I just replaced my fuel pump (after-market) with a correct rebuilt 4656. After installation I attempted to check to see if it was filling the fuel filter bowl and nothing. I checked to make sure I did not do some incorrect and when I could not find anything, I removed the re-built pump and checked to see that the pump worked as the one that came out of the car that was working when I began. All appears to be correct, made sure that the input and output lines were correctly connected. Re-installed and still nothing. I even attempted to prime the carb to try to get the engine started and the engine would begin to kick over, but still no fuel being pumped to the filter bowl. Can anyone provide any suggests other than that the re-built pump may not be good. I am going to try to contact my local pump rebuilding shop in town and have them check the pump on Friday, but want to see if anyone had any ideas that I may have missed. Thanks and Save The Wave, Dennis
-
-
Re: 62 Fuel Pump - Not Pumping?
dennis: disassemblr said contrary pump and it will tell you what's wrong with it. Perhaps the chap who rebuilt it didn't get the diaphragm attached to the pivot arm that rides off the cam. Assume you have fuel from tank to pump.good luck mike -
Re: 62 Fuel Pump - Not Pumping?
Dennis-----
Also, priming should not be an issue, at all. These types of pumps are self-priming and no priming should be necessary.
Other than a defective fuel pump, the only possibility that I can think of is a worn lobe on the camshaft. However, if the engine was pumping fuel without problem before you had the fuel pump rebuilt, it's unlikely that this is the problem.
You did make sure that the fuel pump pushrod was properly installed when you installed the pump, didn't you?In Appreciation of John HinckleyComment
-
Re: 62 Fuel Pump - Not Pumping?
Yes, I did check the rod and on the second install, I even pulled the rod out and check to see if there were any wear marks on damage. So I am hoping as Mike said the Chap that rebuilt it made an error in reassembly. I will take a look at the push rod and see that it is attached. I know that when I depress the plunger it sucks from the input and exhaust at the output with pressure.Comment
-
Re: 62 Fuel Pump - Not Pumping?
Dennis:
If your pump "sucks and pumps" it oughta' spit gas in the carb. You do know that sediment bulbs do not fill completely sometimes but still put gas in the carb? Just a thought.
MikeComment
-
Re: 62 Fuel Pump - Not Pumping?
Mike,
Yes I usually only have a little but I removed the bowl and tried and got nothing not even a vapor. ThanksComment
-
Re: 62 Fuel Pump - Not Pumping?
Dennis,
Did you put the pump on the car without the fuel lines and turn the motor over while checking the sucking from the fuel tank line side to see if it was sucking and to see if the output side was blowing? If it works in your hand it should work on the car IF the cam rod is pushing on the fuel pump arm. Are you sure it is the input side sucking? If the valves are in the pump reversed it will blow from the input side.
GeneComment
-
Re: 62 Fuel Pump - Not Pumping?
Gene,
Thanks, I was thinking of doing this and/or just connecting a hose to the inlet and hand operating it to see if it pumped gas. Will try tomorrow since I am off. The other test that I was planning to try tomorrow is to put the original working pump back on to make sure that the cam rod is working still.
Thanks againComment
-
Re: 62 Fuel Pump - Not Pumping?
Dennis:
While you have both pumps off compare the pump arms. Someone could have put the wrong arm on when they rebuilt it. Not likely, but a thought.
MikeComment
-
Re: 62 Fuel Pump - Not Pumping?
Dennis,
The other thing I have had go wrong is the pump arm slips off the pushrod while installing the pump but it will bolt in and look OK. Most chevys have a bolt in front of the engine by the pump hole that is drilled all the way to the pushrod with a very short bolt in it. If you take the short bolt out and put one in about an inch longer then hold the pushrod against the cam and bump the starter until the pushrod goes onto the low part of the cam (that movement will also tell you if your cam is OK) then while holding the pushrod in tighten the bolt HAND tight to hold the rod in and the pump is easier to bolt in place.
Remember to change the bolt back before turning the engine again. Just a thought.
Regards,
GeneComment
-
Re: 62 Fuel Pump - Not Pumping?
Gene,
I used the bolt in the front of the block to secure the rod. However you brought up a thought. I re-installed the orginal working pump and now nothing pumped from it. I removed the pump and the mounting plate and while holding the rod in place with my finger, my neighbor tapped the ignition to cycle the engine and cam to see the movement of the rod. It moved out and then back up and then cycled again. I left it in the up position so as to make the installation easier. Now that I know the rod is moving and I knew the orignal pump was working, I was going to reinstall it. But my last trail with the orignal pump gave the same results, so I am wondering whether to try the correct 4656 rebuilt pump this time? So much for trying this today, my wife has an outting for us and with tomorrow being Easter, I will think this over and try on Monday. In the mean time I will see if anyone has any other ideas.
Thanks to all that have responded. I guess if I do the NCRS Road Tour this year, I may have to change my handle from "Water Pump" to "No-Gas"?Comment
-
SOLVED 62 Fuel Pump - Not Pumping?
Thanks to all Replies, The problem is resolved. Apparently on the first attempt of installation of the 4656 pump, I did not have the pump lever under the rod and when I tighten it up I BENT the rod. So when I removed it and made other attempts at installing the pump and the original they all were missing the lever since the rod was bent and slipping off the side or end of the lever. Replaced the rod and before installing the pump I tapped the engine around to get the rod up to the furtherest clearence. Then before installing the bolts, I push the pump in and out several times to hear it work and make sure it was not binding. Then I started the bolts and still push in on the pump as I tightened the bolts. While I was at Carlisle a friend of mine told me that an engine builder friend of his always connects up the pump and pushes it in to pump gas in throught he lines before installing the bolts so as to reduce the lenght of time to crank the engine before fuel is up to the carb. I guess I will keep the bent rod as a reminder. Thanks again..Comment
-
Re: SOLVED 62 Fuel Pump - Not Pumping?
If it makes you feel any better, you are not the first to have this very same problem. The fuel pump is difficult to change on a C1 V-8, even with the cam aligned properly.Comment
-
Re: SOLVED 62 Fuel Pump - Not Pumping?
I just try to remember to put the engine on top dead center w/numero uno going to fire. That gives you maximum clearance to install pump- IE - you are on the base circle of the fuel pump cam lobe.Comment
Comment