fuel issues ??

jarhead2001 · 04-08-2008, 05:39 AM

I think I might have some fuel issues. I have 12 psi of fuel pressure, the plugs show that there is a lean condition across the board. I replaced the intake gasket and the tbi gasket because of a low vac reading ( I am asuming from to much cam) the truck runs great finaly will out run a vortec v6 0-55mph (first run was before replacing MAP, egr, o2, plugs&wires, Cap&rotor, IAC, and rebuilt the TBI.

my main problem is the stumbling and stalling as well as when i test the fuel pressure it dose not hold any pressure. I had to have the motor running inorder to get a reading.

this is on a 92 2500 350 auto.
cam specs unknown 15in. hg. vac reading warm in Netural.

thanks Justin

03chevy · 04-08-2008, 06:18 AM

did you rebuild the motor or something? and did you you put a much bigger cam in it to try and gain extra hp? if so then you need more fuel. a bigger cam requires more fuel and more spark and retard timing.

crabtruck · 04-08-2008, 04:26 PM

doesn't that fuel system bleed itself down by design with eng off? That's what I understood.

o3shortbed · 04-09-2008, 12:17 AM

Quote:

Originally Posted by crabtruck

doesn't that fuel system bleed itself down by design with eng off? That's what I understood.

i though that too

03chevy · 04-09-2008, 06:50 AM

yes it does. but if you are running lean and low vac. did you change the injectors with the bigger cam?? and add a vac canister to help with the vac system. so what i'm saying is you can not change one thing and get it to work proper with out changing anything else

04-08-2008, 05:39 AM	#1
jarhead2001 Full Member Join Date: Mar 2008 Posts: 28	fuel issues ?? I think I might have some fuel issues. I have 12 psi of fuel pressure, the plugs show that there is a lean condition across the board. I replaced the intake gasket and the tbi gasket because of a low vac reading ( I am asuming from to much cam) the truck runs great finaly will out run a vortec v6 0-55mph (first run was before replacing MAP, egr, o2, plugs&wires, Cap&rotor, IAC, and rebuilt the TBI. my main problem is the stumbling and stalling as well as when i test the fuel pressure it dose not hold any pressure. I had to have the motor running inorder to get a reading. this is on a 92 2500 350 auto. cam specs unknown 15in. hg. vac reading warm in Netural. thanks Justin

04-08-2008, 06:18 AM	#2
03chevy Senior Member Join Date: Dec 2006 Location: jax,fl Posts: 1,195	did you rebuild the motor or something? and did you you put a much bigger cam in it to try and gain extra hp? if so then you need more fuel. a bigger cam requires more fuel and more spark and retard timing. __________________ A dirty mind is a terrible thing to waste!

04-09-2008, 06:50 AM	#5
03chevy Senior Member Join Date: Dec 2006 Location: jax,fl Posts: 1,195	yes it does. but if you are running lean and low vac. did you change the injectors with the bigger cam?? and add a vac canister to help with the vac system. so what i'm saying is you can not change one thing and get it to work proper with out changing anything else __________________ A dirty mind is a terrible thing to waste!

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04-08-2008, 04:26 PM	#3
crabtruck Senior Member Join Date: Jul 2007 Posts: 4,079	doesn't that fuel system bleed itself down by design with eng off? That's what I understood.