Help! Engine Full Of Gas, Wont Start?! - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Twilightoptics · 08-21-2002, 02:59 AM

I put an electric fuel pump 5.5-9.0 psi on my truck. Which I just put a 305 in. Everything ran FINE for about 30miles. Then it died. Tried to start it and it turns but doesn't start. I have spark..... Look at the carb with the Key on... and the fuel pump is pumping gas into the carb. So the engine is completely flooded!~ The carburator is the stock spread bore that was rebuilt about 600 miles ago.

IDEAS PEOPLE?!

O'l Buck · 08-21-2002, 03:13 AM

if you've got gas running through the carb into the engine, either the float has gone bad and won't shut the fuel off, the needle has lost it's seal and isn't seating properly with the seat, or your base plate has warped on the carb or a gasket has started leaking......any way you look at it, it's time to take the carb apart againl.

Twilightoptics · 08-21-2002, 03:16 AM

Would the fuel pump have caused this? Or just bad carb parts? I didn't rebuild it, shop did it for me.

*67Fleetsidedream* · 08-21-2002, 07:09 AM

I think that either you blew a seal in the carb or your float/s are stuck open. Your best fix for this would be to get a Carter AFB 600 or a Edelbrock carb. I had a carb that did the same thing. I was frustrated when I couldn't fix the problem and just replaced mine.

Ben

bigjimzlll · 08-21-2002, 09:00 AM

which pump are you using? too much fuel pressure can cause havoc, with stock non-performance carbs. ie: edelbrock recomends no more than 5lbs of pressure(or flooding will occur)

1971LT1SWBPOSI373 · 08-21-2002, 09:58 AM

I used a Carter electric pump on my '72 (the rotary type, they are pretty silent in comparison to others that sound like a McCulloch chain saw under your truck) along with a Carter AFB on a Edelbrock Performer..... and it's a real good setup with the electric choke. Bending up a steel fuel line took a while, but I was pleased with the results.

Oh, BTW. It sounds like you don't have that pump wired correctly, because with a proper installation you should not get ANY fuel flow with just a key turned in the "on" position. These pumps get wired into the starter solenoid wiring, have an oil pressure cut off switch, and an impact switch. All of these are safety features in the event of an accident to shut that pump off. If you don't have these installed, just hope you can turn the key off in the event of an accident...... or that pump will continue pumping until the tank is dry.... or the battery goes dead. And let's not talk about fire. Something to consider. TJ

Gordo · 08-21-2002, 04:53 PM

Too much psi for your set up, IMO. Why not use the stock mechanical pump?

71GMC_3/4T · 08-21-2002, 05:25 PM

My guess is you got a chunk of dirt or teflon thread tape in the fuel line when you put in the electric pump.
Either that, or too much fuel pressure like the others are saying. You might want to try a fuel pressure regulator up by the carb. I had the same prob once and it really sucks driving with one hand up under the dash, connecting and disconnecting the inline fuse to get the rest of the way home without flooding! That was when I put a switch in the fuel pump wire and a regulator under the hood. Never had to use the switch though, except to keep thieves from getting very far... It was kind of funny when the guy who bought the truck only made it half a block away and came walking back to my house with a "what the hell did I buy?" look on his face!

Twilightoptics · 08-21-2002, 05:32 PM

It was a piece of metal stuck in the needle housing. Carb man fixed her up no charge. Whew.

08-21-2002, 02:59 AM	#1
Twilightoptics Registered User Join Date: Apr 2002 Location: Vancouver, WA. USA Posts: 38	Help! Engine Full Of Gas, Wont Start?! I put an electric fuel pump 5.5-9.0 psi on my truck. Which I just put a 305 in. Everything ran FINE for about 30miles. Then it died. Tried to start it and it turns but doesn't start. I have spark..... Look at the carb with the Key on... and the fuel pump is pumping gas into the carb. So the engine is completely flooded!~ The carburator is the stock spread bore that was rebuilt about 600 miles ago. IDEAS PEOPLE?! __________________ http://4.65.252.68/hosted/twilightsig.jpg 1967 Chevy Pickup: '85 Camaro 305 Rebuilt carb - Turbo 400 Trans Flowtech headers to Purple Hornies

08-21-2002, 03:13 AM	#2
O'l Buck Recovering Truck Driver Join Date: Mar 2002 Location: Orleans, NE USA Posts: 1,883	if you've got gas running through the carb into the engine, either the float has gone bad and won't shut the fuel off, the needle has lost it's seal and isn't seating properly with the seat, or your base plate has warped on the carb or a gasket has started leaking......any way you look at it, it's time to take the carb apart againl. __________________ 67 K-20 350, SM465, Eaton rear, 4.56 no spin option 00 Dodge 2500 4x4, 24V cummins, 5 speed Chad South Central Nebraska

