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Clark's Mechanical fuel pumps?
Posted by: firevair66 ()
Date: June 11, 2017 10:30AM

Just wondering if they are up to spec. now.

John Shoemaker,Riegelsville,PA.
1958 Impala Sport Cp. 348 ,pg/ac
61 Rampside full custom show truck
65 Monza 110/4 vert driver
65 Full Custom Monza 140 Cp
66 Monza 110/PG Vert
66 Corsa FITCH SPRINT Documented ( in Process,recondition)
66 CorV8 350 "firevair"Custom Show







Edited 1 time(s). Last edit at 06/11/2017 11:43AM by MattNall.

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Re: clarks fuel pump OK now?
Posted by: MattNall ()
Date: June 11, 2017 10:39AM

Fresh shipment.... time will tell. Never knew they had a problem!





MODERATOR
Sea Mountain, between Charleston Harbor and Coos Bay! SW Oregon Coast
Click HERE for My Website...Click HERE for My TechPages!
..............................110-PG.................................................Webered-Turbo

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Re: clarks fuel pump OK now?
Posted by: Timothy Shortle ()
Date: June 11, 2017 10:40AM

I never had a problem with their fuel pumps and I have bought a few over the years.

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Re: clarks fuel pump OK now?
Posted by: firevair66 ()
Date: June 11, 2017 10:56AM

Thanks for the input

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Re: Clark's Mechanical fuel pumps?
Posted by: curt ()
Date: June 11, 2017 05:31PM

I have been running a Clarks Fuel pump close to 900 miles; ordered it about 2 months ago. So far, I have zero complaints.
1969 Monza.
95HP, PG,

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Re: Clark's Mechanical fuel pumps?
Posted by: gnvair ()
Date: June 11, 2017 06:01PM

The pump that is on my turbo engine was from Clark's in 2009 and it had 8lbs of fuel pressure out of the box. I had to do the spring modifications.
Other than that it was fine.

Lee J

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Re: Clark's Mechanical fuel pumps?
Posted by: Ratt643 ()
Date: June 12, 2017 06:22AM

The high fuel pressure was the issue I had with Clark's fuel pumps.


1964 Monza Coupe

Maryville, TN
U.S. 129 The"Tail Of The Dragon"

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Re: Clark's Mechanical fuel pumps?
Posted by: cnicol ()
Date: June 12, 2017 07:21AM

This weekend I installed an electric pump in one of my clubbie's cars.

Why? The three-year old mechanical pump failed and filled the crankcase with gasoline. He smelled fuel and checked out the engine for fuel leaks and found none so he drove home. By the time he got home there was oil coming out of the engine in 29 places and the entire engine compartment was covered in slime. The dipstick didn't register at all because the oil was so diluted with gas.

The 140 in this '66 Corsa convertible was rebuilt by me about three years ago to the tune of about $4500. Putting that rebuild at great risk just to be able to say you have a mechanical pump simply isn't worth it.

Now it has a silent electric pump and a nice little aluminum plug were the pump used to be.

Craig N. Coeur d'Alene ID.
66 Black Monza 4dr, 4.2L V8 49k
61 Seamist Jade Rampside 140 PG
60 Monza coupe (sold, sniff sniff)
66 Sprint Corsa convt - First car! Re-purchased 43 years later

+17 Tons of parts

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Re: Clark's Mechanical fuel pumps?
Posted by: Timothy Shortle ()
Date: June 12, 2017 07:45AM

"OWE"! I don't like to hear that Craig. I had a mechanical pump do that on my 63 Rampside about 35 years ago. My symptom was the engine started smoking quickly, excessively out the tail pipe. I thought I fried a piston but in the back of my mind I knew I wasn't pushing her. Then I checked the oil level AND IT WAS WAYYYYY OVERFILLED. I thought I had struck oil. Also I had a very strong odor of gasoline.
I drained the oil immediately. You should have seen how fast it came out of the crankcase. Then it dawned on me what was happening. I changed to an electric fuel pump shortly thereafter. But my confidence has returned on the mechanical pumps (until I read your post). Now I'm scared again. Or rather cautious.

