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Old 12-01-2012, 01:34 PM   #1 (permalink)
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Default Fuel Pump question

Got a 69 coupe with 302 that doesnt want to start
it doesnt seem to be getting fuel
is there any sure way a novice mechanic can test for a bad fuel pump
i tried disconnecting the gas line just before the carb
turned the engine over a few times while pumping the gas a bit
didnt get any gas out of the fuel line

is this a tell tale sign i need a new pump or should i try something else to be sure
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Old 12-01-2012, 01:38 PM   #2 (permalink)
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I had this problem with my last two pumps, both holleys. If car sat for longer than two weeks I would pretty much have to poor gas in carb to prime it so it would run long enough to get the pump going faster. Both pumps were less than 3 years old when this started.

I stepped up to a eddy victor junior with a regulator at carb and haven't had a problem since.
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Old 12-01-2012, 01:42 PM   #3 (permalink)
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Got a 69 coupe with 302 that doesnt want to start
it doesnt seem to be getting fuel
is there any sure way a novice mechanic can test for a bad fuel pump
i tried disconnecting the gas line just before the carb turned the engine over a few times
This is one way to tell, although if the pump works you'll have gas all over the place.

while pumping the gas a bit
This will do nothing at all, since the pedal is connected to the carb, not the fuel pump.

didnt get any gas out of the fuel line
OK, either the pump is shot, the fuel line is blocked, or the gas tank is empty.

is this a tell tale sign i need a new pump or should i try something else to be sure
Run a hose from a gas can to the pump inlet and try again.
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Old 12-01-2012, 02:21 PM   #4 (permalink)
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I had this problem with my last two pumps, both holleys. If car sat for longer than two weeks I would pretty much have to poor gas in carb to prime it so it would run long enough to get the pump going faster. Both pumps were less than 3 years old when this started.

I stepped up to a eddy victor junior with a regulator at carb and haven't had a problem since.
That is pretty much the same problem i have,,, tuff to start after sitting
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Old 12-01-2012, 02:29 PM   #5 (permalink)
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Originally Posted by 22GT View Post
Got a 69 coupe with 302 that doesnt want to start
it doesnt seem to be getting fuel
is there any sure way a novice mechanic can test for a bad fuel pump
i tried disconnecting the gas line just before the carb turned the engine over a few times
This is one way to tell, although if the pump works you'll have gas all over the place.
Nope,,, no spillage,, no gas

while pumping the gas a bit
This will do nothing at all, since the pedal is connected to the carb, not the fuel pump.

didnt get any gas out of the fuel line
OK, either the pump is shot, the fuel line is blocked, or the gas tank is empty.
tank is about half full
i think the line should be ok,,, it has run fine once started

is this a tell tale sign i need a new pump or should i try something else to be sure
Run a hose from a gas can to the pump inlet and try again.
i removed the inlet line,, very few drops of gas dripped
i didnt have a fuel line long enough for the test though

not sure... but my pump might be original to the car
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Old 12-01-2012, 02:33 PM   #6 (permalink)
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Impressive. Don't throw it away. Some show-car guy might give you a few bucks for it.
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Old 12-01-2012, 03:37 PM   #7 (permalink)
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Impressive. Don't throw it away. Some show-car guy might give you a few bucks for it.
if i do get a new pump,, and mine is original
you are welcome to it for the cost of postage from Canada
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Old 12-01-2012, 03:40 PM   #8 (permalink)
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Originally Posted by 1966notch View Post
I had this problem with my last two pumps, both holleys. If car sat for longer than two weeks I would pretty much have to poor gas in carb to prime it so it would run long enough to get the pump going faster. Both pumps were less than 3 years old when this started.

I stepped up to a eddy victor junior with a regulator at carb and haven't had a problem since.

I did pour gas into the carb and it fired up right away,, then stalled
tried it again with a few more revs when it started and it is still running now

should i buy a new pump
and where do you purchase the pumps that you mentioned available
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Old 12-01-2012, 05:05 PM   #9 (permalink)
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Chances are you have some junk in the fuel tank that is plugging the "sock" that covers the end of the fuel pick-up to prevent chunks from getting into the fuel line. Pretty easy to check if you can use/drain the fuel from your tank and pop the sending unit out, then look at the end. New "socks" are available. Also take a peek in the tank for rust, etc., and address/replace as needed.

PS: IIRC, those original pumps ARE rebuildable.
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Old 12-01-2012, 08:03 PM   #10 (permalink)
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Chances are you have some junk in the fuel tank that is plugging the "sock" that covers the end of the fuel pick-up to prevent chunks from getting into the fuel line. Pretty easy to check if you can use/drain the fuel from your tank and pop the sending unit out, then look at the end. New "socks" are available. Also take a peek in the tank for rust, etc., and address/replace as needed.

PS: IIRC, those original pumps ARE rebuildable.
I had the sending unit out a few months ago to check why my gas gauge wasnt working,,, the sock looked new
at the time i changed the locking and o rings
gas gauge works now

i have only had the car bout 6 months now
i drove it a lot in warmer dryer weather,,, now that its getting colder i only drive on dry,,, saltless road conditions,, i cant believe we had salted roads once already this year... inch and a half of snow and they salted (geeeesh) it was all melted by afternoon
anyhow,, ever since the car had sat for a week at times,, it became hard to start,,, the choke works fine and closes almost fully at start
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Old 12-01-2012, 08:06 PM   #11 (permalink)
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I had the sending unit out a few months ago to check why my gas gauge wasnt working,,, the sock looked new
at the time i changed the locking and o rings
gas gauge works now

i have only had the car bout 6 months now
i drove it a lot in warmer dryer weather,,, now that its getting colder i only drive on dry,,, saltless road conditions,, i cant believe we had salted roads once already this year... inch and a half of snow and they salted (geeeesh) it was all melted by afternoon
anyhow,, ever since the car had sat for a week at times,, it became hard to start,,, the choke works fine and closes almost fully at start
Guess number 2 is that the vent on the fuel cap is plugged.
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Old 12-01-2012, 08:07 PM   #12 (permalink)
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if i do get a new pump,, and mine is original
you are welcome to it for the cost of postage from Canada
Please post a picture.
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Old 12-01-2012, 08:47 PM   #13 (permalink)
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Guess number 2 is that the vent on the fuel cap is plugged.
i thought of that and removed the cap when i was trying to start it earlier today
no luck with cap on or off

after i got it started with pouring gas in the carb i let it idle for 20 or so minutes,, then shut her down

bout an hour later i started it back up,,, it started immediately,,, so the wife and i went for a 20 minute drive to staples then a 20 minute drive back home
everything went well
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Old 12-01-2012, 08:50 PM   #14 (permalink)
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Please post a picture.
its still in the car,,, so im not sure how it will turn out but i can try to get a pic for you tomorrow
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Old 12-01-2012, 10:46 PM   #15 (permalink)
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Yeah my pickup was clean as well, also had new gas tank, new 3/8 fuel line, new filter and tried taking cap off too.

I bought my pumps all from summit racing, but if your car is all/mostly stock I would just buy a stock spec one from any mustang parts house NPD, G/N etc...

If you do go for a high performance pump, make sure you get one that is either self regulated or buy a regulator as well and be prepared to do some fabing and get a gauge.

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