fuel starvation question

just curious if someone could tell me how a vehicle acts going into fuel starvation while driving

 

acts like the engine shuts off momentarily, or bucks or coughs.

 

I had a drag car that would backfire thru the carb due to low volumn of fuel. Normal Norman

 

ok after it coughs , bucks and dies how would it start ? does heat (hot engine) play a factor? if so how?

 

Fuel starvation due to a clogged fuel filter or weak fuel pump,

You can go up to a certain speed normally but if you try to go faster the engine poohs out like you ran out of gas. Slow down and it runs normal again.

 

My 351 acted like it was on a rev limiter.... it went and just stopped making power, it was very noticeable

 

It could be the hot engine...it could be vaporlocking, which can initially act like a plugged filter...It won't restart until you break the vapor lock...comes down to shielding the carb and lines from the heat.

 

what kind of vehicle, a bad fuel pump or pluging fuel filter will allow the float bowl to be ****ed dry and the engine dies till the bowl refills, usely all you have to do is take your foot off the pedal and allow the engine to return to idle, going up a hill is usely where you first notice this problem, a pluged fuel line caused by rust in the tank can shut the engine down and no fuel will flow till the rust falls down to the bottom of the fuel filter, then fuel can p*** again till the rust gets ****ed back up, this can take 15 min or more of driving, then you wait for 15 min or so and you can drive again for 10 or 15 min.

 

its a o/t f100 (72) with a360 fe in it with

new fuel lines from tank to carb new fuel pump/ filter, newer carb, shielded carb, wrapped fuel lines from before the pump to the carb , fuel lines ran on outside of frame completely out of the heat , took sending unit out of tank looked inside it with a flashlight everything looks clean and shiney blew compressed air into tank through pick up tube

in the morning im taking the tank out and throughly checking it out i am complelty out of ideas

it was originally a 2bbl it now has a edelbrock 500 cfm 4 barrell and performer 390 intake i also put a timing chain and gears in it

oh and the ignition is completly new

 

dang, beat me to it!

 

so if your truck is dies while driving and then does not want to start try pouring a little gas down the carb, if it fires right up then it would be a gas problem.

 

how hot should a coil be (get) if its mounted on the inner fender

does any one know if there may be a resistance wire somewhere under the hood of this truck? that could be bad


i took the tank out today drained it its compelety clean inside

it still acts the same any ideas????????????? i AM COMPELETLY OUT OF IDEAS

 

check your rubber gas line sections, they can appear good but be separated and collapsed inside.

 

I'm definitely not the expert but if you look for "283 running issues" you'll find all the things I tried to fix the same problem. The one wiring issue that I haven't fixed yet is the wires in the distro from the distro to the coil.
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Good Luck!

 

A coil shouldnt get hot..

Perhaps the fuel tank breather is pinched. Try runnin it with the cap loose. If you tried this, and I missed the post, sorry for being rodundant...It happens alot on these threads.

 

ok all the fuel lines and i mean ALL are new ive tried running with no fuel cap no difference i blew air through all the gas tank vents today all were clean and flowed just fine

i mounted my coil on the inner fender cause i thought my coil was getting too hot while mounted on the intake but its still getting atleast extremly warm on the inner fender (2 different coils by the way)

i really appreciate any help and or ideas cause as i said im out of them

 

Maybe try a lower therm or flush the cooling system?

 

any one else care to guess?

 

might be a better idea to tell us what your vehicle is doing.

 

well it was running fine then either after a certain length of time or when it got hot it nwould start coughing then die then it would take forever to get it to start agin

now just to get it to start is a monumental task unless its cold

i took the fuel line off the carb and cranked it and i think its getting plenty of fuel to the carb

 

Try a new capacitor. I went thru similiar troubleshoot and when the engine was cold the capacitor did fine as everything heated up the capacitor must've gotten a short but just screwed the ignition. Stuck another one in and it is ready for action.
Its an easy thing to change, esp with the coil getting warm.
Also check your circuit resistance, i am told the circuit need about 3ohms total. So test your coil and if it is say 1.5 ohms then you need to add another 1.5ohm resistance, might be the circuit is drawing too much current and that is why the coil is getting overly warm.
I believe it is easier now to get a mismatch on points type ignitions because we ***ume whatever is avaiable hanging on a supply house wall it is what we need. In the old days we'd get the stuff for a particular application and the supply houses had tons of that stuff.

 

oj, by capacitor do you mean the condenser for the points?

 

I had a similar problem with my 64 Cadillac with a 429 and a Carter AFB, but I'm not sure my issue would apply to your vehicle (I know nothing about those Ford motors).

In short, my heat riser was stuck shut and on the 429 (and other cadillac motors), exhaust travels through the intake from one bank to the other to heat the carb up when cold. In addition, the previous owner had removed a metal shim needed between the carb and the intake causing exhaust gas to directly contact the underside of the carb.

Anyway, within a few minutes of running the carb got so hot that the gas would just boil and it would cease to run.

Not sure that helps at all, but ya never know.

 

My blower motor blew the head gaskets

 

Yup, thats what i mean.

 

so have you tried pouring gas down the carb after it dies, that would tell you if it really is a gas problem.

 

yes ive done that it naturally acts like its flooded then after cranking forever it starts and burbles and then i have to stand on it to clear it out


then it idels fine until i put it in gear or touch the gas pedal then it dies and im back to cranking over and over and over again

 

That's what mine was doing before I blew out the lines and cleaned up my plugged filter.

 

when your engine dies does it still have good spark? if its not fuel spark is next. is it hitting on all cylinders and at the proper time?

 

is your carb tuned correct and are your ****erflys open when it warms up?