08-21-2002, 03:16 AM	#3
Twilightoptics Registered User Join Date: Apr 2002 Location: Vancouver, WA. USA Posts: 38	Would the fuel pump have caused this? Or just bad carb parts? I didn't rebuild it, shop did it for me. __________________ http://4.65.252.68/hosted/twilightsig.jpg 1967 Chevy Pickup: '85 Camaro 305 Rebuilt carb - Turbo 400 Trans Flowtech headers to Purple Hornies

08-21-2002, 09:00 AM	#5
bigjimzlll Senior Member Join Date: Dec 2001 Location: Redding,CA...USA Posts: 4,736	which pump are you using? too much fuel pressure can cause havoc, with stock non-performance carbs. ie: edelbrock recomends no more than 5lbs of pressure(or flooding will occur) __________________ It's called "drag racing" if they called it "tic..tic..WHAM!..BANG! F*&K!!!", they'd have to keep the magazines under the counter with the other men's publications click the clicky to join the site.... http://67-72chevytrucks.com/vboard/payments.php 67 lwb..first hotrod in 25 years..540 best ET is 9.45 @ 141.44 Anderson,CA

08-21-2002, 09:58 AM	#6
1971LT1SWBPOSI373 Registered User Join Date: Mar 2002 Location: Springfield, VA Posts: 460	I used a Carter electric pump on my '72 (the rotary type, they are pretty silent in comparison to others that sound like a McCulloch chain saw under your truck) along with a Carter AFB on a Edelbrock Performer..... and it's a real good setup with the electric choke. Bending up a steel fuel line took a while, but I was pleased with the results. Oh, BTW. It sounds like you don't have that pump wired correctly, because with a proper installation you should not get ANY fuel flow with just a key turned in the "on" position. These pumps get wired into the starter solenoid wiring, have an oil pressure cut off switch, and an impact switch. All of these are safety features in the event of an accident to shut that pump off. If you don't have these installed, just hope you can turn the key off in the event of an accident...... or that pump will continue pumping until the tank is dry.... or the battery goes dead. And let's not talk about fire. Something to consider. TJ __________________ 1971 Shortbed 350/350 w/ Posi-traction 3:73's 1996 Chevy Silverado TJ in Springfield, Virginia Likes old Chevy trucks Drinks Miller MGD

08-21-2002, 07:09 AM	#4
67Fleetsidedream Wiseass secured himself a BAN Join Date: Nov 2000 Location: MOON!!! Posts: 2,282	I think that either you blew a seal in the carb or your float/s are stuck open. Your best fix for this would be to get a Carter AFB 600 or a Edelbrock carb. I had a carb that did the same thing. I was frustrated when I couldn't fix the problem and just replaced mine. Ben

08-21-2002, 04:53 PM	#7
Gordo Registered User Join Date: Jan 2001 Location: Killingworth, CT. USA Posts: 3,378	Too much psi for your set up, IMO. Why not use the stock mechanical pump? __________________ 1971 C10 swb stepside 350/700R4/3.73posi (retired as of 4/22/03) 1998 S10 short bed 2002 S10 Blazer 1942 Oldsmobile 1958 Massey Harris Pony 1951 Wife Killingworth, Connecticut May those who love us, love us, any of those who do not love us, may God turn their hearts. And if God is unable to turn their hearts, may he turn their ankles so we may know them by their limping. A man who works with his hands is a laborer; a man who works with his hands and his brain is a craftsman; but a man who works with his hands and his brain and his heart is an artist.

08-21-2002, 05:25 PM	#8
71GMC_3/4T Weapons Of Construction Join Date: Apr 2000 Location: Colorado, USA Posts: 1,095	My guess is you got a chunk of dirt or teflon thread tape in the fuel line when you put in the electric pump. Either that, or too much fuel pressure like the others are saying. You might want to try a fuel pressure regulator up by the carb. I had the same prob once and it really sucks driving with one hand up under the dash, connecting and disconnecting the inline fuse to get the rest of the way home without flooding! That was when I put a switch in the fuel pump wire and a regulator under the hood. Never had to use the switch though, except to keep thieves from getting very far... It was kind of funny when the guy who bought the truck only made it half a block away and came walking back to my house with a "what the hell did I buy?" look on his face! __________________ 1971 GMC 2500, 402/TH400 4.10 Daily Driver Lafayette, CO

08-21-2002, 05:32 PM	#9
Twilightoptics Registered User Join Date: Apr 2002 Location: Vancouver, WA. USA Posts: 38	It was a piece of metal stuck in the needle housing. Carb man fixed her up no charge. Whew. __________________ http://4.65.252.68/hosted/twilightsig.jpg 1967 Chevy Pickup: '85 Camaro 305 Rebuilt carb - Turbo 400 Trans Flowtech headers to Purple Hornies



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