Gas hog - The 1947 - Present Chevrolet & GMC Truck Message Board Network

AirSpeed · 03-10-2011, 10:41 PM

I took a little 140 mile round trip in my 72 GMC 4X4 the other day and when I got home my truck was almost empty. I could not believe how much gas I used! As soon as I got home I filled it up again ($60) so I could check the milage. I got up the next morning and my tank was almost empty! Looked under my truck and saw a nice stream of gas flowing out of my fuel pump, the diaphram must have torn. I don't know how I could have missed the smell of at least 15 gallons of gas on the ground, I looked under the truck and could see where the gas had been spraying all over under the truck, I think I am very lucky there wasn't a spark or enough heat to ignite the gas and burn my truck to the ground! Counting nearly two tanks of gas and parts, this was the most expensive fuel pump I ever bought!
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dmack91 · 03-10-2011, 11:12 PM

Check/change your oil too. If the diaphragm tore, it could leak gas into the crankcase. Oil level would be overfilled and diluted.

blue 72 gmc 4x4 · 03-10-2011, 11:13 PM

Quote:

Originally Posted by dmack91

Check/change your oil too. If the diaphragm tore, it could leak gas into the crankcase. Oil level would be overfilled and diluted.

I had that happen on my '59 chevy....but with the carb and it filled the motor up. I was lucky it didnt explode or anything! The motor sure is clean now though!

vectorit · 03-10-2011, 11:18 PM

Yep, seen that before.
Except there was no external leakage, and all the fuel was pumped into the engine.

Interesting when you go to drain the oil with a pan big enough for a few quarts, only to get a few gallons of unleaded first then 5 quarts of engine oil.

BTW, the engines bearings were toasted and the engine had to be torn down in my case.

This was a friends old elCamino that he asked me to troubleshoot why it wouldn't start...

**70C10Toejam** · 03-10-2011, 11:49 PM

Man, real lucky finding the leak before more than the gas was lost.
Found a gas leak in a '70 Bug I used to have from the massive loss of gas, 'cept it was in a fuel line IN the engine compartment

AirSpeed · 03-11-2011, 12:36 AM

Quote:

Originally Posted by dmack91

Check/change your oil too. If the diaphragm tore, it could leak gas into the crankcase. Oil level would be overfilled and diluted.

I hope that didn't happen in my case! Now you got me worried! I never even thought about that! I am going to change the oil first thing in the morning.

Thanks a lot for pointing that out!
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Longhorn Man · 03-11-2011, 12:40 AM

go out and check the oil now. If it is way over full, then you know you need to change the oil. If it is where it should be, then there is no need.

oldblue1968chevy · 03-11-2011, 12:45 AM

I lost a motor this way too..

Check your oil! And DRAIN it quick then change it a time or 2 and hope for the best..

Although it was a good excuse to build a new motor

AirSpeed · 03-11-2011, 12:54 AM

Quote:

Originally Posted by Longhorn Man

go out and check the oil now. If it is way over full, then you know you need to change the oil. If it is where it should be, then there is no need.

I just went out and checked it, the oil level seems fine, I couldn't smell any gas in it and it looked clean. I just changed the oil a month ago but I am going to change it tomorrow anyway, it's a lot cheaper than rebuilding the engine! I just hope if there is gas in the oil that I haven't done any damage! I have put exactly 23 miles on it since I replaced the pump. All right every one, tell me it's gonna be ok!
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*project 67 sub* · 03-11-2011, 01:29 AM

it should be ok

AirSpeed · 03-11-2011, 01:54 AM

Quote:

Originally Posted by project 67 sub

it should be ok

Thanks! Now I can sleep!
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*project 67 sub* · 03-11-2011, 01:59 AM

lol, your welcome

AirSpeed · 03-11-2011, 10:44 PM

Well I drained my oil today, I had changed it less than a month ago so the oil should have been fairly clean, it was clean the last time I drained it, this time the oil was black, I mean black. It was also thinner than it should have been. When I checked it this morning it was a quart high, I assume that extra quart could be gas. I bought five quarts of cheap oil, dumped out the filter and put it back on and ran the engine awhile, drained it, changed the filter and then refilled it with some good oil.
The engine still runs great, smooth, good oil pressure and doesn't heat up at all. I think I escaped without any damage. I will definately remember to check my oil out if I ever have another fuel pump fail!
Thanks to all who suggested I check out the oil for gas! You may have saved an engine!
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03-10-2011, 10:41 PM	#1
AirSpeed Registered User Join Date: Jul 2007 Location: Fall River California Posts: 2,026	Gas hog I took a little 140 mile round trip in my 72 GMC 4X4 the other day and when I got home my truck was almost empty. I could not believe how much gas I used! As soon as I got home I filled it up again ($60) so I could check the milage. I got up the next morning and my tank was almost empty! Looked under my truck and saw a nice stream of gas flowing out of my fuel pump, the diaphram must have torn. I don't know how I could have missed the smell of at least 15 gallons of gas on the ground, I looked under the truck and could see where the gas had been spraying all over under the truck, I think I am very lucky there wasn't a spark or enough heat to ignite the gas and burn my truck to the ground! Counting nearly two tanks of gas and parts, this was the most expensive fuel pump I ever bought! Posted via Mobile Device

