Fuel dumping w/ Edelbrock 1406 - Team Camaro Tech
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post #1 of 22 (permalink) Old Sep 6th, 07, 08:05 PM Thread Starter
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Unhappy Fuel dumping w/ Edelbrock 1406

My 69 w/ a more or less stock 350 has what appears to be fuel dumping. When it's been driven for a while and I shut it off and come back to start it in 30 min.....It won't idle, smells like gas and stalls. It eventually settles down after holding RPMs up for about 5 min. Engine temp never gets above 190, so heat soak doesn't seem to be it.
It has a new Edelbrock 1406 carb with the heat insulator under it on a performer EPS manifold. Plugs are new and are not fouling, timing is 12 deg advance at 750 rpm. New AC Delco stock style fuel pump. In line Russell filter.

The carb has been tuned for my altitude in Denver (about 6000 ft at my place) by jetting down 2 steps and rod changes - according to the tuning guide. I checked and double checked the floats... all is to spec. I've even tried to lower the floats a bit, cleaned out the idle ports, made sure there's no vacuum leaks but it's still doing this..

What might be causing this? What's next in working out a solution?.... pressure regulator? Trash the Eddy for a Holley? Is the still a problem with Holleys?

I know others have worked through this.... please help!
Thanks
Bob

69 Camaro
Le Mans Blue Coupe, 350 GMPP/HO with FAST EZ EFI, TH350
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post #2 of 22 (permalink) Old Sep 6th, 07, 08:11 PM
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Re: Fuel dumping w/ Edelbrock 1406

mine did the same thing. just add a 1/2" spacer under it and the problem will be cured

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post #3 of 22 (permalink) Old Sep 6th, 07, 10:20 PM
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Re: Fuel dumping w/ Edelbrock 1406

Sounds like you have the same problem as I do. I have same set up except I have a edelbrock manifild. I drive it around, come back home park it and it smells of fuel. i lift off the air cleaner and I can see fuel pooling in the carb. Anyway, I e-mailed edelbrock. The guy with the 30 pound head says that the stock fuel pump is putting out to much pressure. So i bought the Summit pressure regulator and am now waiting for my plumbing fittings to get here. Once I get it all plumbed i'll let you know.

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post #4 of 22 (permalink) Old Sep 6th, 07, 11:01 PM
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Re: Fuel dumping w/ Edelbrock 1406

I had the same problem!

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post #5 of 22 (permalink) Old Sep 7th, 07, 12:32 AM
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Re: Fuel dumping w/ Edelbrock 1406

I had the same problem, and found that the plugs in the bottom of my carb (Edelbrock 600) were leaking, causing the problem in my case. I put some epoxy over them, problem solved!

Good Luck!

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post #6 of 22 (permalink) Old Sep 7th, 07, 06:27 AM
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Re: Fuel dumping w/ Edelbrock 1406

What's your fuel pressure? If your not running a stock fuel pump you most likely need a fuel pressure regulator. I have mine set at 5.5 psi and my 69 camaro runs great with the 1406. The manual says anything over 6psi is too much so i set mine at 5.5 to be on the safe side.

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post #7 of 22 (permalink) Old Sep 7th, 07, 09:20 AM Thread Starter
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Re: Fuel dumping w/ Edelbrock 1406

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Originally Posted by DenRS View Post
What's your fuel pressure? If your not running a stock fuel pump you most likely need a fuel pressure regulator. I have mine set at 5.5 psi and my 69 camaro runs great with the 1406. The manual says anything over 6psi is too much so i set mine at 5.5 to be on the safe side.
I don't know what the fuel pressure is, but the pump is an AC Delco stock-style pump (got it from Ricks 1st gen). Doesn't seem like it should run more than 6 psi, but I just can't say for sure.

How much of a pain is it to put in a regulator? Are there pumps that do a better job of regulating psi that's a cleaner solution than an external regulator?

Bob

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post #8 of 22 (permalink) Old Sep 7th, 07, 09:22 AM
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Re: Fuel dumping w/ Edelbrock 1406

Do you really need a pressure regulator with a stock fuel pump?......
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post #9 of 22 (permalink) Old Sep 7th, 07, 09:31 AM
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Re: Fuel dumping w/ Edelbrock 1406

Yes. I have one of them and even with the stock pump I had to install the regulater. This is one of many issues that make me prefer Holley carbs.
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post #10 of 22 (permalink) Old Sep 7th, 07, 09:41 AM
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Re: Fuel dumping w/ Edelbrock 1406

So the stock delco pump puts out more the 5.5 and therefore needs regulated in order to properly feed the 1406?
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post #11 of 22 (permalink) Old Sep 7th, 07, 09:44 AM Thread Starter
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Re: Fuel dumping w/ Edelbrock 1406

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Originally Posted by deerhunter View Post
Yes. I have one of them and even with the stock pump I had to install the regulater. This is one of many issues that make me prefer Holley carbs.
Which Holley is a good replacement for the Eddy 1406. Street application.

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post #12 of 22 (permalink) Old Sep 7th, 07, 10:54 AM Thread Starter
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Re: Fuel dumping w/ Edelbrock 1406

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Originally Posted by Brentmc View Post
So the stock delco pump puts out more the 5.5 and therefore needs regulated in order to properly feed the 1406?
I have a theory... I'm at 6000 ft in elevation. The air pressure here is 25% less than at sea level. So... wouldn't a pump that produces 6 PSI at sea level produce 25% more pressure (from less atmospheric resistance) at 6000 ft? That would be 7.5 PSI... and enough to cause the problems I'm seeing.

What do you think?

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post #13 of 22 (permalink) Old Sep 7th, 07, 11:22 AM
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Re: Fuel dumping w/ Edelbrock 1406

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Originally Posted by boboftherockies View Post
I have a theory... I'm at 6000 ft in elevation. The air pressure here is 25% less than at sea level. So... wouldn't a pump that produces 6 PSI at sea level produce 25% more pressure (from less atmospheric resistance) at 6000 ft? That would be 7.5 PSI... and enough to cause the problems I'm seeing.

What do you think?
Pressure of a liquid is hardly affected by the atmospheric air pressure at all. We are just went over this in my fluids class. The atmoshperic pressure does have a huge affect on fuel mixture but you seem to have that sorted out. I can't get my engine to start with my new Edelbrock, I guess I will try with a regulator.

Chris

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post #14 of 22 (permalink) Old Sep 7th, 07, 01:51 PM
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Re: Fuel dumping w/ Edelbrock 1406

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Originally Posted by boboftherockies View Post
Which Holley is a good replacement for the Eddy 1406. Street application.
I used the 670 Street Avenger and right out of the box it worked fine.
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post #15 of 22 (permalink) Old Sep 7th, 07, 02:13 PM
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Re: Fuel dumping w/ Edelbrock 1406

PSIG is gauge pressure.

PSIA is Absolute pressure, or gauge + atmospheric

6PSIG at sea level is about 20.7 PSIA
6 PSIG at higher elevations is less. I work at 3000' a lot and we use 13 for atmospheric. So 19 PSIA, and in Denver it would be about a pound less.

But The 6 PSI is relative to the geometric advantage of the particular float and needle/seat. Atmospheric doesn't come into play here.

Bob didn't you have another thread with the same problem? Or am I confused between posts again

My 2 cents

edit: by the way gauges have to be calibrated for altitude. Cheapo gauges don't have that capability.

Tim Smith
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