Stalling help

[75ranger]

OK. Replaced the fuel pump and am still getting a sputter and eventual stall when getting on the throttle(only when driving). Hard throttle when in park seems fine. Is it a vacuum leak? Had no issues until a few months ago.

Thoughts?

 

[DirtDonk]

Sounds similar to what you get when a fuel filter starts clogging up.
When you did the pump, did you also change the filter? What carb are you running?
And trace the fuel lines back to the tank to make sure that there are no additional filters that might be clogged up also.

Paul

 

[DirtDonk]

A vacuum leak would effect your idle quality too. How does it feel while idling? Under normal light acceleration?

Paul

 

[SteveL]

fuel filter? Some carb cleaner to the carb and linkage in case something's sticky. It will also show a vacuum leak if idle changes spraying outside.

 

[75ranger]

I changed the fuel filter when it first started doing it several months ago. Didn't fix it so I went after the fuel pump. Found a cracked hose from the hard line to the pump so that was replaced. Also replaced the hard line from the pump to the carb.

I am stumped.....

 

[75ranger]

Idle seems to be OK but it doesn't take much throttle to make it stall. It almost works better when I step on it than just lightly hitting the gas.

 

[DirtDonk]

What about your vacuum advance? Is it attached to the ported-spark fitting, rather than full manifold vacuum? I've seen engines that would stall under light acceleration when plumbed like this.

And if not, what is the state of tune of the engine? Been awhile since a tune up or carb rebuild? Or is it relatively fresh?

A weak spark can do it too. Are you running points still, or electronic? Since it's a '75, presumably it's got a Duraspark setup? Fading magnetic pickup in the distributor maybe? You can easily test it with an ohm-meter, but I forget the specs you're looking for. Within a certain range though, they're still good. Outside of that range and it should be replaced. Even if it's not the root your problem.

Just some more suggestions to get you started.

Paul

 

[lasadoor]

spray some cleaner on your carb to find any leaks, pull your plugs and check their condition. might consider a mild rebuild on the carb just to clean it out and reseal it.

 

[Broncosis1973]

Having exact same issues with my 70. Stock 302 and autolite 2100. Been sitting all winter, was running great when I put her to bed last year. Put sta bil in the tank as a precaution. Changed the pump, filter, installed pertronix and fiddled the every adjustment on the carb. Vaccuum advance seems ok, will check plugs and leaks tomorrow. Might just be bad gas even with the stabil. I'll let you know when I find the fix.

 

[Broncosis1973]

Ok, got it figured out. I did replace the vacuum advance, but that wasn't it either. Took off the carburetor to my workbench (tailgate) and took it apart. Took off the top and there was a bunch of crystallized residue in the fuel bowl. Took apart the rest of the carb and blew out all the passage withs carb cleaner. There was more of this gunk in the venturi as well. I was so sure it wasn't the carb, since it was rebuilt just last summer and I could see good streams of fuel going into it. I guess what happened is the fuel evaporated and left behind the crystallized gunk, just like a bowl of sugar water etc. Either its the stabil or just all the additives they're putting in gasoline these days, but I'll be sure to clean out the carb before it goes into storage again. Here's a useful link for the carb rebuild. http://www.therangerstation.com/tech_library/pdf_documents/motorcraft_2150_carb.pdf

 

[Skiddy]

Ok, got it figured out. I did replace the vacuum advance, but that wasn't it either. Took off the carburetor to my workbench (tailgate) and took it apart. Took off the top and there was a bunch of crystallized residue in the fuel bowl. Took apart the rest of the carb and blew out all the passage withs carb cleaner. There was more of this gunk in the venturi as well. I was so sure it wasn't the carb, since it was rebuilt just last summer and I could see good streams of fuel going into it. I guess what happened is the fuel evaporated and left behind the crystallized gunk, just like a bowl of sugar water etc. Either its the stabil or just all the additives they're putting in gasoline these days, but I'll be sure to clean out the carb before it goes into storage again. Here's a useful link for the carb rebuild. http://www.therangerstation.com/tech_library/pdf_documents/motorcraft_2150_carb.pdf

if it was white it would be caused by ethanol more than likely

 

[Broncosis1973]

Ranger, should mention too, pull your plugs and clean or replace. Mine were oil fouled from running it rich while diagnosing. Good luck!