03-10-2011, 11:12 PM	#2
dmack91 Registered User Join Date: Jan 2011 Location: Redmond, OR Posts: 763	Re: Gas hog Check/change your oil too. If the diaphragm tore, it could leak gas into the crankcase. Oil level would be overfilled and diluted. __________________ 68 Chev C20- son has it now 83 K20 - bought from son 70 C20 - in progress

03-10-2011, 11:18 PM	#4
vectorit What? Join Date: Jun 2007 Location: Southern California Posts: 7,617	Re: Gas hog Yep, seen that before. Except there was no external leakage, and all the fuel was pumped into the engine. Interesting when you go to drain the oil with a pan big enough for a few quarts, only to get a few gallons of unleaded first then 5 quarts of engine oil. BTW, the engines bearings were toasted and the engine had to be torn down in my case. This was a friends old elCamino that he asked me to troubleshoot why it wouldn't start... __________________ Chris 1968 K20 Suburban 1972 K10 LWB PU

03-10-2011, 11:49 PM	#5
70C10Toejam Hellasick Join Date: Jul 2006 Location: Death Moans, IA Posts: 876	Re: Gas hog Man, real lucky finding the leak before more than the gas was lost. Found a gas leak in a '70 Bug I used to have from the massive loss of gas, 'cept it was in a fuel line IN the engine compartment __________________ I keep two MAGNUMS in my desk. One's a gun, and I keep it loaded. The other's a bottle and it keeps ME loaded. I'm Tracer Bullet. (Calvin and Hobbes) This life was a test. It was only a test. If this had been an actual life, you would have received instructions on where to go and what to do. RED meat is not bad for you...FUZZY BLUE/GREEN MEAT is bad for you!!!!!!!!!!!!! BUILT FORD TOUGH WITH CHEVY STUFF--sticker at Goodguys

03-11-2011, 12:40 AM	#7
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	Re: Gas hog go out and check the oil now. If it is way over full, then you know you need to change the oil. If it is where it should be, then there is no need.

03-11-2011, 12:45 AM	#8
oldblue1968chevy Grandpa in the rustmobile... Join Date: Nov 2008 Location: Spokane WA/Viola TN Posts: 11,422	Re: Gas hog I lost a motor this way too.. Check your oil! And DRAIN it quick then change it a time or 2 and hope for the best.. Although it was a good excuse to build a new motor __________________ John Goose-1968 C10 355,9.32-1CR, Vortec Heads ,262 voodoo, 3.73:1 3OTT (HS ride/beater/farm truck) http://67-72chevytrucks.com/vboard/s...d.php?t=317684 Grams 53-1953 Chevrolet Belair http://67-72chevytrucks.com/vboard/s...=1#post4327784 1969 Chevy C10 Shortbed 4.5/6?" Frame off resto http://67-72chevytrucks.com/vboard/s...d.php?t=548136 1999 Toyota Tacoma 4x4

03-11-2011, 01:29 AM	#10
project 67 sub Account Suspended Join Date: Mar 2007 Location: san bernardino ca. everywhere Posts: 3,938	Re: Gas hog it should be ok

03-11-2011, 01:59 AM	#12
project 67 sub Account Suspended Join Date: Mar 2007 Location: san bernardino ca. everywhere Posts: 3,938	Re: Gas hog lol, your welcome

03-11-2011, 10:44 PM	#13
AirSpeed Registered User Join Date: Jul 2007 Location: Fall River California Posts: 2,026	Re: Gas hog Well I drained my oil today, I had changed it less than a month ago so the oil should have been fairly clean, it was clean the last time I drained it, this time the oil was black, I mean black. It was also thinner than it should have been. When I checked it this morning it was a quart high, I assume that extra quart could be gas. I bought five quarts of cheap oil, dumped out the filter and put it back on and ran the engine awhile, drained it, changed the filter and then refilled it with some good oil. The engine still runs great, smooth, good oil pressure and doesn't heat up at all. I think I escaped without any damage. I will definately remember to check my oil out if I ever have another fuel pump fail! Thanks to all who suggested I check out the oil for gas! You may have saved an engine! Posted via Mobile Device

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