{CARB-SWAP}Newest theory..

[Grand Marquis GT]

Jon mentioned that cause of ,my setup, my fuel bowl will emppty itself overnight, so I figured out how to get the car to start..

Turn the key on, without cranking for around 10 secs...allow the fuel pressure to fill the fuel bowl.

It will fire right up.

But I still have a problem with the car bogging right out at mild acceleration 1/8-1/4 throttle. my timing is dead on. idle sucks too. Sounds like its got a miss. I may change the plugs later.

What does everyone else think?

When warmed up, and I stomp it, it will get right up and go!

[Ifixyawata]

I think the problem stems from trying to make the carb play friendly with the stock fuel pump. I'm not saying it can't be done, (you've proven that it can by about 99%!) but your setup is more complicated than a standard external electric pump, etc.

[bruno]

Re: Newest theory..

Turn the key on, without cranking for around 10 secs...allow the fuel pressure to fill the fuel bowl.

It will fire right up.

Is ths tested out by an independant contractor?


No, but seriously, this works?

[Mercracer]

Re: Newest theory..

Jon mentioned that cause of ,my setup, my fuel bowl will emppty itself overnight, so I figured out how to get the car to start..
Turn the key on, without cranking for around 10 secs...allow the fuel pressure to fill the fuel bowl.
It will fire right up.


When warmed up, and I stomp it, it will get right up and go!

There is no reason for the bowl to empty. Why do you think that it is? It cannot siphon back. The needle and seat is on the top. If it hesitates when cold and runs great when warm....................welcome to the world of a carburetor!! Now you know why people go to EFI for a daily driver.
You need to get your choke set and working. You need to set your mixture screws with a warm engine.
Are you pumping it when it is cold to start?

[grandpaslincoln]

The 2150 has what's called an Enrichement valve ( or power valve). It is located underneath the fuel bowl. It is a vacuum operated valve. When your car is under heavy load, say when going up hill, and you have the throttle opened way up or at WOT, the valve loses vacuum, letting it open. When it does this, it allows more fuel into the main fuel wells through a passageway, enrichening the mixture. When the throttle is closed more, there is more vacuum, thus the valve closes and shuts off the fuel flow to the enrichement circuit. When you shut the car off, the vacuum ceases, and the valve opens back up. After a while, the fuel slowly leaks out and down the throat of the carb. It is completely normal, and the only thing I can find wrong with using the 2150.

My car also runs like shit when I first start it up, but the engine smooths out when she is all warmed up.

[gadget73]

Wait, it's NORMAL for the fuel to leak out of the bowl on this type of carb? Wow. In anything else that's a sign of internal leakage meaning the carb is about screwed.

The bog at light accel coudl be the accelerator pump not pumping enough, or maybe too much. Try changing which hole the linkage connects to (I assume those things have such a device?)
If the idle also is crappy, you might need to tweak the mix screws. usually about 1.5 turns out is a good place to start, but ideally you should tune with a vacuum guage connected to get it to the highest reading, then re-adjust the idle set screw to get around 700 rpm hot idle. If the fuel mix is too far out, especially if it runs lean that will cause a hesitation between the low speed circuit and the high speed circuit (about 1/4 throttle). The mix screws should be set evenly too.

[Mercracer]

When you shut the car off, the vacuum ceases, and the valve opens back up. After a while, the fuel slowly leaks out and down the throat of the carb. It is completely normal, and the only thing I can find wrong with using the 2150

What is a while?
I have one of these carbs sitting on my bench. It looks like it relies on the venturi vacuum to draw fuel from the area around the power valve. If this is true that is seeps out, I can't believe that Ford would put such a bone headed design into service. I'll have to fill my carb up with fuel and wait and see if the bowl empties before I will believe it though.

[grandpaslincoln]

I have no idea how long it takes. I've had two of these that have done it. The first on was a peice of shit, and this brand new reman that I have does it too.

[trwp72]

moved to CORRECT FORUM!!!

[phayzer5]

Heh, Tom! you're not old enough yet to forget which thread you're posting in :lol:

[trwp72]

post

No just a long friggen night here at work.... GEEEZ.... I'll move it... Thanks....

[Grand Marquis GT]

Well, the damn thing quit for a few min on my this morning.

I get out and piss around under the hood, and my module is HOT AS FUCK! the coil isnt even that warm, and its right by the fuckin motor!

Today I will write down the wiring I have done. I am using a van distributor, and van module. The colours are all whacky, and if you have them mixed around, you wont get ANY spark. wtf?

So there has to be only one way to wire them, or it wont fuckin work.

I hope when I call my insurance co., they total the fucker. im getting sick of this shit. :nonono:

[phayzer5]

Add a better ground for the module. The only ground it gets is through that black wire to the dist and into the block.

[grandpaslincoln]

Somethings definately up. It shouldn't get that hot at all.

[Mercracer]

Add a better ground for the module. The only ground it gets is through that black wire to the dist and into the block.

I was thinking about the ground at work today. The module for 351W CV cars is mounted to the plastic inner fender, and I don't remember seeing any additional ground wire/strap for it. I have some pics on my PC, and I do not see any ground straps/wires coming from the box. The Duraspark II is a simple system, so it has to be a simple problem. I have done a pile of points to DII conversions and 2 CFI to carb DIII to DII conversions with no problems. I have always mounted the module to metal though, so it is possible that ground could be an issue with your setup, but going by the 351 cars I have seen, I am not sure why it would be. I still have not found ANY application that uses different colored wires or calls for a different distributor module for a DII system. That part has me stumped so far.