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Re: Clark's Mechanical fuel pumps?
Posted by: corventure Dave ()
Date: June 15, 2017 08:08AM

General maintenance.... I check my oil often. If I'm making oil... it's time to check the fuel pump. It's either that or if the vehicle is parked with the front high and the float valve is leaking... this will also let gas into the crankcase and or create hydro lock on at least one cyl! I've seen that happen on more than one occasion!moody smiley

I also have gone to electric fuel pumps. The biggest advantage for me is the ability to prime the carburetors before startup's. Our modern gas vaporizes so quickly and usually leaves the carb's low or nearly dry after a hot run!

As for Clarks mechanical pumps.... Sorry, I haven't used one in years. But My experience is that Clark's is vary good about standing behind what they sell.

Corventure Dave

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Re: Clark's Mechanical fuel pumps?
Posted by: steve c goodman ()
Date: June 15, 2017 08:26AM

Local club member had mech pump fill his eng with fuel in May. Needless to say an electric pump is now under the car.

best wishes, Steve
Rear Engine Spec. Inc. Golden, Colo.

1962 spyder 3.0L turbo 1965 Crown V8
1967 monza 110/4 1968 monza 110/4
1971 amante gt 110/4
CORSA/RMC/PPCC

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Re: Clark's Mechanical fuel pumps?
Posted by: Brizo ()
Date: June 15, 2017 10:25AM

Every mechanical pump made for many years has had the raised dam on the pump base and a little umbrella on the diaphragm push rod to prevent gas from getting inside the engine. It must have been a very old pump? or the vent passage was blocked?

Dan Brizendine,
'64 8door Greenbrier 140 PG. "In beautiful Wanamaker Indiana...with one stop light and 5 pizza shops"

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Re: Clark's Mechanical fuel pumps?
Posted by: jjohnsonjo ()
Date: June 15, 2017 10:42AM

""Now it has a silent electric pump""


What brand is silent?

J.O.

65 Corsa Turbo Vert
79 Honda XL 500S
69 Honda CL 160 D
2010 BMW F 650 GS
2003 Bounder 36D
2013 KIA Optima SX turbo-AKA ZIPPY (wife,s car)
69 Newport Holiday Sailboat
Baja 150 dune buggy cart
Coleman HS 500 UTV
2016 KIA Sorento SXL Turbo

Bethlehem,Pa

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Re: Clark's Mechanical fuel pumps?
Posted by: steve c goodman ()
Date: June 15, 2017 10:45AM

I didn't look inside Dan. If you follow that logic then the 3 year old pump that Craig describes above should not have dumped either.

Carbs were fine it wasn't leaking past the float valves I checked that first.

best wishes, Steve
Rear Engine Spec. Inc. Golden, Colo.

1962 spyder 3.0L turbo 1965 Crown V8
1967 monza 110/4 1968 monza 110/4
1971 amante gt 110/4
CORSA/RMC/PPCC

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Re: Clark's Mechanical fuel pumps?
Posted by: bwells ()
Date: June 15, 2017 12:14PM

I opened up a couple of new units recently purchased from FLAPS. They both looked to be made of quality material, but both had assembly problems that would have created problems if installed.
I have attached a couple of pics.These units have gaskets under the inlet and outlet valves I have not seen in older units. One of the units had a valve that was not seated on the gasket and the other had a valve staked down on a shifted gasket. Both would have leaked, in my opinion.
Fuel pump valve issue 1
Fuel pump valve issue 2

I would not use a new mechanical pump unless you or someone you trust can open it up and check it out.
Perhaps our vendors do this before offering them for sale?

Bill Wells
North Texas Corvair Assoc.
www.northtexascorvair.org
61 Ramp
65 Corsa

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Re: Clark's Mechanical fuel pumps?
Date: June 15, 2017 01:26PM

We have our mechanical pumps back in stock from our regular supplier. I installed one on my greenbriar and have so far had no problems.

I do not do ANYTHING to these pumps and never have.

Lon Wall
www.corvairunderground.com

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Re: Clark's Mechanical fuel pumps?
Posted by: Ratt643 ()
Date: June 17, 2017 02:16PM

corvairunderground Wrote:
-------------------------------------------------------
> We have our mechanical pumps back in stock from
> our regular supplier. I installed one on my
> greenbriar and have so far had no problems.
>
> I do not do ANYTHING to these pumps and never
> have.
>
> Lon Wall
> www.corvairunderground.com


Just curious Lon, have you checked the fuel pressure with your pumps? Thanks


1964 Monza Coupe

Maryville, TN
U.S. 129 The"Tail Of The Dragon"

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