Oil leaking from fuel pump
Thread Starter
Instructor
Joined: Aug 2015
Posts: 187
Likes: 15
From: New York
Oil leaking from fuel pump
After noticing some oil on the garage floor, it looks like the fuel pump is leaking oil. I think it has been leaking slowly for a while, but things just got a little worse, so it's time to jack up the car again. I don't think fuel is leaking... just oil. I can't tell if their is a fuel smell in the exhaust. I just know that the exhaust doesn't smell all that good.
My neighbor (who's a mechanic but not familiar with '72 Vettes) said to replace the gasket in the fuel pump and the gasket that sits between the pump and the engine. My question is should I just replace the gaskets or should I replace the whole pump?
My neighbor (who's a mechanic but not familiar with '72 Vettes) said to replace the gasket in the fuel pump and the gasket that sits between the pump and the engine. My question is should I just replace the gaskets or should I replace the whole pump?
Melting Slicks
Joined: Apr 2009
Posts: 2,632
Likes: 112
From: Great Plains Iowa
After noticing some oil on the garage floor, it looks like the fuel pump is leaking oil. I think it has been leaking slowly for a while, but things just got a little worse, so it's time to jack up the car again. I don't think fuel is leaking... just oil. I can't tell if their is a fuel smell in the exhaust. I just know that the exhaust doesn't smell all that good.
My neighbor (who's a mechanic but not familiar with '72 Vettes) said to replace the gasket in the fuel pump and the gasket that sits between the pump and the engine. My question is should I just replace the gaskets or should I replace the whole pump?
My neighbor (who's a mechanic but not familiar with '72 Vettes) said to replace the gasket in the fuel pump and the gasket that sits between the pump and the engine. My question is should I just replace the gaskets or should I replace the whole pump?
The minor leak could possibly be stopped by simply tightening the two 3/8" bolts that hold the fuel pump on and the little 1/4" bolts under them.
Melting Slicks
Joined: Feb 2006
Posts: 3,105
Likes: 96
From: Sunrise FL
Team Owner
Joined: May 2001
Posts: 87,357
Likes: 1,592
From: Western NY
I'd replace just the gaskets, as it's the most cost effective repair. However, if the pump has a LOT of miles on it, it's no extra labor to put a new one in there, since you have to remove the current one to replace the gaskets.
If you choose to replace it, make sure the replacement is for a Corvette, because there's a possibility that the "clocking" of the inlets and outlets are "Corvette specific"......but I'm not 100% sure of it.
If you choose to replace it, make sure the replacement is for a Corvette, because there's a possibility that the "clocking" of the inlets and outlets are "Corvette specific"......but I'm not 100% sure of it.
Race Director
Joined: May 2006
Posts: 18,728
Likes: 2,579
Fuel pump gasket?
After noticing some oil on the garage floor, it looks like the fuel pump is leaking oil. I think it has been leaking slowly for a while, but things just got a little worse, so it's time to jack up the car again. I don't think fuel is leaking... just oil. I can't tell if their is a fuel smell in the exhaust. I just know that the exhaust doesn't smell all that good.
My neighbor (who's a mechanic but not familiar with '72 Vettes) said to replace the gasket in the fuel pump and the gasket that sits between the pump and the engine. My question is should I just replace the gaskets or should I replace the whole pump?
My neighbor (who's a mechanic but not familiar with '72 Vettes) said to replace the gasket in the fuel pump and the gasket that sits between the pump and the engine. My question is should I just replace the gaskets or should I replace the whole pump?
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Thread Starter
Instructor
Joined: Aug 2015
Posts: 187
Likes: 15
From: New York
Btw... how do I check the pcv system?
Drifting
Joined: Jul 2002
Posts: 1,995
Likes: 110
From: Garland Texas
http://www.ebay.com/itm/Mechanical-Fuel-Pump-Auto-Extra-M4552-fits-66-70-Chevrolet-Corvette-7-0L-V8-/281771435602?fits=Make%3AChevrolet%7CModel%3ACorvette&hash=item419ae2e652&vxp=mtr
This is not a link to buy the pump, just using the pic for reference.
This is not a link to buy the pump, just using the pic for reference.
Thread Starter
Instructor
Joined: Aug 2015
Posts: 187
Likes: 15
From: New York
Mechanical Fuel Pump Auto Extra M4552 Fits 66 70 Chevrolet Corvette 7 0L V8 | eBay
This is not a link to buy the pump, just using the pic for reference.
This is not a link to buy the pump, just using the pic for reference.
Thread Starter
Instructor
Joined: Aug 2015
Posts: 187
Likes: 15
From: New York
Ok... next question. I went on AutoZone's website and they have different fuel pumps listed for the Holley carb and the Quadrajet. I have a Holley carb in my car, but the pump listed for the Holley carb only has two ports. My current fuel pump has the third line running back to the fuel tank. So I'm assuming I should be buying the pump listed for the Quadrajet then?
Melting Slicks
Joined: Apr 2009
Posts: 2,632
Likes: 112
From: Great Plains Iowa
Ok... next question. I went on AutoZone's website and they have different fuel pumps listed for the Holley carb and the Quadrajet. I have a Holley carb in my car, but the pump listed for the Holley carb only has two ports. My current fuel pump has the third line running back to the fuel tank. So I'm assuming I should be buying the pump listed for the Quadrajet then?
Yes, buy the pump that is the same as yours; the one with the inlet, outlet, and 1/4" return. The return allows some of the fuel to go back to the tank to cool off.
Le Mans Master
Joined: Dec 2006
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Burning Brakes
Joined: Dec 2005
Posts: 992
Likes: 56
From: Baldwinsville, NY
I would like to know the car year, engine size and what carb number.
A picture can tell loads.
C3 corvettes came with several engine size, configurations and carbs. Plus many owner's modified or replaced engines. Hard to say what you have.
A picture can tell loads.
C3 corvettes came with several engine size, configurations and carbs. Plus many owner's modified or replaced engines. Hard to say what you have.
Thread Starter
Instructor
Joined: Aug 2015
Posts: 187
Likes: 15
From: New York
Burning Brakes
Joined: Dec 2005
Posts: 992
Likes: 56
From: Baldwinsville, NY
That was quick.
I hope Lars chimes in on this.
The Holley carbs I have seen on Corvette applications had 2 port fuel pumps with a vent line on the inline filter and the pressure lines were steel tubing with hose on the vent.
That is not to say GM might have used a 3 port fuel pump on Holley applications similar to the Q-Jet set-up on most L48 engines like mine.
I hope Lars chimes in on this.
The Holley carbs I have seen on Corvette applications had 2 port fuel pumps with a vent line on the inline filter and the pressure lines were steel tubing with hose on the vent.
That is not to say GM might have used a 3 port fuel pump on Holley applications similar to the Q-Jet set-up on most L48 engines like mine.