Could anyone please tell me the thread size on the mechanical fuel pump inlet port? I expect the outlet port will also have the same size thread.
Thanks in advance,
Ron.
Thanks in advance,
Ron.
Fuel Pump Thread Size
- Thread starter SydneyRoverP6B
- Start date
Well I have done some investigating and have found the following.
The AC valve chamber inlet and outlet ports are not BSP threads,...tapered or straight. So what might they be? I took the valve chamber to Pirtek, the fellow looked at it, scanned the wall of containers before him and then reached into one, pulled out a brass fitting and voila...perfect fit. So what was it? The fellow said it was an SAE thread.
I thought.."fair enough" but....behind the threads leading into the pump there is a taper which provides the seal. On the brass fitting there is an extension behind the threads and then the taper which seals against the port taper.
So I did some reading and suitable SAE fittings typically have a 45 degree taper, where as the fitting that I had provided a 30 degree taper,..corresponding with the taper within the port. That means that it had to be something else. As best I can tell it is a NPT fitting,...in this case a NPSM which is a National Pipe Straight Mechanical fitting. Both NPT and SAE are American threads and both have the same thread profile.
AC Delco..being an American company, it would seem logical that the fittings within would also be American in profile. The same applies to the AC fuel filter, the thread on the swivel nuts and their fitting arrangment with the olives and accompaning pipes being NPSM.
As for the size thread size of the fittings,...still not 100% sure but 1/4" seems likely with 5/16" barbs. The fuel delivery lines are all 5/16".
Ron.
The AC valve chamber inlet and outlet ports are not BSP threads,...tapered or straight. So what might they be? I took the valve chamber to Pirtek, the fellow looked at it, scanned the wall of containers before him and then reached into one, pulled out a brass fitting and voila...perfect fit. So what was it? The fellow said it was an SAE thread.
I thought.."fair enough" but....behind the threads leading into the pump there is a taper which provides the seal. On the brass fitting there is an extension behind the threads and then the taper which seals against the port taper.
So I did some reading and suitable SAE fittings typically have a 45 degree taper, where as the fitting that I had provided a 30 degree taper,..corresponding with the taper within the port. That means that it had to be something else. As best I can tell it is a NPT fitting,...in this case a NPSM which is a National Pipe Straight Mechanical fitting. Both NPT and SAE are American threads and both have the same thread profile.
AC Delco..being an American company, it would seem logical that the fittings within would also be American in profile. The same applies to the AC fuel filter, the thread on the swivel nuts and their fitting arrangment with the olives and accompaning pipes being NPSM.
As for the size thread size of the fittings,...still not 100% sure but 1/4" seems likely with 5/16" barbs. The fuel delivery lines are all 5/16".
Ron.