Author Topic: carb problems (Read 3695 times)

motoracer · « **on:** Jan 28, 2011, 03:42:42 PM »

got my fuel lines run correctly. i think ive got my vacuum lines run right. so heres what its doing. its idling ruff,its suging when it hits 2000 rpm gos up and down from 2000 to 2100 rpm but clears up at higher rpm and also clears up below 2000rpm. and my fuel pump is dumping a lot of fuel tru the return line.. so please help anybody

emsvitil · « **Reply #1 on:** Jan 28, 2011, 03:57:22 PM »

Something may be stuck in the needle valve.

You might be able to flush it out by pinching off the fuel line to the carb; then just as the engine starts to die, releasing the pinch............

motoracer · « **Reply #2 on:** Jan 28, 2011, 04:08:23 PM »

ok ill try it . see what happens

motoracer · « **Reply #3 on:** Jan 28, 2011, 07:07:14 PM »

didnt fix the problem . should they be a lot of gas coming from the return side of the fuel pump?

motoracer · « **Reply #4 on:** Jan 31, 2011, 02:27:36 PM »

anybody help

83 Crawler · « **Reply #5 on:** Jan 31, 2011, 02:32:12 PM »

propane or efi

thats what im going to do

H8PVMNT · « **Reply #6 on:** Jan 31, 2011, 06:08:10 PM »

Rebuild it! Whe I took mine apart I found all kind of cool things the previous owner did that made the carb run just like that...

I wouldn't worry about the return line, it's doing what it's suposed to and you are getting fuel to the carb.

81_yota · « **Reply #7 on:** Jan 31, 2011, 06:42:28 PM »

i would try rebuilding it and make sure u clean any small ports out with thin wire and carb cleaner

motoracer · « **Reply #8 on:** Feb 01, 2011, 12:04:32 PM »

its a new rebuilt carb for national carbarator just had it on there a week

81_yota · « **Reply #9 on:** Feb 01, 2011, 03:36:11 PM »

i see posible bad regulator on mechanical fuel pump

warandall · « **Reply #10 on:** Feb 01, 2011, 04:24:44 PM »

could check the vaccum lines again make sure they're fully seated and no cracks/wholes in the lines. also everytime mine starts idling ruff i change the fuel filter. its cheap and easy

81_yota · « **Reply #11 on:** Feb 01, 2011, 04:37:54 PM »

might wanna drain tank clean it out and clean line to what year truck is it

motoracer · « **Reply #12 on:** Feb 01, 2011, 05:54:21 PM »

its a 86 with a sas and the tank is a 20 gal tank

81_yota · « **Reply #13 on:** Feb 01, 2011, 05:57:13 PM »

so did it run like that before you put new carb on ?

warandall · « **Reply #14 on:** Feb 01, 2011, 06:21:37 PM »

86 with a carb?

81_yota · « **Reply #15 on:** Feb 01, 2011, 06:33:52 PM »

they made 22r up to 89 i think

warandall · « **Reply #16 on:** Feb 01, 2011, 06:37:14 PM »

weird, based on everything i have ever seen/read i thought after 85 everything was EFI. But i have defiantly been wrong before

81_yota · « **Reply #17 on:** Feb 01, 2011, 06:49:37 PM »

efi more common after 85

motoracer · « **Reply #18 on:** Feb 02, 2011, 04:01:38 PM »

ran good with the first stock carb but like crab with a holley
350 first carb took a dump so i just got another stock carb

81_yota · « **Reply #19 on:** Feb 02, 2011, 04:09:57 PM »

did you make sure all vacs are hooked up correctly if so maybe possible the card u got is messed up

motoracer · « **Reply #20 on:** Feb 03, 2011, 07:30:26 AM »

i might since i have took all the smog off have it hooked up like a 84 canada model. if you look at it in the hanes book

81_yota · « **Reply #21 on:** Feb 03, 2011, 04:12:52 PM »

hmmmm did you block open ports and on dist make sure your advace is right and has both vacs hooked up

motoracer · « **Reply #22 on:** Feb 03, 2011, 04:38:01 PM »

motoracer · « **Reply #23 on:** Feb 03, 2011, 04:40:04 PM »

motoracer · « **Reply #24 on:** Feb 03, 2011, 04:44:11 PM »

ive put the thermastic vacuum switch were the egr vacuum switch was since i didnt need that switch anymore( the one with the 1 inlet and 2 outlet switch)

RABIDYOTA · « **Reply #25 on:** Feb 03, 2011, 04:48:22 PM »

wheres the fuel filter? my 86 surged only at idel but at 23 mile to a gal. i lived with it, lets think

? egr ? 2000 rpm ur out of idel circute, there is a power valve in the carb under the fuel bowl, leaking? any other drivability issues ?

motoracer · « **Reply #26 on:** Feb 03, 2011, 04:57:52 PM »

the fuel filter is next to the tank. it surges at 2000 rpm when you rev it and hold it at 2000 rpm .but at a pull when driving it dont do it. it idles ruff and i have to turn the choke all the way off. were its open all the time because if i dont it well idle high all the time it want idle down

RABIDYOTA · « **Reply #27 on:** Feb 03, 2011, 05:01:40 PM »

float level? vac. leak?

motoracer · « **Reply #28 on:** Feb 03, 2011, 05:10:04 PM »

float level looks good and i cant find a vacuum leak. im waiting on a new fuel pump to see if that might be the problem

RABIDYOTA · « **Reply #29 on:** Feb 03, 2011, 05:12:57 PM »

how are you adjusting the carb? almost sounds like under fueling running lean if it idels better with choke on

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