MRBIGROD48
Forum Newbie
Posts: 9
Reg: 10-29-10
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 07-23-12 10:35 AM - Post#2251204
WELL TEAM I THOUGHT I HAD SEEN IT ALL! I JUST REPLACED THE ENGINE IN MY 1988 CHEVY C1500 5.7L WITH THE SAME TYPE OF ENGINE. I FOUND THE OIL SENDING UNIT NEAR THE OIL FILTER WAS LEAKING PRETTY BAD WHEN I TOOK ORIGINAL ENGINE OUT SO I KNEW I HAD TO REPLACE IT ON NEW ONE. WELL 3 MONTHS DOWN THE ROAD I SEE THIS OIL LEAK THAT IS SLOWLY DRIPPING FROM THE REAR OF MY NEW ENGINE BLOCK AND NOW I AM TOLD I NEED TO REPLACE THE OIL PRESSURE SENDING UNIT. SOMEONE HELP ME OUT: WHY DO I HAVE TWO OIL SENDING UNITS ON MY 1988 CHEVY C1500 5.7L AND WHY DOES EVERY PLACE I GO TO IN PERSON AND ONLINE SHOW THERE IS ONLY ONE? CAN SOMEONE SEND ME A PIC OF WHAT THE PART I AM LOOKING FOR LOOKS LIKE. I DO NOT HAVE A GAUGE ACTING UP OR MISREADING, I JUST HAVE AN OIL SPOT IN MY DRIVEWAY THAT I DO NOT NEED TO SCARE ME EVERY TIME I DRIVE MY TRUCK. I NEED SOME HELP FROM SOMEBODY THAT HAS BEEN HERE BEFORE. I AM ABOUT TO WORRY MYSELF GRAYHEADED.
THANKS,
ROD (DALLAS,TX)
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rockfangd
Contributor
Posts: 543
Age: 27
Loc: Utica ny
Reg: 04-13-10
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07-23-12 10:53 AM - Post#2251209
In response to MRBIGROD48
ok. the one on the back of the engine is a oil pressure sending unit. It goes to the pcm and enables the fuel pump once oil pressure is recognized. There is room in the plug for 3 wires but I believe this one only uses 1.
The one near the oil filter is for the gauge. It works off a ground. It is called the oil pressure sensor.
please feel free to correct me if I am wrong on this as I am going off the top of my head on what I am familiar with.
Also the sender is long and skinny and the sender is more stubby
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MRBIGROD48
Forum Newbie
Posts: 9
Reg: 10-29-10
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07-23-12 11:18 AM - Post#2251219
In response to rockfangd
ANY SUGGESTIONS ON WHERE TO START LOOKING. I JUST PURCHASED ONE FROM A NEIHBORHOOD PARTS STORE AND I WAS TOLD THIS WAS THE ONLY ONE IT SHOWED.
THANKS FOR THE EXPLANATION...
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fuzzyff
Forum Newbie
Posts: 45
Loc: CA
Reg: 06-13-12
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07-23-12 03:08 PM - Post#2251287
In response to rockfangd
rock-fang-d, they are BOTH "oil pressure sending units" (and they are BOTH "oil pressure sensors" (they BOTH work off of grounds, because EVERYTHING in an elelctrically operated car/truck uses GROUNDS to work. You didn't advise the questioning member that he has no worries at all. Because that is the final answer.Whether a car/truck has one, or two, or three, or 15 oil pressure senders/sensors, they are NEEDED for multiple jobs, so don't SWEAT the Small Stuff. As for the LEAKS that the questioner mentioned (and you didn't even comment on), the use of gasket-sealer at the threaded joint in question, or a cast-iron or brass pipe plug in it's place,but the man need not freak out just because there are more than ONE oil pressure sensor/sender/respondent/ indicator..... ok. the one on the back of the engine is a oil pressure sending unit. It goes to the pcm and enables the fuel pump once oil pressure is recognized. There is room in the plug for 3 wires but I believe this one only uses 1.
The one near the oil filter is for the gauge. It works off a ground. It is called the oil pressure sensor.
please feel free to correct me if I am wrong on this as I am going off the top of my head on what I am familiar with.
Also the sender is long and skinny and the sender is more stubby
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fuzzyff
Forum Newbie
Posts: 45
Loc: CA
Reg: 06-13-12
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07-23-12 03:12 PM - Post#2251289
In response to fuzzyff
ah, but even common sense would show you that, in an installation with 2 or more oil pressure sensors, you don't know if Both sensors would be the SAME? They "might" be the same. Only the factory knows, for sure. So, check with the FACTORY, don't play games with repair-artists. Get the info from the Source, or as CLOSE to the source, as you can.
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 someotherguy
Moderator
Posts: 23370
Age: 43
Loc: Texas
Reg: 08-01-03
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07-23-12 03:36 PM - Post#2251303
In response to fuzzyff
What's with the attitude, fuzzy?
