Restarting fuel supply after pump removal

[RogerH]

Hi Folks,

I have just replaced (this morning) the diaphragfm in a AC fuelpump from a TRiumph 2000 Mk2.   

The 4 pump is very similar to the 4A pump but it has the glass bol at the top.

The problem is getting the flow from the tank into the pump - it isn't.

I can get fuel up by me sucking on the pipe. And after doing this I get a couple of pulses into the pump but then it stops.

Back of the car is jacked up and I can fill the pump glass bowl from the carb pipes.

Any advice would be most welcome.

 

Roger

[Trev Good]

Roger, your problem is one of the many benefits of having a suction brake bleeder. Do you have one or can borrow one? If so, try undoing the fuel pipe from the carbs, if there is a flexible hose, undo there. Then by using the suction pump on the pipe draw the fuel through and see if that clears it.

Good luck

[Don H.]

Is there a gravity head from the tank to the pump on the TR4/4A, Roger?  On a sidescreen car gravity alone from a full fuel tank will largely prime the pump.

Does the Triumph 2000 AC pump have a priming lever?  

Clear lines between pump and tank?  One-way valves in the pump oriented the same was as on a TR?  Pump lever positioned correctly on the cam?

[BlueTR3A-5EKT]

Roger.

If this is a saloon 2000 the tank is where a TR tank is so gravity is your friend.  If it’s an estate the tank is under the rear floor next to the spare tyre.   Have you primed the carb float chambers through the fuel lines with a syringe and got the car running.  If so they usually self prime once started.

I have a Mityvac if you want to borrow it.  Not home till Tuesday though.

[RogerH]

Many thanks for your quick responses.

I do have a suction pump and will attack thge carb pipes when I go back out.
it is an estate.
Pump lever checked and double checked.
Is it possible to replace the top if the pump so that the one way valves are the wrong way.

Lets see what happens.

Roger

 

[Z320]

Hi Roger,

browsing the web the bowl on top is metal and one bolt holts it in position?

Knowing nothing I would hold the bowl manual down, slack the nut for bleeding and see where petrol comes out.

Ciao, Marco

[Lebro]

Are the valves in the pump sealing properly ?

Bob

[RogerH]

Hi Folks,

  thank you all so much for your suggestions.
In the end it was a school boy error.  The top fuel bowl section had been replaced 180' out.

However it is not starting so tomorrow I investigate sparks etc.  The car is a nightmare.

 

Roger

[RogerH]

Hi Folks

I got the bl**dy thing started and running not too bad,

One would think that a standard N9Y sparky would have  zero Ohms between the top cap and the bottom electrode. Not so.
one of the six was completely open circuit. 4 others had high resistance - 100K
two were very low 50 Ohms or so.

I had some NOS (apprcx 50 years old)   Two were zero Ohms.  One was Open circuit and the last of the 4  had an issue with the thread on the top stopping the nipple screwing down.

The electronic dizzy had quite burnt contacts that the rotor aligned with but cleaned up well.

The carb air filters were very badly bunged up.

Any way it started and tomorrow the owner will be making an appointment with a garage for a service and some repairs. 

 

Roger

 

 

[Lebro]

I have recently found the same with some spark plugs - open circuit from tip to tip, have yet to read an explanation.

Bob     They seem to work though !

[RogerH]

Hi Bob

I have the explanation.  A couple of months ago I broke open a Champion L87YC.
The top with the nipple has a thread like fitting that screws into the unbaked ceramic.
This then makes contact with the centre electrode that is already set in place. And then is all cooked and glazed.
So they should be in contact, but.   Even if it is 1/2 a gnats amiss then it will be open circuit. But the 20Kv will easily jump it.

One of my NOS N9Y's yesterday was open circuit for this reason I am sure.

How many owners check their plugs for opencircuit electrodes.!!!!

 

Roger

[PodOne]

Interesting explantation Roger.

I've never tested plugs to that extent and instead just replaced the lot with new plugs if I have had reason to suspect them. The question now is are the new plugs always perfect?

Andy