 Hard start, after running, 1.8 duel webbers |
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| SUNAB914 |
 Jul 23 2012, 07:02 AM
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#1
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Senior Member  Group: Members Posts: 698 Joined: 29-December 08 From: Fredericksburg VA Member No.: 9,880 Region Association: South East States  |
Looking for some experience here on this issue. After quick or long runs my 1.8 duel carb is very stubborn to restart. It acts like flooding, but I have to pump gas pedal like hell to get it to start. When it is cold, three pumps and it starts right up and ready to go. Where should I start? Engine is rebuilt with close to 9K miles, hydro lifters, and I rebuilt carbs recently, when I rebuilt trans with Doc Evil and motor was pulled. It is really a pain to restart after a drive. (IMG:style_emoticons/default/mad.gif)
Thanks |
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| rhodyguy |
Jul 23 2012, 07:26 AM
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#2
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Chimp Sanctuary NW. Check it out. Group: Members Posts: 22,080 Joined: 2-March 03 From: Orion's Bell. The BELL! Member No.: 378 Region Association: Galt's Gulch |
warm fuel in the carb bowls/lines in the engine compartment is my guess, esp given the weather you've been having.
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| IronHillRestorations |
Jul 23 2012, 07:27 AM
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#3
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I. I. R. C. Group: Members Posts: 6,719 Joined: 18-March 03 From: West TN Member No.: 439 Region Association: None 
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An old school independent Porsche mechanic told me to start it with the throttle wide open.
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| r_towle |
Jul 23 2012, 08:44 AM
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#4
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Custom Member Group: Members Posts: 24,574 Joined: 9-January 03 From: Taxachusetts Member No.: 124 Region Association: North East States
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Do you have phenolic spacers between the heads and intake manifolds.....and even the manifolds and carbs?
the motor actually gets hotter when you turn it off for a while as it becomes a heat sync. this can make carbs tough to start if they get to hot. Next time it does this, put your hand in there and feel the intak manifolds and feel the carb bodies... If they are to hot to touch, you may need to examine putting spacers in to seperate them from the head better. For the older 356's its 3 pumps, then wide open to the floor before even turning the key. It takes some time and a few turn overs, but they start if you dont pump. Rich |
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| SUNAB914 |
Jul 23 2012, 01:10 PM
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#5
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Senior Member Group: Members Posts: 698 Joined: 29-December 08 From: Fredericksburg VA Member No.: 9,880 Region Association: South East States |
r towle,
I have good spacers and nothing about that has changed since before I rebuilt them. I understand what you are saying, but this happens with in ony a few miles of running. If the car is cold, three pumps on pedal and it fires right up and ready to go. This is really wierd! |
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| r_towle |
Jul 23 2012, 01:24 PM
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#6
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Custom Member Group: Members Posts: 24,574 Joined: 9-January 03 From: Taxachusetts Member No.: 124 Region Association: North East States
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QUOTE(SUNAB914 @ Jul 23 2012, 03:10 PM)  r towle, I have good spacers and nothing about that has changed since before I rebuilt them. Who rebuilt them? Jet sizes change? Venturi sizes changed? Did they use the correct accel pump gasket/plunger? Odd, but many of the 40mm webers had different accel pump rubbers. Old ones are NLA or really hard to find. Each one has a different length plastic plunger. Check the accel pumps to see if they are spraying correctly, (key on, fuel pump on, press the linkage to full throttle) Really, prior to the motor running, the initial fuel is delivered by the accel pump. So, it needs to be right. the rebuild kits come with one size but it may not match your carb bodies. Ask my how I know...I have the old italian webers...a beotch to find the right accel pumps for these...I have a baggie with five different parts in it...none were right. finally found the right ones, but it took alot of hunting around. Rich |
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| SUNAB914 |
Jul 24 2012, 09:37 AM
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#7
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Senior Member Group: Members Posts: 698 Joined: 29-December 08 From: Fredericksburg VA Member No.: 9,880 Region Association: South East States |
I rebuilt them and yes they are old italian webers. I will check what you said about accel pump.
Thanks Rich. |
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| r_towle |
Jul 24 2012, 09:39 AM
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#8
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Custom Member Group: Members Posts: 24,574 Joined: 9-January 03 From: Taxachusetts Member No.: 124 Region Association: North East States
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Art Thraen
Rich |
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