Yesterday I spoke with an engineer with pump manufacturer Shurflo to speak with engineering. The 8000-643 series uses valves and a diaphram that is compattible with both engine oil and ATF. The pump body is also nylon and can tolerate an operating temperature of 150 deg. F.

I took a look on ebay and found one but then couldn't find out from Shurflo's website when this particular model was manufactured so I bought a new one. I'm not sure if this posting will earn me another infraction, but there might be someone here who is interested in doing this on the cheap, or using better technology to move their vegetable oil.

Shurflo 12V 1 8 GPM 60 PSI Pump 8000 643 296 with Hose and 12V Battery AB50 | eBay

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- Neil
'83 W123 (Ol' Yeller)
'82 HP 34C

For this pump to evacuate via the dipstick tube, it must be capable of pretty strong self priming. Let us know if you try it.

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85 300D turbo pristine w 157k when purchased 167,870 July 2025
83 300 D turbo 297K runs great. SOLD!
83 240D 4 spd manual- parted out then junked

No reason it shouldn't. Wouldn't have bought it otherwise.

8000 Series Diaphragm Pump - Automatic Demand Pumps 12 VDC

__________________
- Neil
'83 W123 (Ol' Yeller)
'82 HP 34C

It was finally time for an oil change in Ol' Yeller. I put together an electric pump extraction system design. Skip the cardio workout and step up to the 21st century! No 5-gallon buckets to leak vacuum/collapse or clean or need to store/trip over when empty!

The whole shootin' match is mounted to a piece of scrap plywood that hangs on the wall (photo #1). The assembly sits just fine straddling the air cleaner and cam chain bump in the valve cover. Because the pump has shock-mount feet, it doesn't go skittering around as a loose pump would.

Pump intake side (photo #2):
1. 1 foot of thick 3/4" ID vinyl tubing, which fits over the dipstick tube perfectly. No need for hose-clamps as this is the suction side.
2. 3/4" nylon barb - 3/4" pipe thread
3. 3/4" to 1/2" brass female-female
4. 1/2"-1/2" brass male-male
5. 1/2"-3/8" brass female-female
6. 3/8"-3/8" brass male-male

Pump discharge side (photo #3):
1. 3/8"-3/8" brass male-male
2. 3/8"-1/2" brass female-female
3. Nylon 1/2" pipe thread-1/2" barb
4. 4 feet of 1/2" ID vinyl tubing. Hose-clamp at pump end.

Used only Teflon pipe-joint paste to seal and lube threads.

3/4" nylon plug on intake hose end and 1/2" nylon plug on discharge end stop the lines from continued drooling once the extraction is done. (photo #5)

6" above the discharge line outlet, I tied a 4"x4" piece of 1/4" plywood (happened to be handy) to ensure that the line stayed in the waste oil container.

30 amp battery clamps are way over-spec for the 7 amp pump but fit the battery terminals OK.

I didn't think to time the extraction but I'm sure it was less than 2 min. Pump is rated for 1.8 gallons per minute but the specs don't indicate what the static head was when tested; presumably the test fluid was water.

No need to pre-heat the intake line. The heat of the engine and the dipstick tube is sufficient.

Cost: pump $90 + shipping. Tube and pipe fittings: $50.

Shurflo agricultural pump specs and vendor info:

http://www.pumpvendor.com/media/shurflo/Shurflo_8000-643-236.pdf
http://www.systemacc.com/catalog/product_info.php/cPath/21_301/products_id/1538?osCsid=9d06922c6fbd86bf5202fbbbd39f1ca9

The factory engineer told me that the valves and diaphragm of this specific pump are manufactured of materials that can hold up to the chemistry of waste oil at 150 deg. F oil temp. Self-priming up to 11 feet of static head, this particular application is less than 3.5 ft.

Attached Thumbnails

         

__________________
- Neil
'83 W123 (Ol' Yeller)
'82 HP 34C

I was thinking of making something similar, but I have a Gast scientific vacuum pump. I have a couple of other vacuum pumps as well.

I was going to run a line into a 5 gallon bucket and run a vacuum line to the top of the bucket. That way it would suck the oil into the bucket but not into the vacuum pump. If the bucket would not be great at holding the pressure I would use a long piece of fairly large PVC and use that as the container. It would just be more of a pain to empty out of that.

I've used a Tempo Oilboy for at least a dozen years. It's never broken down, never failed to extract the last drop, and has no problem with hot oil. From what I can see, the Mityvac is the evolutionary descendent:

http://www.amazon.com/Tempo-Oil-Boy-Fluid-Extractor/dp/B0000BYP0L/ref=pd_sxp_f_pt/188-9935687-8426158

vstech made one out of a 5 gallon Home Depot bucket and an A/C vacuum pump. He hooked it up to my wagon to try it out, it was the day I finally left his house with it after 6 months. Long story short it collapsed the bucket.

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The OM 642/722.9 powered family
Still going strong
2014 ML350 Bluetec (wife's DD)
2013 E350 Bluetec (my DD)

both my kids cars went to junkyard in 2023
2008 ML320 CDI (Older son’s DD) fatal transmission failure, water soaked/fried rear SAM, numerous other issues, just too far gone to save (165k miles)
2008 E320 Bluetec (Younger son's DD) injector failed open and diluted oil with diesel, spun main bearings (240k miles)

1998 E300DT sold to TimFreeh
1987 300TD sold to vstech

yea I figured that may happen. I am looking at getting a thicker material that I can seal, most likely a large section of PVC piping. I have also been looking at some other things.

I'll post when I figure it out.