So I've been getting a lot of fuel delivery trouble, along with trash in my fuel filter so I figured my gas tank was rusty (Which it was). I dropped it and had a radiator shop dip it and coat it w/ Red Kote. Installed it this past weekend and I was pumped, thought that would fix my surging and stalling problem. Not so much. I haven't changed the fuel pickup but the pipe seems clean, water runs through it smoothly w/o any problems. So I thought maybe my mechanical fuel pump was stopped up from all the trash earlier. I swapped it out and that didn't help either. I thought lastly it may be the entire fuel line but dread replacing it. I can hold it at 1100-1200 RPM and it run ok, stumbles a little but stays running. I adjusted the idle up to 1200 RPM and ran most a can of SeaFoam through it letting it sit in the driveway. Didn't help either. The only thing I haven't done is address my carb yet, its an edelbrock 600. I've always had a filter right before the carb so no trash should have made it through but I'm runnng out of ideas. The fuel coming through the fuel filter is crystal clear so I don't think its the lines. It runs just a rough down the road as it does during idle so I don't think its the idle circuit. Now one thing to note, the idle was set around 800-900 and would idle there smoothly for about 5 seconds, start stumbling for a couple seconds and then smooth back out... Here's the last part of the problem. My battery isn't charging at all, if I'm idling the battery voltage climbs up to around 13-13.5 but as soon as I hit the throttle it drops back down to 12.5-13. The alt is obviously charging but I don't think enough. Would this make it stumble as I mentioned? Thx for any help.
What kind of ignition are you running? IF you are running high voltage stuff like MSD low voltage might mess with it sure enough. I had all SMD on my F100 once and had an alternator go out on me. Once the battery started getting low it would act up like yours is. It might also be back connections and grounds. clint
I was running a Mallory box but bypassed it so now I'm just using a Mallory Unilite distributor and a MSD Blaster 2 coil. The alternator is a stock replacement. I'm pretty sure I have good grounds all around. I really don't have anything that would be a drain on the electrical. What size battery are you guys running?
ive had a rusty tank problem with a edelbrock carb. the rust can get past fuel filters. it would clog up the edelbrock carb really fast. take the carb off clean it out really well, blow out the passages with carb cleaner and comopressed air.
take the carb off the intake. pull the top off the carb. you should see the bottom of the bowls full of rust. you should be able to blow and clean every thing at this point with out any more disassembly. be carefull when takeing the top off the carb that you dont tear the gasket and you will be able to reuse it, other wise you will need to get a rebuild kit to get a new gasket.
Its likely not repairable and you should give me your car. Seriously like mentioned above the carb is probably filthy inside.
Yep, rust makes it through filters pretty easily. It has a tendency to break pretty far down till it hits a small passage way like a jet and then sit there and collect with more nasty little bits of rust till you have a blockage and start running pretty lean. I work on a lot of ATV's and dirt bikes, and see this quite a bit. Old dirt bikes with steel tanks are pretty notorious for this happening.
Another thing to not, water has a tendency to collect along with the rust for some reason. I wouldn't be surprised if you find water droplets along with the rust.
Well I took apart the carb and yes there was some rust in the bowls and some all over the inside but where I REALLY found the rust was at the very top around the small mesh filters in the tube the fuel feeds from to the primary and secondary circuits. I think I got it all cleaned out, I just have to pick up a new gasket tomorrow and see if that fixed it. Hopefully that takes care of it.
That will more than likely take care of your problem. Did you use carb cleaner to blow things out, then follow it up with compressed air to finish the job and dry things?
I didn't use compressed air, but I ended up taking it apart further so that I could clean the individual parts better. I'll post after I get it put back together and back on the car.
