2.8 Oil sending unit location?

shooterpcb · 10-22-2009, 05:21 PM

New S-10 2.8 owner. Thanks for having me here! Where is the Oil Sending Unit on my 2wd 1991 2.8 S-10 5 speed? I got a new one to install since my gauge quit working at 125xxx miles. Will a bunch of oil come leaking out when I remove it? Thanks!!

leprechaun1874 · 10-22-2009, 06:25 PM

you will loose a lit bit of oil (less than 1/2 quart). should be located on back of engine, driver side, bottom area.

AHH AIR · 10-23-2009, 12:27 PM

find the oil filter and its right there on that housing

ddog800 · 10-23-2009, 04:09 PM

Which one are you replacing?

bobditts · 10-23-2009, 06:33 PM

Quote: Originally Posted by ddog800

Which one are you replacing?

the one for the guage. Read his first post.

neo71665 · 10-24-2009, 01:20 PM

Quote: Originally Posted by ddog800

Which one are you replacing?

Does it matter they are right beside each other, but yeah he said it in the first post

The_Raven · 10-24-2009, 02:47 PM

Quote: Originally Posted by leprechaun1874

you will loose a lit bit of oil (less than 1/2 quart).

Next time shut the engine off first.

I have never had more than a couple drops of oil "lost" when removing the OPSU. These drops are just what has stuck to the OPSU.

ddog800 · 10-24-2009, 07:54 PM

Quote: Originally Posted by bobditts

the one for the guage. Read his first post.

I know, that's not quite what I meant, my apologies... The reason I'm asking is that I believe I need to replace the one that controls my fuel pump to correct a starting issue I'm having, but I'm not 100% sure which one it is... I'm want to find out exactly which sender he's replacing so I can at least rule out one that's not the one I need... if that makes any sense.

AHH AIR · 10-26-2009, 12:12 AM

nope none i havent heard of the opsu causing starting issues

BarelyGettinBy · 10-26-2009, 12:57 AM

Actually my truck would not start and finally found the wires going to the opsu had burnt on the manifold and shorted out, taped them up and tied them back and it runs. Weird but its true

AHH AIR · 10-27-2009, 12:55 AM

i know mine r close but not that close!!!!

ddog800 · 10-27-2009, 01:04 PM

There is one OPSU that can cause starting issues, it's the 2-pin sender. The reason is because it's connected to the circuit that powers the fuel pump. I assume the purpose for this is that in case oil pressure drops too low (i.e. non-existent) then it can ground out the circuit to kill the fuel pump, shutting off the engine and hopefully save your engine before it burns itself out. In some cases the switch can go back causing a no-start condition. When your wires burnt out and shorted on the manifold then the 12v destined for the fuel pump would have grounded out there.

vetkaw63 · 11-02-2009, 05:16 AM

Quote: Originally Posted by JSamsS10

Actually my truck would not start and finally found the wires going to the opsu had burnt on the manifold and shorted out, taped them up and tied them back and it runs. Weird but its true

Mine did that and I did the same thing.

MrGoodwrenchGM · 11-11-2009, 06:52 AM

Had the same problem with my '88. Both the canister (3 prong) and 2 prong sending units are under the drivers side wheel, connected to the 3 way fitting on your oil filter housing. My OPSU would work, but would take about 5 seconds average, more with first crank after oil change, and then fire right up. I got tired of waiting, so I installed a killswitch right under the cig lighter, and I just flip it before I get ready to crank, and no problems. Just remember to turn your switch off when you turn your truck off. You'll learn quick if not the hard way, trust me.

10-22-2009, 05:21 PM	#1
shooterpcb Registered User Join Date: Oct 2009 Posts: 1 Location: User is: OffLine	2.8 Oil sending unit location? New S-10 2.8 owner. Thanks for having me here! Where is the Oil Sending Unit on my 2wd 1991 2.8 S-10 5 speed? I got a new one to install since my gauge quit working at 125xxx miles. Will a bunch of oil come leaking out when I remove it? Thanks!!
	[Reply w/Quote]

