propane help!!!! - The 1947 - Present Chevrolet & GMC Truck Message Board Network

67cst · 09-28-2003, 07:44 PM

hey guys, i dont know how to adjust my propane flow...i guess you could call it that, i get real poor mileage and it smells a lot when the truck is running but it isnt driving, is there an adjustment screw somewhere like on a carb? im getting 8 miles to the gallon and that sucks

thanks, Derek

67cst · 09-28-2003, 10:26 PM

just got in from checking my plugs, there was no grunge or oily residue on them, but they had some weird crusty whitish build up on them, nothing really where they spark but more at the base of the electrode...what is this from?

krue · 09-29-2003, 11:19 AM

Grab any Haynes Manual and in the back it will have a spark plug troubleshooting page with pics of various deposits. Really handy. I don't have mine in front of me but it sounds normal.

tom hand · 09-29-2003, 11:39 AM

Plugs sound pretty normal. Where are you getting the smell from? The exhaust from an engine running on propane smells different than one running on gas. Since you will get 20 to 30% worse mpg on propane than you will on gas your mpg sounds about right to me. The "correct" way to adjust propane systems is with a sniffer in the tail pipe, but you can cheat on something run outside. Post a picture of your propane system.

**passthebuck** · 09-29-2003, 12:09 PM

Here in the 'peg - 98% of cabbies run on propane. I'd stop in at an out-of-the-way shop that caters to the cabbies in your area. They'll know exactly how to tune it & probally cheaply too.

67cst · 09-29-2003, 01:10 PM

thanks for the ideas guys, ill try and get some pics in a day or 2 once i get the new rad back in and i can drive it to someones place with a camera

Derek

09-28-2003, 07:44 PM	#1
67cst i love summertime Join Date: Jul 2002 Location: Kelowna BC Posts: 4,302	propane help!!!! hey guys, i dont know how to adjust my propane flow...i guess you could call it that, i get real poor mileage and it smells a lot when the truck is running but it isnt driving, is there an adjustment screw somewhere like on a carb? im getting 8 miles to the gallon and that sucks thanks, Derek __________________ 1967 shortbox stepside Chevy, 365 hp 327, th400. GLOVE BOX LIGHTS FORSALE, click link for info http://67-72chevytrucks.com/vboard/s...d.php?t=273724

09-28-2003, 10:26 PM	#2
67cst i love summertime Join Date: Jul 2002 Location: Kelowna BC Posts: 4,302	just got in from checking my plugs, there was no grunge or oily residue on them, but they had some weird crusty whitish build up on them, nothing really where they spark but more at the base of the electrode...what is this from? __________________ 1967 shortbox stepside Chevy, 365 hp 327, th400. GLOVE BOX LIGHTS FORSALE, click link for info http://67-72chevytrucks.com/vboard/s...d.php?t=273724

09-29-2003, 11:19 AM	#3
krue Designated A-hole! Join Date: Mar 2003 Location: South Mississippi Posts: 36,448	Grab any Haynes Manual and in the back it will have a spark plug troubleshooting page with pics of various deposits. Really handy. I don't have mine in front of me but it sounds normal. __________________ "If it ain't broke, fix it 'til it is!" Being stupid ain't illegal. We're Still Debt Free Except for the House!!! www.daveramsey.com 70 GMC SWB Stepside project "Green Booger" soon to be 6.0l/4l80e 93 S-10 "Poppaw's Truck"

09-29-2003, 11:39 AM	#4
tom hand CCRider Join Date: Feb 2000 Location: Olive Branch,MS,USA Posts: 2,232	Plugs sound pretty normal. Where are you getting the smell from? The exhaust from an engine running on propane smells different than one running on gas. Since you will get 20 to 30% worse mpg on propane than you will on gas your mpg sounds about right to me. The "correct" way to adjust propane systems is with a sniffer in the tail pipe, but you can cheat on something run outside. Post a picture of your propane system. __________________ 72 GMC Sierra SWB almost finished---- 84 Softail Olive Branch MS Last edited by tom hand; 09-29-2003 at 11:45 AM.

09-29-2003, 12:09 PM	#5
passthebuck Sisyphus was my mentor! Join Date: Sep 2002 Location: Carleton Place, Ontario CANADA Posts: 984	Here in the 'peg - 98% of cabbies run on propane. I'd stop in at an out-of-the-way shop that caters to the cabbies in your area. They'll know exactly how to tune it & probally cheaply too. __________________ passthebuck #5642 -TWO 1967 GMC 910's. One with L6/3-on-the tree and the other with 355 w/435hp & a 700r4. -a 2013 Honda Civic as my "sensible" car

09-29-2003, 01:10 PM	#6
67cst i love summertime Join Date: Jul 2002 Location: Kelowna BC Posts: 4,302	thanks for the ideas guys, ill try and get some pics in a day or 2 once i get the new rad back in and i can drive it to someones place with a camera Derek __________________ 1967 shortbox stepside Chevy, 365 hp 327, th400. GLOVE BOX LIGHTS FORSALE, click link for info http://67-72chevytrucks.com/vboard/s...d.php?t=273724

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