Fuel pump bolt

All Models and Years
bengill
Posts: 28
Joined: Thu Mar 07, 2013 11:09 am

Fuel pump bolt

Post by bengill »

My fuel pump started leaking so I am in the process of replacing it So while removing itImageImage I found the fuel pump holddown bolt was stripped. I managed to get it off of using vice grips but I'd like to replace it going back together. Any idea where I can get it?


Sent from my iPhone using Corvair Forum mobile app
User avatar
bbodie52
Corvair of the Month
Corvair of the Month
Posts: 11872
Joined: Mon Aug 06, 2012 12:33 pm
Location: Lake Chatuge Hayesville, NC
Contact:

Re: Fuel pump bolt

Post by bbodie52 »

The bolt you removed was locked in-place with a jamb nut (see Fig. 59 in the shop manual images below). Hopefully the aluminum threads in the oil filter adapter were not damaged when you removed it. The jamb nut should have been loosened first and then the bolt itself should have unscrewed easily.

See the blue highlighted section of the 1965 Corvair Chassis Shop Manual, page 6M-28, below, for proper installation and torque specifications.


ImageImage
:link: http://www.corvair.com/user-cgi/catalog ... IN&page=65
Image

Part number C3251R: FUEL PUMP BOLT & LOCK NUT

Weight: 0 lbs 2 oz
Catalog Pages(s): 65
Price: $ 9.50

bbodie52 wrote:If you have any reason to remove and reinstall the fuel pump, be sure that you have installed it properly. You should confirm that the fuel pump is correctly seated and secured. There is a hole in the side of the pump shaft into which the tapered bolt tip must properly seat. If the pump is sitting too high and the bolt is simply pressing against the side of the pump housing, rather than seating inside the tapered hole, the pump push rod will not be doing its job. So first confirm proper pump installation, and then check the fuel pump output pressure and volume, as shown in the shop manual pages below. Fig. 57 in the shop manual page shows the tapered hole that the tip of the bolt fits into. This ensures proper installation and seating of the pump so that the pump mechanism is fully actuated by the push rod.

Image
bbodie52 wrote:The stock Corvair mechanical fuel pump has proven itself in performance and reliability for decades through millions of Corvairs. There is a tendency to quickly abandon it and go running to an electric fuel pump replacement at the first sign of apparent trouble. Old age can certainly be a drawback or weakness with this pump, but many continue to survive and perform well. There was certainly a history of poor quality aftermarket replacement pumps that developed a bad reputation for a while, and unfortunately rebuild kits are no longer available. But if you begin having what appears to be carburetor problems, don't be too quick to condemn the pump.

There are two relatively simple tests outlined in the Corvair shop manual. These tests measure output pressure and fuel delivery volume. The output pressure test utilizes a common vacuum/pressure gauge that is relatively inexpensive. The output pressure is regulated by an internal spring that is contained in the upper pump housing. Unless your pump springs a leak in one of the diaphragms or seals, it is likely that the output pressure will not change with age. However, new pumps may be fitted with a spring that produces an output pressure well in excess of the 4-5 psi standard. High-pressure can cause carburetor flooding, and is particularly a problem with the Carter YH carburetor found on turbocharged Corvairs, which is sensitive to excessive fuel pressure.

A new fuel pump should always be tested for output pressure. If the pressure is found to be excessive it may be possible to cut the spring or to exchange the spring from the old pump and fit it into the new pump. This may correct the output pressure.

The second test measures fuel flow at the fuel pump outlet. The standard in the shop manual states that the pump should be able to deliver 1 pint of fuel over a period of 40 seconds or less at engine cranking speed. If your pump does not appear to have any leaks and can pass the output pressure test, but fails to deliver the needed fuel volume, the problem may not be with the pump itself. There is a long fuel line that runs the length of the car from the fuel tank to the fuel pump. In order to pressurize and deliver fuel to the carburetors, the pump must be able to create a continuous vacuum in that fuel line to draw the fuel from the tank to the pump. Most of the fuel line is made up of steel tubing and is unlikely to develop a leak. However, there are two short lengths of rubber fuel hose in the fuel path. One section of hose is found at the fuel tank outlet, while the other is found adjacent to the starter motor — just before the line enters the engine compartment. The purpose of the second hose is to absorb vibration from the engine and prevent it from reaching the rigid steel fuel line. If either one of these two hoses develops a leak, the leak itself may not be apparent because the line is not under pressure so fuel will not be forced out. Instead, the leak amounts to a vacuum leak, which can allow air to enter the fuel line. This can prevent fuel from being drawn from the tank to the fuel pump, much like you might experience with a drinking straw if the straw was to split and developed an air leak in the side of the straw. What appears to be a faulty pump that is causing fuel starvation problems in the carburetors often turns out to be a leak in the fuel line at some point between the gas tank and the fuel pump. So if fuel starvation becomes a problem with your carburetors, there is a tendency to question the condition of the needle and seat valve inside the carburetor, or to blame the fuel filter at the carburetor inlet (thinking it is clogged), or to blame the fuel pump itself. Before you blame the pump and toss it, or abandon it and replace it with electric fuel pump, be sure to check the condition of the rubber fuel hoses at each end of the long fuel line between the fuel tank and the fuel pump. You may find that a couple of hose clamps and a few inches of replacement fuel hose is all that necessary to get you back on the road! :doh:

Image

There is also a fuel tank strainer inside the gas tank on the outlet tube. It was listed as a part used in 1960-1965 Corvairs, but it could be installed on any model year. It is conceivable that this strainer could become plugged and could restrict fuel flow to the fuel pump.
ImageImageImage

