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Re: Still having to prime my carb to get my car to start [Re: Sixt8Chrgr] #2571656
10/30/18 04:07 PM
10/30/18 04:07 PM
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Michigan
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BlueRacer69 Offline
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Not to highjack this thread, but does anyone make a good aftermarket fuel pump push rod with harden ends these days? Suggestions. I could use one myself. Thanks.

Re: Still having to prime my carb to get my car to start [Re: Sixt8Chrgr] #2571932
10/31/18 01:26 AM
10/31/18 01:26 AM
Joined: Jan 2003
Posts: 21,473
N.E. OHIO, USA
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Simple vacuum leak in the fuel line, like a cracked hardened rubber fuel line, loose hose clamp, bad gasket at the tank pick up, bad vapor separator, too low float level, weak accelerator pump or restricted accelerator pump passages. Shouldn't the fuel line stay primed all the way to the fuel pump and the carburetor float chamber(s) stay full from when the engine is shut off. Check the accelerator pump function before you attempt to start it the next time after it's been sitting it should pump plenty of fuel if it has fuel in the carb

Re: Still having to prime my carb to get my car to start [Re: Sixt8Chrgr] #2571933
10/31/18 01:30 AM
10/31/18 01:30 AM
Joined: Jan 2003
Posts: 21,473
N.E. OHIO, USA
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Originally Posted By Sixt8Chrgr
This is getting real old. I thought the fuel pump was bad. Changed out the Precision Pump for a nice Carter M6903. Still when the car has sat for a long time the pump is not getting fuel to the carb while trying to start it. Only after the car fires after the carb is primed does the pump have enough pressure to get the fuel to the carb. Car is freshly restored except for the fuel sending unit.

Could it be the fuel vapor canister? This is new

Bad fuel sending unit? I did not replace this when I restored the car.

Thanks

Lawrence



speaking of fuel vapor separator weren't there some bad ones out there that didn't work correctly? Bypass it and see if that's your problem.

Re: Still having to prime my carb to get my car to start [Re: BlueRacer69] #2571971
10/31/18 06:53 AM
10/31/18 06:53 AM
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tman Offline
mopar
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Originally Posted By BlueRacer69
Not to highjack this thread, but does anyone make a good aftermarket fuel pump push rod with harden ends these days? Suggestions. I could use one myself. Thanks.


Check out this thread and scroll down. Person sells oem mopar fuel pump rods.

https://board.moparts.org/ubbthreads/ubbt...tml#Post2515947

Re: Still having to prime my carb to get my car to start [Re: Centerline] #2572808
11/01/18 11:20 PM
11/01/18 11:20 PM
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NC
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Sixt8Chrgr Offline OP
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Originally Posted By Centerline
Today's Ethanol laced fuels evaporate at a much higher rate than normal "gas" and that is your problem. If you let the car set for more than a week all the fuel in the carb will evaporate and you wind up having to crank the engine for a while to fill the bowls again. You don't find this problem with fuel injected cars since they all use electric pumps and run on high pressure. You also won't find this problem with a carburetor setup when using an electric pump.

With the crap we have for fuel now days you basically have three choices. Change to an electric pump and eliminate the mechanical pump, add an electric pump with a check valve to bypass the mechanical pump so you can fill the bowls before starting, or fill the bowls manually before starting.

Those are pretty much your options. Good luck.


I don't run Ethanol fuel only real gas.

Re: Still having to prime my carb to get my car to start [Re: Sixt8Chrgr] #2572815
11/01/18 11:24 PM
11/01/18 11:24 PM
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Posts: 177
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Sixt8Chrgr Offline OP
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I know I have a bad fuel sending unit so am going to replace and see if that helps. Perhaps a vacuum leak in the line? When I change the sending unit I will check the hose clamps. All the rubber hose is new.
I hear you on the fuel push rod...I will first check the easier things then move to that.

Thanks for the help

Re: Still having to prime my carb to get my car to start [Re: Sixt8Chrgr] #2573087
11/02/18 04:11 PM
11/02/18 04:11 PM
Joined: Jan 2003
Posts: 7,538
Albany, NY
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The member whose name is actually Art
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The member whose name is actually Art

Joined: Jan 2003
Posts: 7,538
Albany, NY
Hey - another possibility - it could be your fuel pump pushrod is worn down so it hardly pumps until the engine is running at higher-than-cranking rpms.. Just a suggestion.

There is an allen screw in the block under the fuel pump, pull it out and the fuel pump, then the pushrod drops out, check for length. I have a post about it somewhere here.

I had the same basic issue, really hard to start, excessive cranking after parked for a week, had to keep filling the bowls manually before starting.. and in hindsight I had intermittent fuel starvation too... The fix cost $16 and took 20 minutes.

But - I still refill the float bowl with a squeeze bottle so I don't have to crank the 20 seconds first. Now it fires up nicely and stays running.

Best,
- Art


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Re: Still having to prime my carb to get my car to start [Re: 71birdJ68] #2573979
11/04/18 05:31 PM
11/04/18 05:31 PM
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bboogieart Offline
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Originally Posted By 71birdJ68
Just the way gas is now a days. If my car sits more than 2 days I have to crank it to fill the bowls.


Not sure I agree.

Been running the Ethanol (garbage?) for years.
My 76 truck and 77 van start right up after two pumps on the gas pedal.
Sets choke and adds fuel.
Sometimes they sit for months at a time.
Maybe it's the low compression but they always fire right up.

I have a 75 Cordoba that needs a shot of fuel dumped down the carb.
I think the Dobies trouble is sticking front brakes.
The heat created boils out the fuel after shut-down.

Come spring I'll do a brake job, then I'll know the outcome.


I have mechanical Aptitude.
I can screw up anything.
Re: Still having to prime my carb to get my car to start [Re: Sixt8Chrgr] #2574156
11/04/18 11:31 PM
11/04/18 11:31 PM
Joined: Mar 2003
Posts: 5,193
NEW JERSEY
AARCONV Offline
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NEW JERSEY
How about installing 2 clear fuel filters, 1 between the pump and carb and 1 before the pump..run the car till both is filled up, then shut it down and see which filters go low in fuel

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