AC fuel pump diaphragms

[andrew honychurch]

Interesting information thx David. I did much the same on my Stuart tank and replaced the original diaphragms with a simple neoprene gasket and then fitted an electric fuel pump instead. I am minded to go with the latter as another problem with modern fuels is the ammount of additives which seem to turn into gases and cause vapour locks. I have found on other vehicle having a modern higher pressure pump will help compress the gasses and allow fuel through when hot. I think a lot of modern systems get by this problem with having returns to the fuel tank from the carburettor. I did read your old post and you stated that there was a difference between the Carburettor pressure requirement and the fuel pump output. I can certainly see from the manual what the AC pump puts out from the manual but i have not found out any information on what the Holley carburettor is designed to accept. I am sure in the long run, the T16 will run better with a modern fuel pumping system in place.

EDIT...the point being that if one has too much pressure then presumably the carb will flood

[horsa]

A fuel return would have solved a lot of problems and ensured easy starting. But I couldn't think of a good way to hide it so settled for the electric fuel pump on its own.

On the pressure, seems like the original fuel pump is either 4 or 4.5 psi and the carb was 3.5 psi. Not a problem if everything was seating properly and the fuel pump wasn't actually putting out more pressure than it should. I never determined where my problem was coming from. Had lack of power trying to accelerate under a load when hot and it seemed to be flooding itself. The electric pump with pressure regulator solved everything which made up for my inability to resolve the mechanical problem properly.

[andrew honychurch]

That seems a strange conundrum in many ways. Lack of power under load would have suggested to me, if it definitely fuel related, that it was short of fuel but yet it was flooding. I would have thought problems therefore within the carburettor, but as you say an electric pump solved it it must have been fuel starvation. Perhaps as you were flooring it to kepp it going it was pumping what fuel it did have in the bowl through the accelerator pump and that was causing the flooding. Its a strange one, but as I said before, and from your experience, Carriers, well T16's anyway, are well known to suffer when hot. There is a guy I know who did his National Service on them, and said they were for ever stopping and couldnt be restarted. That said ( sorry to all you othe Carrier owners) when the T16 was working it was far the best of the bunch due to its power and better steering. But I digress and will no doubt be mown down for his views

[Lynn Eades]

I know nothing about the T16, but withe flathead ford v8, I believe the fuel pressure is supposed to be 2 1/2 psi. This is solely dictated by the spring in the pump. With higher pressures problems like flooding occur.
Volumne is another issue.
Even us mechanics easily confuse flooding and starvation.

[Marc van Aalderen]

Originally Posted by andrew honychurch

I am sure in the long run, the T16 will run better with a modern fuel pumping system in place.

Andrew,

Dirk Leegwater has NOS 6v fuel pumps. If you want I'll pick one up for you as you need the drive gear also. I'm going to Dirk in the next couple of weeks. Just let me know.

Cheers,
Marc

[andrew honychurch]

Thanks Marc, but as its a 12volt system I intend on putting a modern fuel pump in line. Been stripping the instrument panel this weekend, and need some items for that. I have all the guages, but I am in need of the small pop out red cut out, a siren switch, starter switch and a socket for the auxillary light lead. They all look like standard US style parts but carry a G166 part number and I am sure they are all different to the Universal carrier. Quite depressing trying to find all the stuff I need!

[Marc van Aalderen]

Your welcome. I did not know these were 12 volts. You learn something new every day on this great forum.

You still need the drive gear? Just making sure.

Cheers,

[andrew honychurch]

yes please, that would be great. thx