pulled oil drain plug,drained 5 gallons of fuel!?!? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

tywhitty · 12-30-2002, 04:06 AM

my truck has been sitting for a while (4 months) and I decided to get it running... well I checked the oil and it seemed awfully high and lean... I pulled the oil drain plug and out comes enough oil\gas to fill a 5 gallon bucket! What the hell is going on here? Cracked intake manifold? Carb? Neighborhood kids playing pranks? Any suggestions? Thanks 67 C-10 3/4 327/TH400

Hooter · 12-30-2002, 04:11 AM

Well i would have to say your motor was reeeaally flooded. your oil turned real bad or someone is trying to make a monkey out of you. Welcome to the board from not too far North of you! Are you sure its oil and gas or could it be water?

BobbyK · 12-30-2002, 04:13 AM

My bet it a bad fuel pump.If the diaphram gets a hole in it the truck may still run but at the same time it will dump fuel into the block(which ends up in your pan).DON'T run your eng. untill you change the oil.Let's hope your bearing damage is minimal.
You can check the fuel pump by applying vacume to the "in" side of the pump(where the fuel line from the tank is connected to the pump)If it won't hold vacume the diaphram has a hole in it.
Good luck.

Hooter · 12-30-2002, 04:17 AM

well with all that gas in there, I would be pretty sure the motor is clean inside

jku72 · 12-30-2002, 06:15 AM

Fuel pump. Been there, done that.

*67/72junkie* · 12-30-2002, 10:27 AM

If float sticks in the down position while parked it will do this when fuel pressure is applied.Turning to start. Also could be fuel pump as others said.

wnc mountain · 12-30-2002, 11:06 AM

I'll vote for fuel pump! don't think you could get that much gas in the oil from the float sticking, though i could be wrong.

cheyenne10 · 12-30-2002, 01:52 PM

I'm not real familiar with electric fuel pumps but have seen them where the pump still runs when key in on position and truck not running. Wouldn't this situation dump loads of fuel into motor with truck equiped with el. fuel pump and someone listening to radio?

Does anyone run an electric fuel pump and how does theirs work? Maybe a better option if used right avoiding diaphram hole situations.

Not trying to change subject of this post maybe we should start another.

red71cheyenne · 12-30-2002, 02:08 PM

No, the fuel pump only runs for 2 seconds without distributor input. On fuel injected models anyway. Didn't think about the not fuel injected ones. Dang. Sounds like a mechanical fuel pump problem though. I'd check the diaphragm. Jeff.

*racedvl* · 12-30-2002, 02:37 PM

FUEL PUMP!!!!!!!!!!!!!!!!!

**COBALT** · 12-30-2002, 02:47 PM

I would agree with the fuel pump. You can at least pull it off and inspect the diaphram and gasket!

Iron-Butt · 12-30-2002, 04:23 PM

We had the same problem on the chevelle. fised the pump and changed the oil. it works just fine.

Hooter · 12-30-2002, 08:16 PM

Oh i put a new 300 6 into my 1981 f150. the motor came out of a fuel injected truck but i put a carb back on it. There were no provisons for a mechanical fuel pump so I put and electric one on. If I don't start the truck right away it will flood like a s.o.b

lofly'a · 12-30-2002, 09:57 PM

hey hooter, if it floods that quick you either have too much pump pressure or the needle valve and seat is not holding in the carb. you only need about 7 to 12 psi for the carb, and you can install a fuel regulator inline to solve that problem. if the needle and seat are'nt holding you're sucking down way too much fuel.

