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Posted this is in tow section but no response. Hope you guys don't mind helping me out on my tow vehicle's carbatater.

Vehicle is a 4-WD 73 'Burb with a smallblock, T-350. All it does is go up and down a really steep launch ramp and an even steeper driveway. Always w/out issue until this past weekend.

Carb is an Edelbrock 600-ish (Looks like a Carter). When pulling my driveway, the truck "bobbled".. Not a backfire, more of a really long miss (like 1 second)... Driveway is really really steep, so this had my full attention. It then picked up and went back up the drive. I thought there might be a fuel pickup issue, so I added 15 gallons of gas. The next day, it did the same thing at about the same spot. Still suspect fuel.

Not happy w/ throught of a dead vehicle on that driveway with a boat behind and a Burb full of people. I would really HATE to try to hold it on the driveway w/out power breaks...

Wondering if there's a fuel filter in the carb at the inlet?? Edelbrock's website didn't mention one but trying to confirm. No filter between pump and carb currently.

What else should I be looking at??

Thanks!

Neil
 

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Not usually a filter in the inlet of the Edelbrock carbs. Usually use an inline one between pump and carb.

Since it looks like you don't have a filter between the pump and carb there is a good chance you have a piece of something that may be stuck in the needle and seat. This can cause the issue you are describing.

Take a look at it. Oh, get a filter there too.

Let us know with further findings or non-findings.
 

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I'm not sure it's your cure, but there are small wire mesh filters in those carbs. They are behind the needle and seat assembly. Just pull the top, remove the floats, pull the needles, and with a large flathead screwdriver unscrew the seat and you'll see what I'm talking about. If you're careful you'll be able to do this and not need any new gaskets. It's very simple.

Check all the simple stuff like. elec. grounds. Could just be a shifting batt. and a poor ground kinda thing.

Good luck!
 

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Discussion Starter #4
thanks for the replies. Confirms my suspicions and gives me somethin' to do this weekend. :p
 

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Different year trucks but something to look out for after checking fuel issue:

I've to diagnose several 87-95 Tbi trucks that would have major hesitation only when starting from a stop and usually hard acceleration or pulling trailer or loaded up. Sometimes they'd die, sometimes not. Restart and/or continue to drive off easier and they'd act fine.

Busted/worn motor mount.....+cable to starter rubbing and worn against frame. Yup ! 1st one kicked my butt for days.
 

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Discussion Starter #6
Ugh. Don't know if I'd ever have figured that one out (Budweiser would have though!!!). Cables are two years old or so. I'll still check them over real good though. Thanks!


Different year trucks but something to look out for after checking fuel issue:

I've to diagnose several 87-95 Tbi trucks that would have major hesitation only when starting from a stop and usually hard acceleration or pulling trailer or loaded up. Sometimes they'd die, sometimes not. Restart and/or continue to drive off easier and they'd act fine.

Busted/worn motor mount.....+cable to starter rubbing and worn against frame. Yup ! 1st one kicked my butt for days.
 
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