78 f150 ranger XLT 302 w/2bbl I need any help i can get on this vacuum problem. basic stuff to the most ya got i am on foot here. would be nice to get it running before i lose my job

 

I'm thinking "vacuum problem" is a little vague. Do you have ANY description of the problem?

 

the truck sat for 7 years has rotten rubber strings everywhere
i have hooked up what i can and plugged off what i dont know where to hook up. the truck runs but wont move. a complete set of diagrams for that configuration is needed or someone who has actuall knowledge of this configuration

 

Vacuum Problem? Sounding more like a transmission problem. Can you be more descriptive?

 

the truck runs but loses all power when i stick my foot in it

 

I dont have any diags but if you need to find a vacuum leak spray some carb cleaner around the base of the carb and intake manifold and any other place you suspect a leak. listen for a change in idle. Yes this can be dangerous so do not perform unless supervised by an adult!

 

i think i found it thanks for the help
a kid just drove up in an identical configuration we are redoing the entire system give me a pattern and i can build anything

 

mario56,
If the truck is that old, and vacuum system deteriorated, you may wish to invest a few dollars in new hosing first. The vacuum system on these old trucks were relatively simple compared to today's vehicles, and the vacuum diagrams can be found on the AutoZone website, autozone.com. After installing the new hoses, listen for signs of leaking, hissing.

From the sound of your problem, this is a big leak! You should be able to locate it by spraying WD40, or some other type spray lube, around different areas of the intake manifold, if the idle speed changes, you found a leak.

One area often overlooked, is the EGR valve. If this is stuck open during idle, it will give you the same symptoms. The EGR valve can be easily checked by removing the valve, then applying vacuum on the diaphragm to see if the valves plunger opens and closes correctly. If stuck, or if clogged by excessive carbon, clean with a an old toothbrush and some spray carb cleaner. Install with a new gasket, which costs approx. $1.00.

Since you said the vehicle has been setting for some time, you may wish to remove the air cleaner and look down the throat of the carb, while actuating the throttle. Verify that the accelerator pump is spraying gas into the carb. Without this shot of gas, the engine will lean out when the accelerator pedal is depressed. If you don’t see a spray, you will need to take the carb off and clean it out. If you suspect this is your problem, I have a little trick to verify it.

Please write back and let me know if any of this helped your situation.

Best of luck,
John24255

 

it was vacuum. a freindly soul drove up with the twin in working condition. the lil blue baby is running for now not finished with it yet. i replaced the fuel tank pump filter and rebuilt the carb with a new inline flo pro fuel filter mounted on the fender

 

Just curious, but didn't your carburetor already have an inline fuel filter on it?

 

mario56,
Awesome! Glade to hear another old Ford is back on the road again. Sounds like the making of a good country song! Since you found the leak, perhaps you could share your discovery with the rest of us. What did you find and what caused it?

Happy Motoring!
John24255

 

i found a whole bunch of rags and ribbons that were supposed to bea vacuum system
the truck sat for 10 years and i am bringing it back to life
new fuel tank, lines, pump, just rebuilt the ol 2bbl fomoco,carb.
but with nothing at all to work with for any of the rubber lines under the hood. i played plug this and move that for two months
then a kid down the block drove up with the identicle twin to look at. with a map to work from .the actuall work took about 2 hours
but it is up an running now

 

yes it does have an inline in the carb
but i got tired of replacing them
this one on the fender is as easy to clean as an old settling bowl