RShaips · 12-31-2002, 12:12 AM

FUEL PUMP! been there done that 3 Times !

bouncytruck · 12-31-2002, 12:30 PM

I have no idea what the problem is, but welcome to the board from Bothell.

robby · 12-31-2002, 10:59 PM

that happened to my dad he trashed his engine unfortunately

12-30-2002, 04:06 AM	#1
tywhitty Registered User Join Date: Oct 2002 Location: Auburn,WA Posts: 1	pulled oil drain plug,drained 5 gallons of fuel!?!? my truck has been sitting for a while (4 months) and I decided to get it running... well I checked the oil and it seemed awfully high and lean... I pulled the oil drain plug and out comes enough oil\gas to fill a 5 gallon bucket! What the hell is going on here? Cracked intake manifold? Carb? Neighborhood kids playing pranks? Any suggestions? Thanks 67 C-10 3/4 327/TH400

12-30-2002, 04:11 AM	#2
Hooter My other Love Join Date: Aug 2001 Location: Castlegar B.C. Canada Posts: 4,085	Well i would have to say your motor was reeeaally flooded. your oil turned real bad or someone is trying to make a monkey out of you. Welcome to the board from not too far North of you! Are you sure its oil and gas or could it be water? __________________ Castlegar B.C.The great white North (Canada Eh!) Hooter_5@hotmail.com First generation Monte Carlo club pictures of my life

12-30-2002, 04:13 AM	#3
BobbyK Registered User Join Date: May 2000 Location: Petrolia,Ontario,Canada but working in Port Huron,Mi. Posts: 1,772	My bet it a bad fuel pump.If the diaphram gets a hole in it the truck may still run but at the same time it will dump fuel into the block(which ends up in your pan).DON'T run your eng. untill you change the oil.Let's hope your bearing damage is minimal. You can check the fuel pump by applying vacume to the "in" side of the pump(where the fuel line from the tank is connected to the pump)If it won't hold vacume the diaphram has a hole in it. Good luck. __________________ 71 blazer,350SBC,approx.375HP,700R4,factory GM TPI.Dual electric fans,33x12.5x15 ATR on stock suspension. Petrolia,Ontario,Canada but working in Port Huron,MI. See ALL my Blazer pic's HERE Last edited by BobbyK; 12-30-2002 at 05:01 AM.

12-30-2002, 04:17 AM	#4
Hooter My other Love Join Date: Aug 2001 Location: Castlegar B.C. Canada Posts: 4,085	well with all that gas in there, I would be pretty sure the motor is clean inside __________________ Castlegar B.C.The great white North (Canada Eh!) Hooter_5@hotmail.com First generation Monte Carlo club pictures of my life

12-30-2002, 06:15 AM	#5
jku72 Registered User Join Date: Jan 2002 Location: cornville, maine Posts: 659	Fuel pump. Been there, done that. __________________ jku Cornville, Maine 68 C10 burb 42 Willys MB 46 Dodge WF-32 1.5 ton 53 & 56 Olds' 60 Cadillac 22 Dodge Brothers

12-30-2002, 10:27 AM	#6
67/72junkie Account Suspended Join Date: Oct 2002 Location: NC Posts: 1,129	fuel If float sticks in the down position while parked it will do this when fuel pressure is applied.Turning to start. Also could be fuel pump as others said.

12-30-2002, 11:06 AM	#7
wnc mountain More hobbies than money! Join Date: Jan 2002 Location: Raleigh, nc, usa Posts: 655	I'll vote for fuel pump! don't think you could get that much gas in the oil from the float sticking, though i could be wrong. __________________ '70 cst10/swb 350, 3 on the tree, factory buckets. '70 GMC lwb 350/350 ps,pb '72 c-10 lwb 350/350 a/c, ps, pb '72 Blazer project

12-30-2002, 01:52 PM	#8
cheyenne10 Senior Member Join Date: Apr 2000 Location: Oregon Posts: 2,512	electric fuel pump I'm not real familiar with electric fuel pumps but have seen them where the pump still runs when key in on position and truck not running. Wouldn't this situation dump loads of fuel into motor with truck equiped with el. fuel pump and someone listening to radio? Does anyone run an electric fuel pump and how does theirs work? Maybe a better option if used right avoiding diaphram hole situations. Not trying to change subject of this post maybe we should start another. __________________ Bob

12-30-2002, 02:08 PM	#9
red71cheyenne Back in the sticks Join Date: Jan 2001 Location: Fordland, MO Posts: 3,188	No, the fuel pump only runs for 2 seconds without distributor input. On fuel injected models anyway. Didn't think about the not fuel injected ones. Dang. Sounds like a mechanical fuel pump problem though. I'd check the diaphragm. Jeff. __________________ 1971 Cheyenne C-10 w/700R4 and Tuned Port Injection 1969 K5 Blazer w/Tuned Port 2010 2SS/RS Flaming Orange Camaro 2011 K1500 Suburban 2014 K1500 Pickup 2008 Nissan Altima? The wifes' hoopty

12-30-2002, 02:37 PM	#10
racedvl Account Suspended Join Date: Jan 2000 Location: Woodstock, IL Posts: 7,020	FUEL PUMP!!!!!!!!!!!!!!!!!

