Carb or fuel pump problem?
#1
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Car: '72 Chevy Nova
Engine: Solid roller 355
Transmission: TH350
Axle/Gears: 8.5" 10-bolt 3.73 Posi
Carb or fuel pump problem?
Having played with mostly fuel injection, I've got a quick question about a problem with my new ride.
I'm running an Edelbrock 4-barrel 600 CFM carb (pretty sure it's the 1406) on top of my 350, along with an inline electric fuel pump. Both are brand new (less than 500 miles). I bought the car like this.
No problems at first then this happened last night. Sounds like a fuel pump problem to me but not having much experience with carbs I figured I'd ask.
When driving it'll start to stumble and bog down badly, then catch it's breath for a second and run fine then stumble badly again. It'll do this for about 30 seconds then just bog down and refuse to recover until I come to a stop at which point it'll just die. If I keep driving it won't go over 10mph and it'll just die eventually anyway.
I can sit there for 30 seconds, with the fuel pump priming, and it'll start right back up and run for a champ for a few minutes and do the same thing again.
Sounds to me like the brand new fuel pump was bad out of the box but wasn't sure if it was a carb issue possibly?
I'm running an Edelbrock 4-barrel 600 CFM carb (pretty sure it's the 1406) on top of my 350, along with an inline electric fuel pump. Both are brand new (less than 500 miles). I bought the car like this.
No problems at first then this happened last night. Sounds like a fuel pump problem to me but not having much experience with carbs I figured I'd ask.
When driving it'll start to stumble and bog down badly, then catch it's breath for a second and run fine then stumble badly again. It'll do this for about 30 seconds then just bog down and refuse to recover until I come to a stop at which point it'll just die. If I keep driving it won't go over 10mph and it'll just die eventually anyway.
I can sit there for 30 seconds, with the fuel pump priming, and it'll start right back up and run for a champ for a few minutes and do the same thing again.
Sounds to me like the brand new fuel pump was bad out of the box but wasn't sure if it was a carb issue possibly?
Last edited by urbanhunter44; 02-23-2008 at 11:54 AM.
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Car: '89 Firebird
Engine: 305 TBI (LO3)
Transmission: 700R4
Axle/Gears: 10 bolts 2.73
Re: Carb or fuel pump problem?
Just to be sure , you should rent a fuel pressure gauge . Now , between the inline fuel pump and the carburetor , you must have a fuel pressure regulator . Check the fuel pressure , when priming , before the regulator and after the regulator . Pressure should be higher on the fuel pump side has you've guessed . On the carb side pressure should be between 1 and 5 psi max .
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Car: 1984 Z28 Hardtop
Engine: 383 Carb
Transmission: 4L60
Axle/Gears: 3.54 Dana 44
Re: Carb or fuel pump problem?
What pump are you using, and what do you have for a pickup in the tank?
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Car: '72 Chevy Nova
Engine: Solid roller 355
Transmission: TH350
Axle/Gears: 8.5" 10-bolt 3.73 Posi
Re: Carb or fuel pump problem?
I don't know what the previous owner used as a pickup.
I'll double check on the pump model when I get home.
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Car: '72 Chevy Nova
Engine: Solid roller 355
Transmission: TH350
Axle/Gears: 8.5" 10-bolt 3.73 Posi
Re: Carb or fuel pump problem?
They're near the passenger's side header and the headers are uncoated so that's possible, I'll try moving them away from that source of heat.
Edit: Now that I'm home and looking at them it appears they're decently far away to rule that out.
Last edited by urbanhunter44; 02-23-2008 at 04:50 PM.
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