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  #1   IP: 107.72.164.133
Old 01-20-2019, 02:37 PM
Kevinstone Kevinstone is offline
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Mechanical oil pressure

Hi guys, does anyone know what the correct type of tubing for a mechanical oil pressure gauge should be? Can I use rubber fuel line? What's the maximum length for the tubing? I think 5-6 feet would get the gauge where I want it.
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Old 01-20-2019, 05:48 PM
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It depends on the rating of the fuel hose. When I relocated my oil pressure senders/switches off the engine to a bulkhead I used hydraulic hose, 300 psi rated available at NAPA. Be sure to use a proper hose barb fitting in the block.
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Old 01-21-2019, 02:13 AM
Marty Levenson Marty Levenson is offline
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copper

I tried hydraulic (grease gun?) hose (can't recall psi rating) that our NAPA store swore would work. Tested fine initially but on a long motor got false low reading as the oil temp rose. Went back to copper.

We run at 180 degrees.
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Old 01-21-2019, 11:22 AM
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When I moved my OP sender off the block, I used a tube from Home Depot meant for a grease gun - about 12" or 18" long. End fittings were 1/8 NPT so no issues. Not expensive.
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Old 01-21-2019, 02:06 PM
Marty Levenson Marty Levenson is offline
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hose length

Al: I'm wondering if hose length accounts for your grease gun hose working and mine not working. I'm guessing that for me the run from the block to the meter was about 3.5 feet. Kevinstone estimated he needs 5-6 feet.

Also, how hot do you run?
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Old 01-21-2019, 03:11 PM
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Quote:
Originally Posted by Kevinstone View Post
Hi guys, does anyone know what the correct type of tubing for a mechanical oil pressure gauge should be? Can I use rubber fuel line? What's the maximum length for the tubing? I think 5-6 feet would get the gauge where I want it.
You need something rated for at least 300 PSI. Copper is common, but you need a flexible section between that and the engine. As mentioned, grease gun hose is a cheap way to acquire such a thing. Gauges usually come with cheap nylon hose I do not trust at all.
5-6 feet should be no issue. I could see a really long line on a really cold day giving false low readings.
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Old 01-21-2019, 04:02 PM
Kevinstone Kevinstone is offline
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Thanks guys, I'll
Check out what auto parts have to offer. My gauge has a nipple which would require a flexible hose and hose clamp. Engine block end will
Take an npt barb
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Old 01-21-2019, 09:26 PM
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You may want to find a better gauge. The connection should be a flare or maybe compression.
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Old 01-21-2019, 10:20 PM
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I hooked up an oil pressure gauge on my old VW bus. I ran that plastic extension tubing from the engine (in the back) all the way to the dashboard. It was at least a 10 foot run. I bled the tubing and had oil all the way to the gauge. It was so accurate I would see the oil pressure drop as I shifted.

That was for a 67 bus a long time ago.
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Old 01-22-2019, 12:33 AM
Marty Levenson Marty Levenson is offline
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heat and length

Trying to understand why other hoses have worked.

Found the hose that I initially used for the oil pressure gauge: 4 feet long, 300psi grease gun hose. There is no doubt it caused the gauge to receive misleading pressure. Running at temp for a couple hours on a hot day the reading fell steadily from 20 to 8. (Same gauge directly on the block worked perfectly, and when reinstalled with a copper tube works fine.)

I do believe that running at 180 with a long run caused the hose to get too soft to maintain the pressure the rest of the system has. perhaps others are running at a lower temp or have a shorter run? Or my hose was defective (unlikely)?

There is no flexible connection at either end.
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