:chevy:
Brad Bodie
Lake Chatuge, North Carolina
Image 1966 Corvair Corsa Convertible
bengill
Posts: 28
Joined: Thu Mar 07, 2013 11:09 am

Re: Fuel pump bolt

Post by bengill »

So my fuel pump did spring a leak from the gaskets. So it was running just fine and I could physically see the fuel leaking from the fuel pump so it's not a delivery issue. I did thread the bolt back in to the oil filter housing and it threads fine


Sent from my iPhone using Corvair Forum mobile app
bengill
Posts: 28
Joined: Thu Mar 07, 2013 11:09 am

Re: Fuel pump bolt

Post by bengill »

I'll order the bolt from Clark's tomorrow


Sent from my iPhone using Corvair Forum mobile app
Garbanso
Posts: 6
Joined: Fri Apr 21, 2017 10:02 am

Re: Fuel pump bolt

Post by Garbanso »

i had to make my own after somehow bending though it took me a couple of hours drigging throu my pile of n&bs.also had to make that thinner lock nut.i also had a problem with my pump leakingits old but nothing in it torn, so i drilled all the bolt holes all the way throu bolt with nuts,,,problem solved
bengill
Posts: 28
Joined: Thu Mar 07, 2013 11:09 am

Re: Fuel pump bolt

Post by bengill »

So this was in pretty bad shape as well when I got the old pump off. Is this something I can get from my FLAPS. Or can I get it from a local hardware store it just looks like an inlet to the fuel pump that adapts to the flared line and it's my main intake line so I want to go ahead and make sure that it's new when I put it back on to prevent any leaks


ImageImage


Sent from my iPhone using Corvair Forum mobile app
User avatar
bbodie52
Corvair of the Month
Corvair of the Month
Posts: 11872
Joined: Mon Aug 06, 2012 12:33 pm
Location: Lake Chatuge Hayesville, NC
Contact:

Re: Fuel pump bolt

Post by bbodie52 »

Any damaged brass fittings from your fuel pump are available in the middle of the same page that listed the fuel pump bolt. I would strongly suggest making a complete list of everything you need so that all can be ordered and shipped at the same time. A combined shipment of all items is often much cheaper than ordering the individual items separately and having them shipped separately. This assumes that the threads in the fuel pump housing itself are in good condition. If the fuel pump housing is damaged you may have to order a complete fuel pump, which is also listed on the same page.

ImageImage
:link: http://www.corvair.com/user-cgi/catalog ... IN&page=65
Image

Part number C2449: FUEL PUMP INLET BRASS FITTING
Weight: 0 lbs 1 oz
Catalog Pages(s): 46(8A),65(A)
Price: $ 3.90


Part number C3229: FUEL PUMP OUTLET TUBE
Weight: 0 lbs 2 oz
Catalog Pages(s): 65(B)
Price: $ 5.25


Part number C3230: FUEL PUMP MULTICONN EXC TURBO,60 & 68-69
Weight: 0 lbs 2 oz
Catalog Pages(s): 65(C)
Price: $ 11.25
Fuel Pump Fittings.jpg
If you need any replacement fuel lines, they are listed on the Clark's Corvair Parts page below…
:link: http://www.corvair.com/user-cgi/catalog ... IN&page=67
Image
Brad Bodie
Lake Chatuge, North Carolina
Image 1966 Corvair Corsa Convertible
User avatar
66corsaguy
Posts: 256
Joined: Sat Apr 01, 2017 10:34 pm

Re: Fuel pump bolt

Post by 66corsaguy »

bengill wrote:So this was in pretty bad shape as well when I got the old pump off. Is this something I can get from my FLAPS. Or can I get it from a local hardware store it just looks like an inlet to the fuel pump that adapts to the flared line and it's my main intake line so I want to go ahead and make sure that it's new when I put it back on to prevent any leaks


ImageImage


Sent from my iPhone using Corvair Forum mobile app
I have found many fittings at my local plumbing supply shop. Even Home Depot has had some fittings. It doesn't look to be a corvair specific item. Unfortunately shipping and waiting a week for such a small part is not always something I want to do although I do try to support corvair vendors as much as possible.


Sent from my iPhone using Corvair Forum mobile app
User avatar
66corsaguy
Posts: 256
Joined: Sat Apr 01, 2017 10:34 pm

Re: Fuel pump bolt

Post by 66corsaguy »

Bring the old fitting to test and the female end is usually a good idea also cos the thread angle can vary.


Sent from my iPhone using Corvair Forum mobile app
bengill
Posts: 28
Joined: Thu Mar 07, 2013 11:09 am

Re: Fuel pump bolt

Post by bengill »

I will try ace tomorrow. If not I'll order from clarks. Going back to work Monday so if I can't finish this weekend it'll ha e to wait awhile......


Sent from my iPhone using Corvair Forum mobile app
bengill
Posts: 28
Joined: Thu Mar 07, 2013 11:09 am

Fuel pump bolt

Post by bengill »

Yay NAPA! They had the fitting and I'm back crusing the mean streets of Stockton hahahahaha


Sent from my iPhone using Corvair Forum mobile app
Last edited by bengill on Sat Sep 30, 2017 8:22 am, edited 1 time in total.
User avatar
66corsaguy
Posts: 256
Joined: Sat Apr 01, 2017 10:34 pm

Re: Fuel pump bolt

Post by 66corsaguy »

That's great!!!


Sent from my iPhone using Corvair Forum mobile app
Post Reply

Return to “Ask your Mechanical Questions here”