On the original poster's '88, there is an oil pressure sensor for the gauge - it's located on the driver's side of the block near the oil filter. There's also an oil pressure switch, which is part of the fuel pump circuit; it's located on the top of the block behind the rear of the intake. Around '91, these two units were combined into a combo unit that lives in the top of the block/behind intake location.
The parts are absolutely different numbers yet many parts houses have difficulty telling them apart because too many of their employees are inexperienced.
How is the original poster supposed to check with GM about his 1988 model truck? "Only the factory knows, for sure" ?? What do you base that on?
Oil pressure sending unit for the side of the block, feeds the gauge, Standard # PS269
Oil pressure switch for the top rear of the block, part of fuel pump circuit, Standard # PS211
MRBIGROD - reach down behind the distributor and pop the connector off the sender, see if it has the rounded edge multi-pin connector that would plug into that second item pictured.
Richard
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fuzzyff
Forum Newbie
Posts: 45
Loc: CA
Reg: 06-13-12
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07-23-12 04:00 PM - Post#2251320
In response to someotherguy
I was addressing the Original post that expressed surprise that there could Be More Than ONE Oil Pressure Switch, OK? ONE of the switches/sensors is an ENABLE switch. It ENABLES the electric fuel pump to operate. Without it, the Electric Fuel Pump can NOT operate, at all. GET IT? ...Then... the OTHER Oil Pressure sensor/switch/potentiomet er pertains to engine operational feedback, to a warning light or guage. THAT is the attitude, some of you regulars seem to get bored with the Original question, and go off into ...whatever. I tend to read the original question, and answer it. Any problem with a man going to the original? What's with the attitude, fuzzy?
On the original poster's '88, there is an oil pressure sensor for the gauge - it's located on the driver's side of the block near the oil filter. There's also an oil pressure switch, which is part of the fuel pump circuit; it's located on the top of the block behind the rear of the intake. Around '91, these two units were combined into a combo unit that lives in the top of the block/behind intake location.
The parts are absolutely different numbers yet many parts houses have difficulty telling them apart because too many of their employees are inexperienced.
How is the original poster supposed to check with GM about his 1988 model truck? "Only the factory knows, for sure" ?? What do you base that on?
Oil pressure sending unit for the side of the block, feeds the gauge, Standard # PS269
Oil pressure switch for the top rear of the block, part of fuel pump circuit, Standard # PS211
MRBIGROD - reach down behind the distributor and pop the connector off the sender, see if it has the rounded edge multi-pin connector that would plug into that second item pictured.
Richard
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454contractor
Forum Newbie
Posts: 17
Reg: 01-21-11
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07-23-12 04:11 PM - Post#2251330
In response to fuzzyff
No problem addressing the original question. Which rockfngd actually did, but maybe if you could be a little more critical in your wording (maybe use all caps to emulate talking to a 4 year old ) it would really make this forum something.
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fuzzyff
Forum Newbie
Posts: 45
Loc: CA
Reg: 06-13-12
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07-23-12 04:41 PM - Post#2251351
In response to 454contractor
....well, OK...it's just that the tendency seems to be that the Original question seems to be a "toss-up" in some way, and some dude goes off on a tangent, and then the thread becomes an independent expression of a nature that has little to do with the original. At that point, it's just "flak" in the sky, and what's the point, when it has de-generated into a different mechanical issue, that does not pertain to the original question? I'm all for democracy, free speech, listen to opinions, and such, but when discussing mechanical issues, democracy doesn't apply to much. No problem addressing the original question. Which rockfngd actually did, but maybe if you could be a little more critical in your wording (maybe use all caps to emulate talking to a 4 year old ) it would really make this forum something.
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someotherguy
Moderator
Posts: 23370
Age: 43
Loc: Texas
Reg: 08-01-03
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07-23-12 04:48 PM - Post#2251354
In response to fuzzyff
Something tells me you won't be the first to discover that people that come in here with a chip on their shoulder don't last long. 
Richard
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rockfangd
Contributor
Posts: 543
Age: 27
Loc: Utica ny
Reg: 04-13-10
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07-23-12 10:05 PM - Post#2251482
In response to fuzzyff
you know excuse me for not being perfect. I take my time to give some info but I am not a rocket scientist. I am also not the only one on the forum. I really dont need to hear what I need to say or not say SO I think you should keep your thoughts to yourself. If you are so smart why are you here?
I am sorry but I work hard and I need no BS.
To the creater of this thread I do apologize for the reply but I think it is not necessary to bash other members. Thank you
Also I think I pretty directly answered the question.
Edited by rockfangd on 07-23-12 10:09 PM. Reason for edit: No reason given.
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55 Shaker
Member
Posts: 1043
Age: 63
Loc: north central IL.
Reg: 03-13-06
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07-24-12 12:57 AM - Post#2251505
In response to rockfangd
I don't know what's up with fuzzyff. Over on the 55-57 modified forum, the moderator took his posting rights away.
http://www.chevytalk.org/fusionbb/showtopic.php?ti...
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