Re: IML: Long Cranking Times/Fuel Draining Back

[RandalPark@xxxxxxx]

Some of my cars have encountered a serious starting problem when cold due to clogged "primer jets". I understand that this would not have much to do with the fuel "draining back" down the system, but it can cause just as much trouble starting the car once it has been parked for a day or two.

My '68 with the original style carb, also has the fuel "drain back" problem. It has a glass inline filter close to the fuel pump. I can see that there is NO gas in it once the car has parked over night. I will explore the condition mentioned here by Steve concerning the seals.

The other day, I noticed a "gurgling sound" at the rear after a short run. I removed the fuel filler cap and got a loud "whoosh". I am wondering if this suction could act pull the fuel back towards the tank until the pressure is gone. I plan to replace the filler cap to see if it has any effect.

Paul W.

In an email dated 30/8/2005 12:00:05 pm GMT Daylight time, "Stevan Miner" <miner@xxxxxxxxxxx> writes:

>What you have happening is the fuel is being siphoned out of the carb back 
>to the tank or into the engine after you shut the car off. On the Thermoquad 
>there are two small o-rings that seal the float bowl to the lid of the 
>carburetor at the bottom of the float bowl that are leaking allowing the 
>fuel out of the carb. Installing a new carb kit will remedy this problem.
>Steve Miner
>Miner Auto ?Service
>Winnebago, MN
>----- Original Message ----- 
>From: "Eric" <gearhead@xxxxxxxxxxxxxxxx>
>To: <mailing-list@xxxxxxxxxxxxxxxx>
>Sent: Monday, August 29, 2005 10:02 PM
>Subject: IML: Long Cranking Times
>
>
>> If ?the fuel system appears to hold a normal amount of fuel in a 
>> see-through fuel filter, other troubles could exist such as vacuum leaks 
>> and a slackened timing chain. I've had great improvements in start ups 
>> with the renewing of these parts. If a timing light shows a jumping timing 
>> mark, it's time to junk the nylon coated cam sprocket and replace it with 
>> a steel one and a new chain. Replace any vacuum hose that are hard and 
>> dried out. Minute cracking at the ends of dried up old hoses causes poor 
>> vacuum, and be sure to pull the carb spacer and thoroughly inspect. I had 
>> one that looked fine until I pulled it from the intake manifold where I 
>> could see the underside and just how riddled with cracks it was. If any of 
>> these parts are original to a 30+ year old car with >100k miles, it's time 
>> to do some replacement.
>>
>> Eric
>> Portland, Oregon
>> ______________________________________________________________________
>> for what its worth i have the exact same symptoms in my '74 Imperial; it
>> takes 4 cranks with pumping to start whether it sits for 24 hours or 6
>> months.its annoying but I live with it..it starts so much better in the
>> winter if you can call tampa having winter weather...I wonder if the 
>> bottom
>> of the bowl on the thermoquad is cracked allowing the gas to leak out...
>>
>>
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>
>
>
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