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Testing Mechnical Pumps off an engine
Posted by: Lane66m ()
Date: October 18, 2017 08:41PM

I understand that a mechanical fuel pump can be tested on an engine by cranking the engine and seeing what pressure it develops.

How would you check one off an engine? I have several off the engines I removed and would like to check them out to know which ones are good.

I did a search but came up empty in the discussions for the past 5 years.

Al Lane
Ellabell GA

1966 Monza Coupe, 110 hp, 4 Spd
1968 Camaro SS Coupe 350 CI 295+ HP PG
1964 Greenbrier Deluxe, 6 dr, 80 hp car engine, PG
2015 Chevrolet Malibu 2LT
2015 GMC Sierra SLT Crew Cab
1947 Farmall A tractor 15 hp


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Re: Testing Mechnical Pumps off an engine
Posted by: MattNall ()
Date: October 18, 2017 09:12PM

On a bench... push down and up and down...

Good ones make a definite sound.... no sound... no pumpeee! gg





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




Edited 1 time(s). Last edit at 01/15/2018 07:54AM by MattNall.

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Re: Testing Mechnical Pumps off an engine
Posted by: Frank DuVal ()
Date: October 19, 2017 08:01AM

Yes, press the plunger onto a hard surface with your finger over the inlet, and your finger should suck to the hole. Place your finger over the outlet and it should be pushed off the outlet.

The real question is how far to push! Anybody measured the lift of the pushrod in the engine? Yes, the fuel pump pushrod, not a valve pushrod!grinning smiley

Frank DuVal

Fredericksburg, VA

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Re: Testing Mechnical Pumps off an engine
Posted by: MattNall ()
Date: October 19, 2017 11:01AM

Never broke a diaphragm... just push a little to see if it makes noise..


OR measure the Lobe's lift!! gg





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: Testing Mechnical Pumps off an engine
Posted by: isucorvair ()
Date: October 19, 2017 01:21PM

It's called the Wacha Wacha test (like Fozzie Bear).

Pump should make that noise when depressed, as mentioned above smiling smiley


Eric P.
DeWitt, IA

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Re: Testing Mechnical Pumps off an engine
Posted by: Lane66m ()
Date: January 15, 2018 02:45AM

Ok, I finally checked my stock of pumps. 2 go wacha wacha. The rest, not a sound. I guess the silent ones are trash, except to keep the springs?

Al Lane
Ellabell GA

1966 Monza Coupe, 110 hp, 4 Spd
1968 Camaro SS Coupe 350 CI 295+ HP PG
1964 Greenbrier Deluxe, 6 dr, 80 hp car engine, PG
2015 Chevrolet Malibu 2LT
2015 GMC Sierra SLT Crew Cab
1947 Farmall A tractor 15 hp


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Re: Testing Mechnical Pumps off an engine
Posted by: vairmech ()
Date: January 15, 2018 04:47AM

Put some brake clean in the inlet of the pumps that don't make any sound and then see what happens.

You can also test fuel pressure off the car, just tee in a gauge and also check the pump for leaks!
Just hook up a fuel line to a can with an outlet and a shut off valve. Once you have fuel flowing through the pump shut off the valve and the push the pump up and down. The diaphragm should stay up if there are no leaks and that will also see if there are any internal or external fuel leaks, like a bad diaphragm.

Ken Hand
Handy Car Care
248 613 8586

Vairmech@aol.com

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Re: Testing Mechnical Pumps off an engine
Posted by: Lane66m ()
Date: January 15, 2018 04:50AM

Thanks, Ken. I'll give that a try on the next time I get some free time. I have print your info and will post in garage.

Al Lane
Ellabell GA

1966 Monza Coupe, 110 hp, 4 Spd
1968 Camaro SS Coupe 350 CI 295+ HP PG
1964 Greenbrier Deluxe, 6 dr, 80 hp car engine, PG
2015 Chevrolet Malibu 2LT
2015 GMC Sierra SLT Crew Cab
1947 Farmall A tractor 15 hp


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Re: Testing Mechnical Pumps off an engine
Posted by: jjohnsonjo ()
Date: January 15, 2018 04:53AM

Different issues can cause them not to work. If these are all AC/ GM pumps you can easily open them and see if a valve, valve seating or diagram. Back when money was really tight I would mix and match.

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: Testing Mechnical Pumps off an engine
Posted by: Lane66m ()
Date: January 15, 2018 04:58AM

J.O

Most of these came off cars parked in the early 80s. I can get numbers later today. I can't confirm the ones of the Rat Vair or the 67 vert I scrapped.

I may not mess with them for a while since my Monza will have an electric fuel pump with fuel lines routed to the front of the compartment. I just would like to know what I have, if it comes time to place them up for sale.

Al Lane
Ellabell GA

1966 Monza Coupe, 110 hp, 4 Spd
1968 Camaro SS Coupe 350 CI 295+ HP PG
1964 Greenbrier Deluxe, 6 dr, 80 hp car engine, PG
2015 Chevrolet Malibu 2LT
2015 GMC Sierra SLT Crew Cab
1947 Farmall A tractor 15 hp





Edited 1 time(s). Last edit at 01/15/2018 05:01AM by Lane66m.

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