10-22-2009, 06:25 PM	#2
leprechaun1874 Boobies Join Date: Jul 2006 Posts: 1,129 Location: Charlotte User is: OffLine	Re: 2.8 Oil sending unit location? you will loose a lit bit of oil (less than 1/2 quart). should be located on back of engine, driver side, bottom area.
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10-23-2009, 12:27 PM	#3
AHH AIR Subsonic Kustomz Age: 26 Join Date: Jan 2007 Posts: 319 Location: watervliet, mi User is: OffLine	Re: 2.8 Oil sending unit location? find the oil filter and its right there on that housing
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10-23-2009, 04:09 PM	#4
ddog800 Registered User Join Date: Oct 2008 Posts: 45 Location: User is: OffLine	Re: 2.8 Oil sending unit location? Which one are you replacing?
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10-23-2009, 06:33 PM	#5
bobditts banned Age: 25 Join Date: Aug 2008 Posts: 946 Location: User is: OffLine	Re: 2.8 Oil sending unit location? Quote: Originally Posted by ddog800 Which one are you replacing? the one for the guage. Read his first post.
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10-24-2009, 01:20 PM	#6
neo71665 4x4 v6 blazer Age: 29 Join Date: Oct 2004 Posts: 5,002 Location: rison arkansas User is: OffLine	Re: 2.8 Oil sending unit location? Quote: Originally Posted by ddog800 Which one are you replacing? Does it matter they are right beside each other, but yeah he said it in the first post
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10-24-2009, 02:47 PM	#7
The_Raven Registered User Age: 32 Join Date: Oct 2003 Posts: 1,039 Location: The Nest User is: OffLine	Re: 2.8 Oil sending unit location? Quote: Originally Posted by leprechaun1874 you will loose a lit bit of oil (less than 1/2 quart). Next time shut the engine off first. I have never had more than a couple drops of oil "lost" when removing the OPSU. These drops are just what has stuck to the OPSU.
	[Reply w/Quote]

10-24-2009, 07:54 PM	#8
ddog800 Registered User Join Date: Oct 2008 Posts: 45 Location: User is: OffLine	Re: 2.8 Oil sending unit location? Quote: Originally Posted by bobditts the one for the guage. Read his first post. I know, that's not quite what I meant, my apologies... The reason I'm asking is that I believe I need to replace the one that controls my fuel pump to correct a starting issue I'm having, but I'm not 100% sure which one it is... I'm want to find out exactly which sender he's replacing so I can at least rule out one that's not the one I need... if that makes any sense.
	[Reply w/Quote]

10-26-2009, 12:12 AM	#9
AHH AIR Subsonic Kustomz Age: 26 Join Date: Jan 2007 Posts: 319 Location: watervliet, mi User is: OffLine	Re: 2.8 Oil sending unit location? nope none i havent heard of the opsu causing starting issues
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10-26-2009, 12:57 AM	#10
BarelyGettinBy Registered User Age: 20 Join Date: Apr 2008 Posts: 1,359 Location: London Ky User is: OffLine	Re: 2.8 Oil sending unit location? Actually my truck would not start and finally found the wires going to the opsu had burnt on the manifold and shorted out, taped them up and tied them back and it runs. Weird but its true
	[Reply w/Quote]

10-27-2009, 12:55 AM	#11
AHH AIR Subsonic Kustomz Age: 26 Join Date: Jan 2007 Posts: 319 Location: watervliet, mi User is: OffLine	Re: 2.8 Oil sending unit location? i know mine r close but not that close!!!!
	[Reply w/Quote]

10-27-2009, 01:04 PM	#12
ddog800 Registered User Join Date: Oct 2008 Posts: 45 Location: User is: OffLine	Re: 2.8 Oil sending unit location? There is one OPSU that can cause starting issues, it's the 2-pin sender. The reason is because it's connected to the circuit that powers the fuel pump. I assume the purpose for this is that in case oil pressure drops too low (i.e. non-existent) then it can ground out the circuit to kill the fuel pump, shutting off the engine and hopefully save your engine before it burns itself out. In some cases the switch can go back causing a no-start condition. When your wires burnt out and shorted on the manifold then the 12v destined for the fuel pump would have grounded out there.
	[Reply w/Quote]

11-02-2009, 05:16 AM	#13
vetkaw63 Registered User Join Date: Aug 2008 Posts: 24 Location: User is: OffLine	Re: 2.8 Oil sending unit location? Quote: Originally Posted by JSamsS10 Actually my truck would not start and finally found the wires going to the opsu had burnt on the manifold and shorted out, taped them up and tied them back and it runs. Weird but its true Mine did that and I did the same thing.
	[Reply w/Quote]

11-11-2009, 06:52 AM	#14
MrGoodwrenchGM Registered User Join Date: Oct 2007 Posts: 29 Location: User is: OffLine	Re: 2.8 Oil sending unit location? Had the same problem with my '88. Both the canister (3 prong) and 2 prong sending units are under the drivers side wheel, connected to the 3 way fitting on your oil filter housing. My OPSU would work, but would take about 5 seconds average, more with first crank after oil change, and then fire right up. I got tired of waiting, so I installed a killswitch right under the cig lighter, and I just flip it before I get ready to crank, and no problems. Just remember to turn your switch off when you turn your truck off. You'll learn quick if not the hard way, trust me.
	[Reply w/Quote]