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Chevy 350 Oil Pump...

Old 02-06-2006, 09:11 PM
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Default Chevy 350 Oil Pump...

Was driving home today and the oil pressure on my 95 chevy (see sig pic) dropped to NOTHING! I pulled over and had a tow to my garage that was closed. Anyone know what a replacement oil pump would cost, installed, and what has to happen for the install?



THANKS IN ADVANCE!!!
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Old 02-06-2006, 09:29 PM
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Default Re: Chevy 350 Oil Pump...

If the motor didn't start rattling or knocking then I'd sooner suspect the sending unit took a crap..I have seen this several times in GM's...If you are unsure have someone check the oil pressure and go from there..Oil pumps generally don't go bad...

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Old 02-06-2006, 09:47 PM
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Default Re: Chevy 350 Oil Pump...

That is one of the things that I will have them check, I just did not want to drive it.
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Old 02-06-2006, 09:56 PM
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Default Re: Chevy 350 Oil Pump...

not driving it was the smart move. while it typically isn't a huge deal to drop the pan on a truck, your's being 4x4 will add a bit of labor to the situation. Like was mentioned above, chances are it is the sending unit, otherwise you would have heard all sorts of crazy noises coming from the motor.
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Old 02-06-2006, 10:01 PM
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Default Re: Chevy 350 Oil Pump...

Unless you heard metal on metal my guess is sending unit. Had one go bad on my old Dodge. Try and locate it and see if the connection is ok.
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Old 02-06-2006, 11:22 PM
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Default Re: Chevy 350 Oil Pump...

I'd think most times the oil pump will fail gradually, not instantly. I'm betting on the sending unit.
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Old 02-06-2006, 11:35 PM
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Default Re: Chevy 350 Oil Pump...

Now is the time to tell the wife your getting the new F650 super cruiser so you wont have these truck problems.

It's probley just the sending unit but it was good ya shut her down to find out.
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Old 02-07-2006, 12:20 AM
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Default Re: Chevy 350 Oil Pump...

The sendling unit is likely clogged and therefore not working (as mentioned)...
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Old 02-07-2006, 12:47 AM
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Default Re: Chevy 350 Oil Pump...

Are you 100% certain you have oil in the engine????

Question: Were you actually looking at the gauge on the dash when this happened? Did you actually see the needle drop down to zero, pull over and then shut the engine off? Or did you glance down and see the needle on zero, pull over and then shut the engine off? This destination is important in diagnosing the problem.

If I were diagnosing the problem, the first thing I’d do is pull you sender unit and stick in a oil pressure gauge, fire up the engine and read the gauge. If I had pressure then I knew it’s electrical. If the gauge showed no pressure I’d kill the engine and pull the pan.

Generally what goes in an oil pump is the spring, they break. Rare but it can and does happen, the end of the distributor shaft breaks.

Either way if you didn't hear horrible noises coming from the engine I'd be inclined to go with an electrical or sending unit problem.

Being a 95 Chevy I'd be HARD pressed to think the factory would put a mechanical oil pump gauge in her, so clogging of a line wouldn't be an issue.


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Old 02-07-2006, 09:18 AM
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Default Re: Chevy 350 Oil Pump...

Thanks for all the advice, after poking around the net, I think that it is the sending unit too. There were no terrible noises, etc from the engine. It did happen kinda suddenly though. I had not moved a mile after work yesterday before it happened. It was fine when I got to work.

Yes, there was oil in it, that was the first thing I checked whilst I was stranded (until my wife came) on the side of the road. I even added another quart to make sure that it was enough, and no luck.


Ends up that I have been paying for roadside assistance in the cell phine plan that I had. Called them and they arranged a 25 mile tow for $30. My trusted garage is in the next town. Anyways, it is there being checked out.
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Old 02-07-2006, 09:50 AM
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Default Re: Chevy 350 Oil Pump...

Although I've read over filling an engine with oil a dozen times is harmful to an engine, I still don't know how much oil is to much, no article has ever said. But apparently the problem is over filling is hard on the bearings and seals.
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Old 02-07-2006, 09:54 AM
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Default Re: Chevy 350 Oil Pump...

I was thinking that when I put it in, but I cannot say that having too much oil is worse than having no oil pressure. I knew that either way the truck would not run more than the 20 minutes that it would take to get to the mechanic to get it checked out!

It was worth the risk IMHO.
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Old 02-07-2006, 03:44 PM
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Default Re: Chevy 350 Oil Pump...

Keep us posted??
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Old 02-07-2006, 04:00 PM
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Default Re: Chevy 350 Oil Pump...

if you have oil in it pull a valve cover or just the fill cap if oil is splashing you have a sending unit problem if oil is not there starting it didn't hurt it anymore than whas already happened
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Old 02-07-2006, 04:15 PM
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Default Re: Chevy 350 Oil Pump...

It is the pump...another day to acertain the damage...the shop is busy.

He put a manual gauge on it and it read 0 oil pressure.
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Old 02-07-2006, 08:47 PM
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Default Re: Chevy 350 Oil Pump...

WOW that is weird...In close to 30 years of wrenching I have seen 2 pumps quit working and both were caused
from the pump gears being jammed by a small piece of hard gasket. Each one had twisted the drive shaft off. Good call
on pulling over...That saved you having to buy that F650...

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Old 02-09-2006, 12:29 PM
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Default Re: Chevy 350 Oil Pump...

Well, it is apparently not the oil pump either. I am going to the shop in a few minutes, the mechanic wants to show me some things and talk about next steps...
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Old 02-09-2006, 03:53 PM
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Default Re: Chevy 350 Oil Pump...

Well, F650 here I come...there are two possibilities that are wrong with it, either there is something lodged in the oil channels or a bearing has turned blocking the oil.

He gave me the option of trying a hi-flow pump to see if that would dislodge something and allow oil to flow again, but that is not anywhere near garanteed to work and will cost about $350 that I could be putting toward a new engine.

I have talked to the wife and I think that I will be looking for something used/new or something... I just don't know what to do with the other truck. Running it is worth about 8k, but what about not running....any input on where I should go?
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Old 02-10-2006, 09:10 AM
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Default Re: Chevy 350 Oil Pump...

I see that your truck is a 1995, so it does not have the Vortec engine....I think they came out in 96, so at the end of the day you have to really consider if putting a new engine in the truck is worth to you....the way I look at it is I were to buy new truck my payment would be X for X months, I could put the new engine in the truck for the equivelant of 3 new truck payments...and its still paid for...

jmo

To put in perspective, I have 1997 GMC Jimmy, not quite big enough to tow my boat any long distances comfortably but it has 200k miles on it (second engine due to the Dealer screw-up)

I am satisfied with the truck and routine maintenance and repairs run about 1500.00 year, If I went and bought a new Full Size GMC/Chevy I would have an annual payout of about $7000 year for 5 years....

So in summation 5500.00 year buys a lot of beer and tackle....
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Old 02-10-2006, 10:02 AM
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Default Re: Chevy 350 Oil Pump...

Derek, you drink a lot more than $5500 in beer and if you didn't get so drunk you were throwing the tackle in the water - well..
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