STALLS AT IDLE

james124 · Post by **james124** » Sun Nov 15, 2009 9:14 pm

I have a 74 spider with a stock 1756 cc engine equipped with a stock IDF 40 and stock electric fuel pump. The car starts up alright with the choke and turns over well in the 4,000 rpm range. However, after several minutes in idle it sputters, seems to starve for fuel and then stalls completely. It has done this at least ten times. It was running pretty good before. I have installed new plugs, new fuel filter and cleaned out the carb filter (very clean). The carb is fairly new and seems very clean. I would appreciate getting your insights and guidance before puling the carb apart needlessly.

So Cal Mark · Post by **So Cal Mark** » Sun Nov 15, 2009 10:05 pm

you've got a single idf40? and it idles at 4k? Just want to be clear on the info you're given

james124 · Post by **james124** » Mon Nov 16, 2009 1:30 pm

Sorry Mark, I meant stock double 40IDF's. The engine operates normally in the 4,000 rpm range with the gas pedal pressed. However, when you let go of the gas, it idles for a couple of minutes, sputters and stalls. It does this repeatedly. I also forgot to mention that my spark plugs get carbonized pretty quickly. Thanks for your insight and guidance. James G

So Cal Mark · Post by **So Cal Mark** » Mon Nov 16, 2009 3:32 pm

the first thing I'd look at is float level, it sounds like fuel might be dumping in from the main discharge nozzle at idle.

james124 · Post by **james124** » Sun Nov 22, 2009 6:40 pm

So Cal Mark wrote:the first thing I'd look at is float level, it sounds like fuel might be dumping in from the main discharge nozzle at idle.

Re: almost stock 74 Spider

Thanks Mark. I installed a transparent fuel line between the carbs and realized that I was not getting fuel and traced the problem back to the fuel pump. It operated when the ignition was cranking but stopped when the ignition went to run mode ( or ACC.) Consequently ,it filled up the carb at crank and the car run just enough to finish the fuel contents of the bowls and starved after that. Once I connected the fuel pump directly to the battery it ran fine. It has now become an electrical problem and I will attempt to figure out how to fix it. If you have a suggestion, I would be grateful. Thanks again, James G.

So Cal Mark · Post by **So Cal Mark** » Sun Nov 22, 2009 7:02 pm

is it an original electric fuel pump or a conversion?

james124 · Post by **james124** » Sun Nov 22, 2009 8:13 pm

So Cal Mark wrote:is it an original electric fuel pump or a conversion?

It's the original mounted next to the gas tank. All the wiring and relays are original stock. Thanks, JamesG

So Cal Mark · Post by **So Cal Mark** » Sun Nov 22, 2009 9:19 pm

only asking because the original system used a relay, and most add-ons are wired direct to the ignition switch

STALLS AT IDLE

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