12-30-2002, 02:47 PM	#11
COBALT Senior Member Join Date: Sep 2001 Location: Seattle, WA, USA Posts: 5,817	I would agree with the fuel pump. You can at least pull it off and inspect the diaphram and gasket! __________________ '69 3/4 ton C20 2wd-350ci/TH400 '69 3/4 ton Custom 20 2wd-350ci/4sp Manual '99 2wd 5.7 Chevy Tahoe Seattle, WA.

12-30-2002, 04:23 PM	#12
Iron-Butt 454 club Join Date: Oct 2002 Location: Oklahoma Posts: 1,348	fuel pump We had the same problem on the chevelle. fised the pump and changed the oil. it works just fine. __________________ David 1965 Chevrolet c-10 454 automatic Custom bbw swb. 1965 Chevrolet C-10 swb (Sold) 1963 Chevrolet C-10 6 Cyl automatic with dual exhaust, pb, ps and 17's. R.I.P "I will miss you. 1967 Chevrolet C-10 6 Cyl Custom lwb 1939 Chevrolet Coupe, 350 v8 automatic. 1935 Chevrolet 2 Dr Standard in the works. 2015 Harley Davidson Street Glide. 2023 Chevrolet Stingray Z51 Convertible. I never want to grow up.

12-30-2002, 08:16 PM	#13
Hooter My other Love Join Date: Aug 2001 Location: Castlegar B.C. Canada Posts: 4,085	Oh i put a new 300 6 into my 1981 f150. the motor came out of a fuel injected truck but i put a carb back on it. There were no provisons for a mechanical fuel pump so I put and electric one on. If I don't start the truck right away it will flood like a s.o.b __________________ Castlegar B.C.The great white North (Canada Eh!) Hooter_5@hotmail.com First generation Monte Carlo club pictures of my life

12-30-2002, 09:57 PM	#14
lofly'a Registered User Join Date: May 2000 Location: Alexandria, LA 71301 Posts: 1,451	hey hooter, if it floods that quick you either have too much pump pressure or the needle valve and seat is not holding in the carb. you only need about 7 to 12 psi for the carb, and you can install a fuel regulator inline to solve that problem. if the needle and seat are'nt holding you're sucking down way too much fuel. __________________ -02 avalanche (daily driver) -66 gto ragtop 389/400 (garage queen, hand-me-down from dad) -72 Tribute Trans Am (6.0LS/T56 6-speed) in progress -2003 YUKON (Wife's) -71 gmc swb fleet (current project, gonna shave everything, bags, stuff w/ 20's, gen III powertrain) -48 3100 SWB - 12/31/23 LONG TERM Project

12-31-2002, 12:12 AM	#15
RShaips Senior Member Join Date: Jun 2002 Location: Augusta Missouri Posts: 804	FUEL PUMP! been there done that 3 Times !



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12-31-2002, 12:30 PM	#16
bouncytruck SKINNY TIRES RULE! Join Date: Sep 2001 Location: Bothell, WA Posts: 11,038	I have no idea what the problem is, but welcome to the board from Bothell. __________________ bouncytruck 1972 K5 The Hauler 1994 K1500 Suburban The Daily2010 Kia Soul Wife's Ride2014 Fiat 500L

12-31-2002, 10:59 PM	#17
robby Semper Fidelis Join Date: Dec 2001 Location: Cedar City, Utah Posts: 654	that happened to my dad he trashed his engine unfortunately __________________ 72 Chevy C 20 with 402 For sale 85 GMC K2500 83 Trans Am Cedar City, Utah (Missouri Native)

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