C2 fuel pump question?

[Bill S.]

is the outlet for a 66 427 pump different than for a 67. i bought a 90 degree adaptor and the fitting going into the fuel pump is too small. it is a 67 fuel pump i am using. is the outlet on the 66 pump smaller making it correct for the fitting?

[Joe L.]

Re: C2 fuel pump question?

Bill-----

I believe that the outlet fitting on either pump should be the same size---3/8 tubing (3/8" tubing nut is about 5/8" OD at the threads and 5/8" wrenching surface).

[Bill S.]

Re: C2 fuel pump question?

i got a 90 degree adaptor from paragon that they list as 1/4" X 3/8" the outlet on my #40482 pump is what i beleve to be 3/8 as the fuel line to the carb will thread in they said i would need to buy a #40366 as the outlets are different on the 2 pumps and they do not have a 3/8 by 3/8 90 degree fitting.

[John D.]

Re: C2 fuel pump question?

Bill, I do believe that the 66BB and 67 pumps are different in that the 67 has a machine thread with a seat. The earlier pumps are a straight pipe thread and the fitting is a tapered pipe fitting. But the 67 pump is NOT a pipe thread. In fact someone called me with a question similiar to this a couple of weeks ago. Fuel pumps are not my forte but I know some basics.
Maybe Jorjorian will come back and answer this question cause I am sure he can help you also. It seems that the guys have a lot of problems with pumps and fittings. Don't use any teflon tape on those fittings either. Causes grieve for sure and you will get dinged for it. John

[Richard S.]

Re: C2 fuel pump question?

Yes the pumps are different as are the lines from the carb to the pump. Don't ask me how I know......LOL...

[Joe L.]

Re: C2 fuel pump question?

Rick, et al-----

Well, that's interesting; I didn't know that. But I think that I understand now. The 3/8" TUBE fitting threads are approximately the same OD as 1/4" NPT. So, what I always thought was 3/8 TUBE is actually 1/4" NPT for some of these earlier pumps.

It also explains why Paragon has a 3/8 X 1/4 90 degree elbow---they're talking about an elbow with 3/8" TUBE on one end and 1/4" NPT on the other. That's a fairly common fitting. On the other hand a 3/8" TUBE to 3/8" TUBE is a very uncommon fitting in things automotive.

[Bill S.]

Re:3/8 to 3/8 solution

it apears that the L88 fuel line from the pump would be a solution it uses this pump and the same Y block as mine the line has a 90 degree bend at the pump with a 3/8 fitting on each end.

[Joe L.]

Re:3/8 to 3/8 solution

bill-----

Yes, assuming that the outlet fitting on the 66 pump and the L-88 pump are in the same relative position. This is another feature that varies widely among fuel pumps. In fact, the relative position of the inlet and outlet is one of the main things that generates the plethora of fuel pump part numbers.

[Bill S.]

Re: will stay correct.

i was hoping to fire it up this week end but guess i will order correct pump and start next week. the pump i had was a very nice but i made every thing else perfecr (still will be a driver) why stop here, bill