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Fuel smell in cab

Old 07-09-2018, 08:10 AM
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Default Fuel smell in cab

When i drive my truck hard i get a strong smell of raw fuel in the cab. I have changed the plugs and then after about 100 miles i rechecked them with a torque rench. The smell was there before i changed the plugs. Does the fuel pressure increase when you floor it? If so can i pressurise the fuel system with out the engine running to check for leaks?
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Old 07-09-2018, 08:53 AM
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Evap purge valve possibly stuck open?
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Old 07-10-2018, 05:19 PM
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It smells just like a fuel leak! How do you test purge valve? Anyone know how to run full fuel pressure without engine running. Can I jump a relay?
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Old 07-11-2018, 01:11 PM
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Default With the key on the fuel pressure should be there

If you are smelling it in cab I would think leak is up front . Good chance its orings on injectors . You can pull the whole fuel rail out still connected and put newspaper under it and look for drops . Reinstall using motor oil on orings , Its not a hard job to do . Place some newspaper under fuel filter to see if its there .
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Old 07-11-2018, 02:12 PM
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Thanks redfishrd but it only seems to smell/leak under full load so it might be a case of changing o rings and try again unless you know how to get full fuel pressure with engine off or not moving
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Old 07-11-2018, 08:48 PM
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Default The pcm determines the pressure from calculation from pressure difference across the

Injector. Not a static atmospheric pressure like a tire . The vacuum created in cyl etc . I am not explaining it very well but I understand the principal .As it sets with key on I think it will run around 40 psi . Torque pro gives you the running pressure from the pcm ..
This system uses a fpdm module on rear axle, the various inputs lets it make a decision to run fuel pump . This eliminates need for a return line or fuel pressure regulator . There is a sensor on the fuel rail that is vacuum assisted to sense acceleration , This sensor feeds fpdm also ,it has a gasket so that is a potential leak point .
Fpdm only has electrical inputs . Fpdm is a high corrosion fail item due to electrolysis if yours isn't bad it most likely will be . New ones are on plastic standoffs to prevent aluminum steel contact .
The most common fuel smell complaint is caused by lose plugs as I am sure you checked for plugs should be torqued to 25 -28 foot pounds . If you pull fuel rails change all orings which are available from local box stores . Carefully blow out area to stop trash from going into intake . Motor oil on orings make them easy to plug in . If over 125k mi I change injectors for new not reman . Leaking injectors can damage engine easily . They are a heavy duty cycle part .
I see you had trouble with the vent line on your gas tank could they be related .
If your gas purge emissions system in trouble it should be setting codes .It checks for a leak by applying vacuum .You have a purge solenoid back on the axle ,some guys have had that trouble as well as rotted lines in this system.
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Old 07-12-2018, 04:41 AM
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Thanks Redfishtd. I will check the lines this weekend. I think i will try and get it on a rolling road so i can look under bonnet while under load. Yes the vent pipe came off a couple of months ago so may be the tank is pressure in it. When i bought the truck about 6 months ago (2000 miles) there was no gas filled cap on! I will also check the control unit on rear axle to see if it is corroded up
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Old 08-28-2018, 05:11 PM
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Well I finally got to the bottom of my fuel smell. After ordering injector seals from rock auto and them being wrong I got new seals from here in the UK. Fitted them and it’s perfect now

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Old 08-28-2018, 07:44 PM
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Originally Posted by redfishtd View Post
...
The most common fuel smell complaint is caused by lose plugs as I am sure you checked for plugs should be torqued to 25 -28 foot pounds . ..
Im glad I read about this. A few days ago my friend stopped by and said he smelled gas in his cab from the air conditioner vents. We checked plugs and all four on the right side were loose. He had recently had the phasers+ issue fixed on his 2004 5.3L 3-valve, and apparently the mechanic had removed but failed to retighten the plugs!
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Old 08-30-2018, 07:28 AM
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Originally Posted by Mark Cameron View Post
Well I finally got to the bottom of my fuel smell. After ordering injector seals from rock auto and them being wrong I got new seals from here in the UK. Fitted them and itís perfect now

Awesome! Thanks for reporting back!
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