Hard start sometimes? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

79Silv4x4 · 12-31-2002, 05:57 PM

I put a 1406 on my truck seveal months ago and it runs great with one exception. Cold start it does fine and sometimes it starts great after I have driven it for a while. Other times when I shut it off I detect a gas smell and if I just kill it for a second, like to run into a store, and try to restart it will crank forever before it runs. Other times I get no gas smell and it busts right off. I do have an electric inline fuel pump on this truck and was wondering if it might still be pumping fuel to the carb and flooding it. Any other ideas?

**swervin ervin** · 12-31-2002, 07:12 PM

Sounds like your problem may be related to the electric fuel pump. Do you know how much pressure it's putting out? A carb only needs 4 or 5 psi. If the pump is overpowering the needle and seat, your engine is getting flooded. Not a good thing for sure. Buy a regulator and pressure gauge. Don't guess with things like this.

79Silv4x4 · 12-31-2002, 07:55 PM

Mike, I have an inline regulator set to 4 psi but I suppose it could be faulty? The PO swapped in a '90 TBI pickup motor but used a carb instead of the electronics. I'm considering changing back to a mechanical pump just be safe.

85Silverado · 12-31-2002, 10:43 PM

If it is getting flooded when it cranks forever and won't start....try holding the pedal to the floor while cranking...don't pump it...just hold it to the floor....this worked well on the cars I've had that got flooded.

12-31-2002, 05:57 PM	#1
79Silv4x4 Workaholic Join Date: Oct 2002 Location: Katy, TX Posts: 1,589	Hard start sometimes? I put a 1406 on my truck seveal months ago and it runs great with one exception. Cold start it does fine and sometimes it starts great after I have driven it for a while. Other times when I shut it off I detect a gas smell and if I just kill it for a second, like to run into a store, and try to restart it will crank forever before it runs. Other times I get no gas smell and it busts right off. I do have an electric inline fuel pump on this truck and was wondering if it might still be pumping fuel to the carb and flooding it. Any other ideas? __________________ 1979 K-10 Silverado (work in progress) 1991 V1500 Subruban 1999 Suburban LT 4x4 2006 Suburban LTZ (daily driver)

12-31-2002, 07:12 PM	#2
swervin ervin You get what you pay for Join Date: Dec 1999 Location: Cherryville, NC Posts: 4,798	Sounds like your problem may be related to the electric fuel pump. Do you know how much pressure it's putting out? A carb only needs 4 or 5 psi. If the pump is overpowering the needle and seat, your engine is getting flooded. Not a good thing for sure. Buy a regulator and pressure gauge. Don't guess with things like this. __________________ Mike 1985 Chevy C-10

12-31-2002, 07:55 PM	#3
79Silv4x4 Workaholic Join Date: Oct 2002 Location: Katy, TX Posts: 1,589	Mike, I have an inline regulator set to 4 psi but I suppose it could be faulty? The PO swapped in a '90 TBI pickup motor but used a carb instead of the electronics. I'm considering changing back to a mechanical pump just be safe. __________________ 1979 K-10 Silverado (work in progress) 1991 V1500 Subruban 1999 Suburban LT 4x4 2006 Suburban LTZ (daily driver)

12-31-2002, 10:43 PM	#4
85Silverado Registered User Join Date: Dec 2002 Location: Milwaukee, Wisconsin Posts: 198	If it is getting flooded when it cranks forever and won't start....try holding the pedal to the floor while cranking...don't pump it...just hold it to the floor....this worked well on the cars I've had that got flooded. __________________ Paul D. '78 C20 Scottsdale 350ci 3 speed with granny gear 14 bolt rearend My trucks are "Car-Guy safe".......which pretty much means death trap in the hands of a normal civilian.

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