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Re: mechanical fuel pump...adjusting pressure question
Posted by: MattNall ()
Date: February 23, 2012 12:27AM

corvairunderground Wrote:
-------------------------------------------------------
> Can someone explain
> to me how a fuel pump that is designed to stop
> pumping when it gets resistance can put out "too
> much pressure"?
=================================================

[en.wikipedia.org]

Thought you would've read this by now!! gg





MODERATOR
Somewhere between Sea Mountain and Coos Bay! SW Oregon Coast
Click HERE for My Website...Click HERE for My TechPages!
.............................PG...................................Turbo

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Re: mechanical fuel pump...adjusting pressure question
Posted by: flamingchariots ()
Date: February 23, 2012 02:42AM

Quote
corvairunderground
Fix the REAL problem and stop destroying your springs...

Agreed!

Kevin
Medina, OH

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Re: mechanical fuel pump...adjusting pressure question
Posted by: MattNall ()
Date: February 23, 2012 02:54AM

Kevin.. if Greg has 7 psi... that IS his first REAL PROBLEM.

And with rising fuel prices... as ScottV stated earlier

"too much fuel pressure can cause a too high fuel level in the carb - that can cause the cluster to leak fuel.

-Scott V."

This equates to lower fuel mileage.... and Greg lives at least 50 miles from his chapter's normal meeting place!





MODERATOR
Somewhere between Sea Mountain and Coos Bay! SW Oregon Coast
Click HERE for My Website...Click HERE for My TechPages!
.............................PG...................................Turbo

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Re: mechanical fuel pump...adjusting pressure question
Posted by: flamingchariots ()
Date: February 23, 2012 03:00AM

Yes, Matt.

I agree...
But IMO, wouldn't it be simpler to just install a fuel pressure regulator?
Then you don't guess on springs taking them apart multiple times, or destroy them when you cut too much off.

Kevin
Medina, OH

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Re: mechanical fuel pump...adjusting pressure question
Posted by: MattNall ()
Date: February 23, 2012 03:31AM

True.. but everyone needs to learn sometime! So that someday... on a long trip.. and you just installed that new pump from who knows.. and your carbs start flooding...

Not everyone buys their pumps from LON.....





MODERATOR
Somewhere between Sea Mountain and Coos Bay! SW Oregon Coast
Click HERE for My Website...Click HERE for My TechPages!
.............................PG...................................Turbo

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Re: mechanical fuel pump...adjusting pressure question
Date: February 23, 2012 08:34AM

Thanks Matt - I guess I should be happy.........BUT, I think some folks don't understand how a Corvair mechanical fuel pump actually works. It seems like we have to constantly complicate the issue by overthinking it.

I have seen mechanical fuel pumps, drop thier valves, or leak, but I've never seen one pump "too much gas". Again I ask, why are the venturis leaking? (And in fact, is that actually what's happening in the first place.)

Nearly 2 million Corvair miles since 1967 and all but a small number on mechanical pumps. Why do some other people come up with these odd fuel pump problems that I have never seen?

Is Underground the only place in the world where you can buy fuel pumps that work? I ought to be happy with that assumption - but I think that is a ridiculous claim for me to make.

Lon
www.corvairunderground.com

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Re: mechanical fuel pump...adjusting pressure question
Posted by: ccvair ()
Date: February 23, 2012 09:09AM

Ok well heres a question,How much pressure can the needle and seat see before it can leak past it? I remember a few years back I bought a pair of carb kits that were made by standard, and I never could get the carbs to stop dribbling and or flooding.The cause? The replacement seat assemblys were too short! Ended up using the old seat and needles problem solved!

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Re: mechanical fuel pump...adjusting pressure question
Posted by: Layton Curtis ()
Date: February 23, 2012 01:30PM

After 300 thousand miles or so, over 45 years, I have not had the high pressure fuel pump problems described here. Pumps work here in Kentucky just like they do in Oregon I guess.

However, if I ever do have a problem I will experiment with a 1/8" needle valve at the pump outlet, because in the glass industry it is very important to have constant flow/pressure to the glass furnace at all times. We found that we could do that with a needle valve 95% of the time. Stop valves, gate valves ect are useless for that purpose but not needle valves.

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Re: mechanical fuel pump...adjusting pressure question
Posted by: azdave ()
Date: February 23, 2012 01:50PM

corvairunderground Wrote:
----------------------------------
>It seems like we have to constantly complicate the issue by overthinking it.

What? Is this your first day on Corvair Center? This is the place where problems are constantly "overthunk" and complicated beyond logic.

grinning smiley

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Re: mechanical fuel pump...adjusting pressure question
Posted by: Gregory_Miller ()
Date: February 23, 2012 04:43PM

azdave Wrote:
-------------------------------------------------------
> corvairunderground Wrote:
> ----------------------------------
> >It seems like we have to constantly complicate
> the issue by overthinking it.
>
> What? Is this your first day on Corvair Center?
> This is the place where problems are constantly
> "overthunk" and complicated beyond logic.
>
> grinning smiley
Amen, brother!! I overthink stuff all the time.

Greg Miller
Eugene, Oregon

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Re: mechanical fuel pump...adjusting pressure question
Date: February 23, 2012 09:15PM

Ok, I give in, The internet IS the place to overcomplicate everything. Now back to work as I have a life!

Lon
www.corvairunderground.com

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