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Old 07-14-2013, 12:36 PM
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Fuel check valve?

Hey Guys, I have a 67 El Camino with a SBC 350, Edelbrock carb, headers, lumpy cam, etc. The car runs great. It is not a daily driver, it will sit days to weeks at a time. The car fires right up when it is driven daily. Here is my question, when the car sits for longer than a week, it will take about 30 seconds of cranking for it to start. Is it possible with these cars to install a one way fuel check valve in the fuel line? Will it hurt anything?

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Old 07-14-2013, 01:31 PM
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Fuel in the bowl cannot flow uphill past the needle and seat. The fuel loss you're experiencing is likely evaporation out the vent due to high alcohol content in the fuel or a leak, allowing fuel to dribble out of the bowl and into the intake manifold.

In the past, I have rigged up a low-cost electric fuel pump on a separate electrical circuit, using a momentary push-button switch, to top off the bowl(s) before lighting up the starter.
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Old 07-14-2013, 01:42 PM
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Max I have the same issue on (4) cars with a variety of carbs: (2) Holley's a Quadrajet and an Edlebrock. A buddy of mine added an electric fuel pump (as Tech Inspector mentioned above) and it worked quite well.

For me I just let them crank till the mech. pump fills the bowls.
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Old 07-14-2013, 01:49 PM
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Originally Posted by lakeroadster View Post
For me I just let them crank till the mech. pump fills the bowls.
Problem with this approach is that the cam is getting no splash lube all the time the starter is being ground on. This will likely spell death for flat tappets after a while.
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Old 07-14-2013, 02:05 PM
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I have heard other folks say that also.

If I combine how long I have owned the 4 cars I mentioned above I have about 20 years of history starting them this way, all without a problem.

The Valvoline VR1 oil that I use no doubt helps...
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Old 07-14-2013, 02:49 PM
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Quote:
Originally Posted by lakeroadster View Post
I have heard other folks say that also.

If I combine how long I have owned the 4 cars I mentioned above I have about 20 years of history starting them this way, all without a problem.

The Valvoline VR1 oil that I use no doubt helps...
Same here, I use VR1 as well. So I have an option of wiring in an electric fuel pump for the long periods of sitting, what about a check valve in the fuel line near the tank to help keep the fuel trapped there for the extended periods of sitting?
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Old 07-14-2013, 02:57 PM
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It's not leaking back down the fuel line, it's evaporating out of the carb. Not much you can do. If you can find "non-ethanol" fuel it will help.
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Old 07-14-2013, 03:13 PM
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Originally Posted by lakeroadster View Post
It's not leaking back down the fuel line, it's evaporatingar out of the carb. Not much you can do. If you can find "non-ethanol" fuel it will help.
Ok, we'll that makes sense. I found electric fuel pumps at summit racing for $35 -$50 which would appear perfect for this problem. They show 4-7 psi of pressure. Would I need a pressure regulator? Would this be installed near the tank, I presume I can keep the mechanicle fuel pump?
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Old 07-14-2013, 03:24 PM
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Yes to the regulator.... or bad things will likely come your way and yes to keeping the mechanical... but there's more to the story. Here is a link to my buddys build thread. He installed the "carb. priming extra electric fuel pump" and did an excellent write up, start at post #478 on page 20. Markeb01 Build Thread - Page 20 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

A smart man learns from his own mistakes, but a wise man learns from the mistakes of others....
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Old 07-14-2013, 03:41 PM
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Originally Posted by lakeroadster View Post
Yes to the regulator.... or bad things will likely come your way and yes to keeping the mechanical... but there's more to the story. Here is a link to my buddys build thread. He installed the "carb. priming extra electric fuel pump" and did an excellent write up, start at post #478 on page 20. Markeb01 Build Thread - Page 20 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

A smart man learns from his own mistakes, but a wise man learns from the mistakes of others....
Thanks for the link, that was very helpful....
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Old 07-14-2013, 06:15 PM
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Quote:
Originally Posted by techinspector1 View Post
Fuel in the bowl cannot flow uphill past the needle and seat. The fuel loss you're experiencing is likely evaporation out the vent due to high alcohol content in the fuel or a leak, allowing fuel to dribble out of the bowl and into the intake manifold.

In the past, I have rigged up a low-cost electric fuel pump on a separate electrical circuit, using a momentary push-button switch, to top off the bowl(s) before lighting up the starter.
Can you recommend an electric fuel pump that will work with the stock mechanical pump? I found a few on Summit racing that were in the $40-$60 range.
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Old 11-19-2013, 10:30 PM
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hi. i thought i posted about this same thing but i couldn't find it. anyway on the cherokee forum i found a thread on this same thing. for me its that stupid *** Edelbrock carb i wish i'd never bought. but some have the same prob with other carbs. go figure. never had it with my holley.

go to wwwbmaparts.com and ask for BMW part number 16149068988 and it will come up with one for a 3/8" fuel line for $14. i thought i looked but it must not have been too good cause all i did this time was google check valve and viola!

just don't buy one tomorrow cause that's when i'm gettin mine. shipping should be another $3-5. hope this fixes my issue as it killed my last battery.
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Old 11-20-2013, 12:40 PM
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well great. i cant edit my above post. wtf is going on around here?

anyway, got an email from bma which said, TOUGH STUFF, we no longer have that part available. however i did get this:
'
You could buy one of our U600 series brass check valves and either put on the barbs yourself or I could quote it complete. If you want to go with smallest/cheapest available, would be the U613-2-2PP. Valve is $11.05 plus shipping. Or let me know if you want complete with barbs.
Valve Check, Inc

NOTICE that this is not bma.com but Valve Check, Inc peace out home fries.
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