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Hard Start after fueling

RyanbabZ71
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RyanbabZ71 Senior Enthusiast

RyanbabZ71

Posted
Posted

Well I developed an issue this past Wednesday. After filling up the truck she I went to start it up it wouldn't. Acted like it was starting. All the dash lights came on. After a few mins/tries it started. Has happened 3 straight times now. Every time after it has started fine. Here is a video. Also if I give it gas (which i did in the video) it will start faster

 

Thoughts? I did replace a few of the Evap system parts due to some codes. No codes with this issue

 

https://youtu.be/AtmwZzb-tzM

 

 

Ryan B.

diyer2 Senior Enthusiast

diyer2

Posted
Posted

I think you have a sensor that is going bad. TPS maybe being it starts faster when throttle is pushed. Fuel pressure? :happysad:

Dnt Senior Enthusiast

Dnt

Posted
Posted

Can you hear the pump run if you just turn the key to the on position without cranking the engine? You will need to be in a very quiet environment to hear it. If your fuel pump is going out sometimes multiple key try's will cause it to work for a few times (VERY FEW) Better go check this right now!

scott19677 Senior Enthusiast

scott19677

Posted
Posted

I know what your doing. This is all part of your plan to talk the wife into letting you order a 2018 model. lol So, this only happens when you run the tank low and then fill up? Do you fill it up to where it won't hold another drop? What about trying to run it empty and then put only 20 bucks worth in it? The reason I ask is my old body style 2007 did something similar to this and I could never completely fill up the tank, always had to stop a little short. Never did find out what it was before I traded for the new 2007's when they came out.

Silverado4x4 Senior Enthusiast

Silverado4x4

Posted
Posted (edited)

From the video there was a "low battery" message on the dic and after you started the volt meter came up very slow, could be the battery because cycling the key kinda zaps the battery (wakes up) and giving you enough power to start.

 

Now that I listened to the video again I did hear the motor turning over which again cycling the key will let the fuel pump build pressure, sounds like your fuel pump is on the way out.

Edited by Silverado4x4
RyanbabZ71 Senior Enthusiast

RyanbabZ71

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  • Author
Posted (edited)

I know what your doing. This is all part of your plan to talk the wife into letting you order a 2018 model. lol So, this only happens when you run the tank low and then fill up? Do you fill it up to where it won't hold another drop? What about trying to run it empty and then put only 20 bucks worth in it? The reason I ask is my old body style 2007 did something similar to this and I could never completely fill up the tank, always had to stop a little short. Never did find out what it was before I traded for the new 2007's when they came out.

 

She was in the truck the second time it happened and her words "maybe you do need a new truck" lol

 

It has happened at various levels. The first time I only put in about 6-7 gallons (filling up before we left this weekend). The second fillup was .5-3/4 of a tank. The last fillup was 21 gallons.

 

The battery is just about a year old. Truck turns over fine. If it was the fuel pump going bad I could see this happening every time. What I have read is it is due to the evap system issues?

 

Earlier this year I replaced the evap emission vent valve solenoid (code 0449) and the vapor canister purge valve (0442 and 0445 codes)

Edited by RyanbabZ71
RyanbabZ71 Senior Enthusiast

RyanbabZ71

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  • Author
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Purge valve going bad.

 

It was changed 6 months (5K miles) ago. HMMM

kstruckcountry Senior Enthusiast

kstruckcountry

Posted
Posted

The purge valve is cheap, might be worth trying...

 

Checking fuel pressure would be what I'd try first though. With colder temps and E85 it wouldn't take much of a pressure drop to cause starting issues.

 

Sent from my SM-G920V using Tapatalk

  • Like 1
muddkatt Senior Enthusiast

muddkatt

Posted
Posted

Chances are the fuel pump is good since it runs fine after firing back up, but its worth checking the pressure to be sure. I had the purge valve issue on a Grand Prix. Took a long time before it finally set a code. It was hard to start after fueling, after a few months, it would miss after it fired up after fueling for less than a minute. It only cost about 25 bucks for one from O’Reilly.

Even though you replaced it a few months back. it might be shot especially if it was from Auto Zone or another crappy auto parts store.

RyanbabZ71 Senior Enthusiast

RyanbabZ71

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It was an OEM ad deodorant version. It was pretty cheap and easy to replace most likely start there

 

 

Sent from my iPad using Tapatalk

Coby7 Senior Enthusiast

Coby7

Posted
Posted

If your purge valve sticks open all the fumes are forced to the plenum and your truck will act like it's flooded. Put pedal to the metal and it should start right up. ( Release pedal at this time or you will really need a new truck :D )

RyanbabZ71 Senior Enthusiast

RyanbabZ71

Posted
  • Author
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Threw a code this morning. Going to run it shortly [emoji1304]

 

 

Ryan B.

RyanbabZ71 Senior Enthusiast

RyanbabZ71

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Posted

P0496 Chevrolet Description The evaporative emission (EVAP) control system limits fuel vapors from escaping into the atmosphere. Fuel tank vapors are allowed to move from the fuel tank, due to pressure in the tank, through the vapor pipe, into the EVAP canister. Carbon in the canister absorbs and stores the fuel vapors. Excess pressure is vented through the vent line and EVAP vent solenoid to the atmosphere. The EVAP canister stores the fuel vapors until the engine is able to use them. At an appropriate time, the PCM will command the EVAP purge valve open, allowing engine vacuum to be applied to the EVAP canister. With the EVAP vent valve open, fresh air will be drawn through the valve and vent line to the EVAP canister. Fresh air is drawn through the canister, pulling fuel vapors from the carbon. The air/fuel vapor mixture continues through the EVAP purge pipe and EVAP purge valve into the intake manifold to be consumed during normal combustion. The EVAP system requires the PCM be able to detect a leak as small as 0.040 inch in the EVAP system. The PCM uses several tests to determine if the EVAP system is leaking.

Possible causes - Faulty EVAP Canister Vent Valve - Faulty EVAP Canister Purge valve - Plugged EVAP canister condition - Faulty EVAP Pressure Sensor - EVAP Canister Vent Valve harness is open or shorted - EVAP Canister Vent Valve circuit poor electrical connection

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