 IDA3C Weber Troubleshooting |
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| Cfletch |
 May 31 2025, 09:24 PM
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#1
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Member  Group: Members Posts: 168 Joined: 30-January 14 From: Santa Barbara Member No.: 16,941 Region Association: Southern California  |
Hey there everyone, working on getting my 6 conversion going here and I was able to hook up a temp fuel system in place of my tank while I am waiting on a few parts. I wanted to get the car to idle with its new fuel pump (not yet regulated down to 3.5psi) rated at 5 PSI max. I wanted to get the carb bodies full of fuel and get some pressure into the system and as soon as the pump turned on with the ignition the carbs essentially started dumping fuel down my intakes. Almost as if there was an internal leak causing fuel to just enter their respective cylinders. I'm new to down draft webers so this confuses me. I popped the top off of one of the carbs and noticed the fuel level was extremely low in the bowls so it was not like the needle and seat were stuck or a float was stuck causing it to overfill. Kind of stumped here as these carbs are rebuilt. Really any suggestions are good here. the float level was set, the needle and seats are good and not sticking at all.
I read somewhere but not in much detail that the bowls are vented? I have these little plunger-esq things in each vent tube that I have not yet pulled out. Would that be the source of my problem? If the bowls couldn't vent its just pressurizing the changes and causing the fuel to just leak down into the engine? |
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Replies
| Cfletch |
Jun 23 2025, 06:29 PM
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Member Group: Members Posts: 168 Joined: 30-January 14 From: Santa Barbara Member No.: 16,941 Region Association: Southern California |
My goal today was to do the tach stuff so I could see what my RPMs were at and do some more tuning, but that took a turn and instead I pulled the pedal board for rebuild and attached the new throttle cable. Also picked up my 911 front suspension from storage and will need to look into rebuilding all of that. No movement for engine today.
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| 930cabman |
Jun 24 2025, 04:45 AM
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#3
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Advanced Member Group: Members Posts: 4,205 Joined: 12-November 20 From: Buffalo Member No.: 24,877 Region Association: North East States 
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QUOTE(Cfletch @ Jun 23 2025, 06:29 PM)  My goal today was to do the tach stuff so I could see what my RPMs were at and do some more tuning, but that took a turn and instead I pulled the pedal board for rebuild and attached the new throttle cable. Also picked up my 911 front suspension from storage and will need to look into rebuilding all of that. No movement for engine today. funny how easy to get sidetracked with these 1/2 century beasts. Unless you go through every nut/bolt it's near endless. But we come back for more punishment over and over |
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Posts in this topic
Cfletch IDA3C Weber Troubleshooting May 31 2025, 09:24 PM
brant You should check and reset your float levels
Mos... Jun 1 2025, 06:14 AM mate914 carb float needle not setting, Get extra because n... Jun 1 2025, 06:58 AM 930cabman
Hey there everyone, working on getting my 6 conve... Jun 1 2025, 07:36 AM
porschetub
Hey there everyone, working on getting my 6 conv... Jun 1 2025, 02:28 PM Graydingo My vote would be stuck or faulty float needle. I n... Jun 1 2025, 08:16 AM Cfletch What would be an official test on the needle/seat?... Jun 1 2025, 10:48 AM Graydingo How are you verifying the bowl fullness?
What do... Jun 1 2025, 12:32 PM flyer86d I haven’t looked at mine but if your float needl... Jun 1 2025, 12:33 PM 930cabman Pierce has a float gauge kit if you need one. Easy... Jun 1 2025, 12:50 PM brant I run 4 psi on the race car
But bumpy and hard vi... Jun 1 2025, 03:15 PM Cfletch Ok team here is an end of day update.
My vents we... Jun 1 2025, 05:25 PM Graydingo Sounds like you are making progress.
Popping out... Jun 1 2025, 06:38 PM Cfletch
Sounds like you are making progress.
Popping ou... Jun 1 2025, 06:51 PM 930cabman Are your float levels correctly set per gauge? per... Jun 2 2025, 05:39 PM Cfletch I have on order a float level vial as well as the ... Jun 2 2025, 08:38 PM 930cabman
I have on order a float level vial as well as the... Jun 3 2025, 04:56 AM Cfletch A quick update with no real actual update on the c... Jun 5 2025, 11:38 PM 930cabman
A quick update with no real actual update on the ... Jun 6 2025, 04:55 AM sixnotfour In General everything about those carbs is not cor... Jun 6 2025, 06:53 AM Cfletch
In General everything about those carbs is not co... Jun 6 2025, 10:37 AM 930cabman
In General everything about those carbs is not c... Jun 6 2025, 12:37 PM Cfletch
[quote name='Cfletch' post='3209150' date='Jun 6 ... Jun 6 2025, 01:05 PM porschetub
[quote name='Cfletch' post='3209150' date='Jun 6... Jun 6 2025, 08:57 PM porschetub
[quote name='Cfletch' post='3209150' date='Jun 6... Jun 6 2025, 08:58 PM sixnotfour I apoligize wrong Weber carb problem post.. Jun 6 2025, 04:58 PM brant Are 135 mains the norm for a 2.7?
I don’t have ... Jun 6 2025, 05:02 PM Cfletch
Are 135 mains the norm for a 2.7?
I don’t have... Jun 6 2025, 06:27 PM sixnotfour :beer1: Jun 6 2025, 07:21 PM Cfletch
:beer1:
Looks like I'm right on the money t... Jun 6 2025, 07:32 PM Graydingo He "deadend" it so he could check PSI. I... Jun 7 2025, 07:44 AM Cfletch
He "deadend" it so he could check PSI. ... Jun 8 2025, 11:37 AM 930cabman I am running FP ---- FF ------- PR-------GA ------... Jun 7 2025, 04:27 PM Cfletch Hey friends, bit of an update for you all:
I... Jun 22 2025, 08:20 PM Cfletch Hey friends, bit of an update for you all:
I... Jun 22 2025, 08:20 PM 930cabman sounds like a victory, or getting close to it. The... Jun 23 2025, 04:58 AM gereed75 The airflow at idle is very dependent on idle spee... Jun 23 2025, 05:20 AM gereed75 The airflow at idle is very dependent on idle spee... Jun 23 2025, 05:20 AM 930cabman I generally get about 4 - 5 on my snail when adjus... Jun 23 2025, 09:01 AM Cfletch Kind of going back to this now that my suspensions... Aug 5 2025, 10:06 PM mb911 Does it smoke a lot? Wires in incorrect location? ... Aug 6 2025, 04:32 AM Cfletch It definitely smells rich and is smoking a decent ... Aug 6 2025, 01:56 PM mb911
It definitely smells rich and is smoking a decent... Aug 6 2025, 02:58 PM |
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