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#81508 08/15/2007 2:10 PM | Joined: Feb 2007 Posts: 385 Wrench Fetcher | | Wrench Fetcher Joined: Feb 2007 Posts: 385 | I've read that the older truck carburetors are sensitive to fuel pressure. I've got a truck that starts, but won't idle. Seems to be getting all it's fuel from the accelerator pump. I want to replace the fuel pump first. Actually, I'm going to be bypassing most of the original fuel system, with a Briggs and Stratton tank on the front fender and new rubber tubing, through a filter, down to the fuel pump inlet.
Now that I've explained all that, the real question is whether a replacement fuel pump might actually be in the 3 to 3.5 psi range without a regulator. I can't seem to find any regulators at all that cost less than $30.
195? Chevy 3800 dump truck
1973 Chevy C30 cab and chassis
1987 Suburban 3/4 ton 6.2L Diesel
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#81509 08/15/2007 3:04 PM | Joined: May 2005 Posts: 8,878 . | | . Joined: May 2005 Posts: 8,878 | If you get a replacement original pump you will be fine, no regulator needed.
If you want to eliminate your current fuel pump as the problem place your temporary fuel tank about a foot or more above the carb, it should run fine if that was the problem.
I am leaning toward a carb cleaning and rebuild, what you describe does not sound like a fuel pump problem.
Grigg | | |
#81510 08/16/2007 12:53 PM | Joined: Feb 2007 Posts: 385 Wrench Fetcher | | Wrench Fetcher Joined: Feb 2007 Posts: 385 | Thanks, Grigg. I was kind of wondering. It doesn't appear to be the original carburetor, for one thing, and it isn't all there for another, but as long as I kept pumping the accelerator it would run.
I have two Rochester Bs laying around, one freshly rebuilt. I guess I'll just pop one on and get rid of that other carb, which I hadn't planned on keeping anyway.
I can hang the Briggs and Stratton tank from the inside of the hood until I figure out where the real problem is.
195? Chevy 3800 dump truck
1973 Chevy C30 cab and chassis
1987 Suburban 3/4 ton 6.2L Diesel
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#81511 09/16/2007 1:55 PM | Joined: Feb 2007 Posts: 385 Wrench Fetcher | | Wrench Fetcher Joined: Feb 2007 Posts: 385 | Update: I hung the Briggs and Stratton tank and it didn't run any better.
Pulled that carburetor and found out it is a Rochester Monojet (?)
Put on my fresh rebuilt Rochester B and got it to run, and idle, but the fan belt broke. That's turning into another story.
I had a hose run from the fuel pump outlet to a bucket on the front bumper to see if the fuel pump worked. After running for three to four minutes there was maybe a tablespoon in the bucket.
What's the best way to clean out the old 'behind the seat' tank? I've got a rebuilt fuel pump for it and will probably run it with rubber fuel lines for a little while. It isn't going far with no brakes, five tires and no charging system.
195? Chevy 3800 dump truck
1973 Chevy C30 cab and chassis
1987 Suburban 3/4 ton 6.2L Diesel
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#81512 09/16/2007 5:25 PM | Joined: Mar 2002 Posts: 9,115 'Bolter | | 'Bolter Joined: Mar 2002 Posts: 9,115 | Man that Rochester gave you so much torque it broke the fanbelt!
There are threads about cleaning the tank. That is a big subject! | | |
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