor chevy tahoe, how to install fuel tank pressure sensor chevy tahoe, fuel pressure sensor, low fuel pressure

Id: px1coh-Qhlc

Length: 20min 11sec (1211 seconds)

Published: Sat Jul 15 2023