Fuel Pump Replacement.....
Thread Starter
Pro
Joined: Oct 2006
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From: Kentucky
Fuel Pump Replacement.....
I have a 79' L48 and I'm getting ready to replace the fuel pump. It works but when it sets overnight, all the gas leaks back down and I have to pump the gas about 20 times to get it built back up.
Anyone have some helpful advice, procedures or a heads-up before I take off the old one? I've never replaced one before.
Anyone have some helpful advice, procedures or a heads-up before I take off the old one? I've never replaced one before.
Safety Car
Joined: Nov 2004
Posts: 4,359
Likes: 57
From: Mundelein Illinois
If your going to replace it. Remove the two mounting bolts through the passengers side wheel well.
When I had a boat it did the same thing. I would crank it for 15 seconds to build pressure then pump the throttle two times and it would start right up.
When I had a boat it did the same thing. I would crank it for 15 seconds to build pressure then pump the throttle two times and it would start right up.
Race Director
Joined: May 2006
Posts: 16,528
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From: Dayton, Ohio
Here is a thread where we talk about holding the fuel pump rod up with a tool through the front of the block and also how to get to the bolts that hold the pump from under the fender. The tool can be made by grinding the threads off a bolt.
edit--oooops forgot the link-- http://forums.corvetteforum.com/c3-t...placement.html
edit--oooops forgot the link-- http://forums.corvetteforum.com/c3-t...placement.html
Last edited by ...Roger...; May 26, 2009 at 05:38 PM.
Le Mans Master
Joined: May 2002
Posts: 5,084
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From: Lebanon Township New Jersey
Before you change the pump - are you sure that its bad? The description you gave could be a carburetor problem. A bad fuel pump would usually cause the engine to die while you are accelerating.
Race Director
Joined: May 2006
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From: Dayton, Ohio
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Team Owner
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From: Crossville TN
Remove right/front wheel. Use 2 squeeze-type clamps (or vise grips, small C-clamps, whatever...) to stop fuel flow in the flexible lines at the pump. Remove fuel lines then the pump. Before you install the new one, turn engine over enough to put drive pin in "UP" position [so there is no resistance on the pump arm]. Put grease on the drive rod to keep it in UP position, then install the pump.
Race Director
Joined: Apr 1999
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From: CORVETTE 77 385 C.I. TEXAS
http://forums.corvetteforum.com/c3-t...placement.html
Race Director
Joined: May 2006
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From: Dayton, Ohio
Just curious,how are you getting the grease on the rod are you talking about putting grease on the outside of the rod or are you removing the rod and putting the grease on the cam end of the rod ?
Intermediate
Joined: May 2009
Posts: 39
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From: Montgomery TX
I have a 79' L48 and I'm getting ready to replace the fuel pump. It works but when it sets overnight, all the gas leaks back down and I have to pump the gas about 20 times to get it built back up.
Anyone have some helpful advice, procedures or a heads-up before I take off the old one? I've never replaced one before.
Anyone have some helpful advice, procedures or a heads-up before I take off the old one? I've never replaced one before.
I agree with the response that the fuel is evaporating faster now than in the past.
I have an EDL-1400 on it now. I moved the accelerator pump connection to the quickest response, push the pedal to the floor three times, cranks about 5 seconds and starts.
I you don't want to do this "technique", I also agree an electric fuel pump is what will be needed. A check valve in the fuel line might be something to consider also.
And it would'nt hurt to verify you have the engine tuned, incliuding the carb. Anything out of wack, will increase "cranking time"
zmanc3
Race Director
Joined: May 2006
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From: Dayton, Ohio
If you suspect the problem is that the fuel is returning to the tank its easy to prove-just clamp the rubber hose between the fuel pump inlet and the steel line going back to the tank. Leave the car sit a couple days and try to start-if it starts it was draining back.
Race Director
Joined: Apr 1999
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From: CORVETTE 77 385 C.I. TEXAS
Thread Starter
Pro
Joined: Oct 2006
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From: Kentucky
I could live with the pumping. Thats not the only reason I'm replacing it though. I want to make my car a little more dependable so I can drive it to car shows and other sorts. Hate to be stuck on the side of a road because of a failing fuel pump and have to call a wrecker to tear up my car. I think it still has the original fuel pump. Are airtex fuel pumps any good?
Thanks for the advice guys.
Thanks for the advice guys.