[C1] Gas Fumes Restomod
02-16-2019, 01:52 PM
#1
Instructor
Thread Starter
Gas Fumes Restomod
Recent build 62 restomod with LS3 engine parked in enclosed trailer (trailer vents semi closed) noticeable gas fumes. No Leaks.
Anyone install a EVAP System? If so please provided specifics.
Anyone install a EVAP System? If so please provided specifics.
02-17-2019, 01:41 PM
#2
are you using a sealed or vented gas cap?
you are sure none of the injectors are leaking?
you are sure none of the injectors are leaking?
02-17-2019, 02:16 PM
#3
Le Mans Master
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A fuel injected engine requires significantly more fuel tank venting than a stock tank can provide. If the engine is running perfectly or you did the install and know how it was vented, it maybe that the vent is open to atmosphere. The easiest way to address this, and how I’m doing it on the efi engine in my C2, is to get a fuel filter with a replaceable element, fill it with charcoal designed for fish tank filters and plumb it above the tank is the vent line. You can buy it loose at most pet shops or online. Works really well.
02-17-2019, 04:40 PM
#4
Instructor
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02-18-2019, 09:58 AM
#8
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02-18-2019, 10:00 AM
#9
Instructor
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02-18-2019, 10:03 AM
#10
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02-18-2019, 10:16 AM
#11
Safety Car
I have an LS in my 66 goat. It has a very small vent in the filler neck, maybe 3/16" i.d. at most. I have a non vented cap. No issues with it just over 10,000 miles on it. I would look very closely at every pressurized fuel connection. The rubber o rings around the injectors, any connections on the fuel rail, and from the tank to the fuel rail. Find out what type of return line you have. Most that I know of use the Vette fuel filter that bypasses fuel back to the tank, check there as well. If your set uses a regulator check it as well. You should be able to find it by just turning on the ignition and letting it pressurize. Any oring so I've had leak at the injectors showed up easily. But they are also big leaks I would suspect you would have found them early on.
Last edited by Robert61; 02-18-2019 at 10:19 AM.
02-18-2019, 10:22 AM
#12
Instructor
Thread Starter
I have an LS in my 66 goat. It has a very small vent in the filler neck, maybe 3/16" i.d. at most. I have a non vented cap. No issues with it just over 10,000 miles on it. I would look very closely at every pressurized fuel connection. The rubber o rings around the injectors, any connections on the fuel rail, and from the tank to the fuel rail. Find out what type of return line you have. Most that I know of use the Vette fuel filter that bypasses fuel back to the tank, check there as well. If your set uses a regulator check it as well. You should be able to find it by just turning on the ignition and letting it pressurize. Any oring so I've had leak at the injectors showed up easily. But they are also big leaks I would suspect you would have found them early on.
02-18-2019, 01:18 PM
#13
Drifting
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I've driven two LS3 powered restomods and both smelled of gasoline. I was told the computer needed to be reprogramed for leaner running, since neither was running a catalytic converter. Both were recent completions and neither had been reprogramed.
BH
BH
02-18-2019, 05:15 PM
#15
Instructor
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Thanks for the reply!
02-18-2019, 05:22 PM
#16
Instructor
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02-18-2019, 07:00 PM
#17
Safety Car
No cats on my goat and no gas smell.
No gold fish either! Lol
No gold fish either! Lol
Last edited by Robert61; 02-18-2019 at 07:09 PM.
02-18-2019, 08:01 PM
#18
Intermediate
Modern spark ignited engines are controlled to a stoichiometric air/fuel ratio (14.7:1) under normal operating conditions. You do not run the engine rich under normal operating conditions because you would just be wasting fuel and generate a continuous exothermic reaction in the catalyst. You do not run the engine lean under normal operating conditions because NOx emissions cannot be reduced in a lean environment with a standard catalyst. Engines will typically only run rich for a short duration during engine startup/catalyst light-off and during WOT accelerations.
So…The rich operation needed during catalyst light-off could be eliminated if you do not have a catalyst. This is a relatively short duration (<1 minute) so hard to believe it would lead to too much of a gasoline smell. You would want to keep rich operation during WOT acceleration because this not only protects the catalyst but also provides greater power.
So…The rich operation needed during catalyst light-off could be eliminated if you do not have a catalyst. This is a relatively short duration (<1 minute) so hard to believe it would lead to too much of a gasoline smell. You would want to keep rich operation during WOT acceleration because this not only protects the catalyst but also provides greater power.
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mike coletta (02-19-2019)
02-18-2019, 08:06 PM
#19
Instructor
Thread Starter
Modern spark ignited engines are controlled to a stoichiometric air/fuel ratio (14.7:1) under normal operating conditions. You do not run the engine rich under normal operating conditions because you would just be wasting fuel and generate a continuous exothermic reaction in the catalyst. You do not run the engine lean under normal operating conditions because NOx emissions cannot be reduced in a lean environment with a standard catalyst. Engines will typically only run rich for a short duration during engine startup/catalyst light-off and during WOT accelerations.
So…The rich operation needed during catalyst light-off could be eliminated if you do not have a catalyst. This is a relatively short duration (<1 minute) so hard to believe it would lead to too much of a gasoline smell. You would want to keep rich operation during WOT acceleration because this not only protects the catalyst but also provides greater power.
So…The rich operation needed during catalyst light-off could be eliminated if you do not have a catalyst. This is a relatively short duration (<1 minute) so hard to believe it would lead to too much of a gasoline smell. You would want to keep rich operation during WOT acceleration because this not only protects the catalyst but also provides greater power.
02-19-2019, 05:34 AM
#20
Safety Car
Modern spark ignited engines are controlled to a stoichiometric air/fuel ratio (14.7:1) under normal operating conditions. You do not run the engine rich under normal operating conditions because you would just be wasting fuel and generate a continuous exothermic reaction in the catalyst. You do not run the engine lean under normal operating conditions because NOx emissions cannot be reduced in a lean environment with a standard catalyst. Engines will typically only run rich for a short duration during engine startup/catalyst light-off and during WOT accelerations.
So…The rich operation needed during catalyst light-off could be eliminated if you do not have a catalyst. This is a relatively short duration (<1 minute) so hard to believe it would lead to too much of a gasoline smell. You would want to keep rich operation during WOT acceleration because this not only protects the catalyst but also provides greater power.
So…The rich operation needed during catalyst light-off could be eliminated if you do not have a catalyst. This is a relatively short duration (<1 minute) so hard to believe it would lead to too much of a gasoline smell. You would want to keep rich operation during WOT acceleration because this not only protects the catalyst but also provides greater power.
As to charcoal filters, are you kidding me???? You either have a leak (raw gasoline), or you have a hole directly into the tank area. My experience has been that the evaporation of raw gas is what causes "fumes" in an enclosed area. I vented cap will not cause this.
