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Fuel smell in cab

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Old 07-09-2018, 07:10 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, 07:53 AM
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Evap purge valve possibly stuck open?
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Old 07-10-2018, 04:19 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, 12:11 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, 01:12 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, 07:48 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, 03:41 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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