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post #1 of (permalink) Old 05-31-2004, 06:43 PM Thread Starter
 
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Fuel pump SBC

Just setup my cooling system so I wanted to run my jeep up to operating temperature.

I've got a feeling the fuel pump is hooped.

Symptoms:

No fuel in filter when I crank..
(I've got a 3 port carter pump on my SBC.. ones in, ones out, and ones return.)

When I stuck the electric pump on the rail to see if it just needed the carb floats to fill, it pumped through the fuelpump.. but the fuel dissapeard..

Does this mean I diaphram is cooked and I just pumped a couple of gallons of fuel into my oil? [img]images/graemlins/laugh.gif[/img]

Figured it was a good time to add the oil flush stuff and do that. So I did..

It runs right now iwth the electrical pump bypassing the mech.

I don't know much about mechanical pumps... so any info is appericated.

Can I get just a diaphram for this or do I have to get a whole new pump?
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post #2 of (permalink) Old 05-31-2004, 10:09 PM
 
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Re: Fuel pump SBC

If you're already running with an electric pump, why don't you stick with it. Just get/manufacture a cover for the pump hole on the block and leave it be. If you want to stick with the mechanical pump, yes it sounds like you diaphragm is hosed. It could have either gone into your engine or could have gone back through the return.

I would definitely recommend staying with the electric pump since it's already set up.

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post #3 of (permalink) Old 05-31-2004, 10:28 PM Thread Starter
 
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Re: Fuel pump SBC

I want the elecrtic as a backup.

I want to go propane, but that's not SOON SOON.

Called NAPA..

THIS IS WHY I SWAPPED IN A SBC.
I priced a 4.2L pump when that one went.

$85
So I got the electrical pump.
$75

SBC pump. $28

Now's when it starts paying for itself. [img]images/graemlins/grin.gif[/img]
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post #4 of (permalink) Old 06-01-2004, 04:54 AM
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Re: Fuel pump SBC

[img]images/graemlins/tongue.gif[/img] I'm suspectin' that you have the fuel pump connected wrong. I think that you may have the in-out-bypass lines mixed up. [img]images/graemlins/tongue.gif[/img] Check that first before you change the crankshaft. [img]images/graemlins/crazy.gif[/img] When I looked at the photo of your engine the other day, the fuel pump setup did not look quite right for reasons which I cannot quite put my finger on........it just looked strange. [img]images/graemlins/crazy.gif[/img]
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post #5 of (permalink) Old 06-01-2004, 10:23 AM Thread Starter
 
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Re: Fuel pump SBC

Its got 3 ports.

Threaded -> To Carb
Big Flare -> From Tank
Small Flare -> Return

I suppose I could have it all backwards.. but that's the way it was hooked up when I got it.

There was a hardline from the threaded port up to the threaded carb port.
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post #6 of (permalink) Old 06-01-2004, 07:34 PM Thread Starter
 
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Re: Fuel pump SBC

Done.

Replaced the fuelpump..

$28.

I love my Chevy. [img]images/graemlins/grin.gif[/img]

Now.. I'm crossing my fingers that my rear driveshaft I just shortened will work.. I suppose its just bum luck if I got it all setup accurately enough to not vibrate.. if not, I have to mail it out to a friend for some work. [img]images/graemlins/laugh.gif[/img]
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