TRFD plunger depth

I want to check if the center plunger is at the proper depth. First, I will remove an injector fuel line, on top of the distributor, then run the fuel pump (no start). There should be no fuel coming from the hole. I will then move the air flow plate, and watch for fuel to be seen.

The question is: Should I see fuel with even the slightest movement of the plunger, by the plate? Or, should the plunger go up a little, before fuel is noticed?

Thanks

I just completed the above. Pushing the plunger in about 1/16 inch and no fuel. I had to push it in more then that, and then I saw some fuel starting to come out.

According to the drawings, of KE fuel systems, it appears that the plunger, at rest allows no fuel to enter the lines, however, fuel should start going in as soon as the plunger is pushed in.

Hence, it would appear that my plunger is sticking out too much, and that the plunger setting nut should be turned in more, to move the plunger more upward.

Does this make sense?

>>Does this make sense?<<

sounds right Henry.

JRV,

I turned the screw in 1/2 turn. With the FP on, there was fuel coming from the top hole, without depressing the air plate. I will now turn it out 1/4 turn.

The plunger depth is critical......if too low, then one will not have full power. If too high, then one will flood the engine at idle.

I will try to adjust it to where I am getting fuel, with any upward movement of the plunger, but not at rest.

I thank Jeff Green for giving me the initial settings.........I removed both plungers, without checking the original depth.

The space, between the rest and the contact point, of the air flow plate and the plunger, will be compensated for by the A/F mixture screw.

Henry,
There should be a small gap between the air flow plate and the plunger when everything in the resting postion. Check out http://www.autosite.com/garage/encyclop/ency07c.asp See the "Won't Hold" section
Brian

Thanks Brian..!

Good stuff Brian. I am aware of the gap. However, the plunger depth information is really ellusive, even in this article.

Through "analytical" thought, I proceeded as follows:

With a single injector fuel line disconnected, at the top of the FD, I ran the pump and adjusted the plunger nut to where a small amount of fuel would come out the injector hole.....vs, adjusting it to where there is no fuel, when the plunger is at rest.

The reason for this was that I wanted some fuel coming out at the plunger rest position, so when one lets go of the gas pedal, rapidly, one will not get hesitation, stopping, of the engine.....since this gas pedal position results in the plunger being at rest. With no fuel, then one is subject to some of the problems others have stated, regarding the engine RPM dropping, when the pedal is released quickly. This has happened to me, in the past.....however, only intermittently.

The 2mm space mentioned is easily adjusted to by the air/fuel mixture screw........that hole between the FD and air sensor. The final adjustment will be made with the CO analyzer.

What do you guys think? Are my thoughts rational?

Thanks

One thing you could do is plume a fuel gauge at the injector line port in the fuel distributor.

Prime the system and see what kind of pressure shows on the gauge. With the gauge still attached and no leaks are preasent start the car. Note the fuel pressure on the gauge.

As you know the injectors will not open until approx 45 psi. If your pressure reads low, then you know your sensor plate is not adjusted correctly, and will need further turning to open the plunger until right injector pressure is seen.

Remember,the vac of the engine on turn over is what moves the sensor plate down,thus pushing the plunger up in the fuel ditributor. That is why a small amout of free play is critical for these cars. If it's too tight engine vac can not pull the plate far enough down to allow air into the engine. If it is too loose not enough fuel will be added then you will have a no start problem, or a long crank time.

I have used this method a couple of times and it seems to get me in the ball park..at least the engine running on it's own with out dieing. Then you can proceed to set the car up with a 4 gas and get her running right on spec.

I've recently removed the fuel dist.s from my car and measured the depth of the nut at the plunger to be between .020" and .025" (that's inches). It was very hard to get an exact repeat number. But both sides were the same. I think my initial depth I told Hank was something like .018" to .023" or something.

Hi Jeff,

Thanks for the update. What have you been doing with your TR?........fuel problems?

I am now working on a no spark issue, of the right bank.

Oh, is this fun!!!!!!!!