I have a 63 cadillac and I took it to a mechanic for a motor tune up long story short the fuel pump gave out and hes tried twice to order it and he says it didnt fit the original pump is smaller on the round part then the one they sent him but I dont know why is it bigger ?so when he goes to put it on it hits the motor he wants to go with an electric fuel pump but I dont want electric anyone out there know why we keep getting the wrong pump?

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Can u post pics of it installed I might need to get a new mechanic and I cant see any pics of the ones you posted

Here is an embedded pic of the one Bill posted. As everyone had said there are 2 exterior designs - a unibody with a single casing and original style with screws holding the sections together. I have also enclosed a close up of Bills picture:

Hmm looks like the one we got heres a pic of my spacing where it needs to go maybe you see something 

Thats a cast in flange.

The engine mount looks weird, the bracket is mounted on wrong side.

Motor Mount goes behind the engine mounting flanges on left driver side and in front of the engine mounting flanges on the right passenger side.  Looks like you got it in front on the left driver side.

Maybe a stupid question but,  does your mechanic understand the he needs to turn the engine so that the cam is right position to get the pump in?  They  don’t normally slide right in, it takes a little fiddling.  


Hi Daniel

The heavy spring on the fuel pumps arm will make it impossible to blot the new pump in ——if the engines cam ( which the pumps arm  rides on ) is not in the right location when bolting the fuel pump in your engine block 
Need to rotate the engine until you can get the arm into the block as much as is  possible and then bolt it in 

Just to help clarify what Phil is pointing out which could be the issue 
Most fuel pumps today are located in the fuel tank with fuel injection engines so some young mechanics may not have any experience installing this type pump into an engine 

Hope that is the simple solution to your fuel pump installation issue 

It seems very odd to me that a fuel pump would suddenly go bad while a mechanic is working on a car to be doing a tune up ( odds are slim to none ) 

That leaves open the possibility the mechanic is hitting you up for  an additional repair you do not need so consider using caution with him moving forward 

His skills would be in question  to me regarding this  fuel pump repair — if you needed it at all 

These kind of issues are constantly in question when dealing with mechanics and car repairs which makes the process very frustrating relying  on expensive shops to do the right thing for you and your pride and joy 

Enjoy 

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