I just got my ‘62 back on the road after 5 years. I had been running it off of a 2 gallon tank with fresh gas in it for the engine break in. I drained the tank today and blew out the fuel line. After about 10 miles of driving it started bucking if I gave it too much pedal. So I just babied it home the last couple miles at about 40-45 mph. Fuel pump good, and checked timing though I don’t think that’s the issue. I think it just sucked some crap into the carburetor. Now the question, I have a 20 micron WIX fuel filter on there now. I would like to find an identical filter size and line fitting wise, but a 5 or 10 micron. Wix website only lists by application that I see. So how to find a more restrictive filter but same dimensions and line size. The only parts store in my area open today couldn’t find one. Here’s what I have now- https://www.fleetfilter.com/filter/...edihUZ9dbmj24qJhvEV7GAqYbzKPJcGxoCBnYQAvD_BwE
Not sure of the quality, as there's not many of this type of filter to choose from Moeller 033317-10 Carquest 86003
Sounds like fuel starvation. A finer filter would make it worse. Where in the line did you put your filter? First thing to check is for leaks in the suction side of the line. If you get any air into the line it won't pump properly. Second thing is location of the filter. On which side of the pump is it located? Fuel pumps are not very strong at sucking fuel and putting the filter before the pump can cause the problem you describe. Also, if the pickup tube in the tank has a screen or filter on the end, these can get blocked over time. This will restrict or completely block fuel flow. If the line connects directly to the tank, you may need to use a snake cam to see it inside. It could be a pinhole in the pickup tube, too. If the line connects at the sender the whole thing can be inspected by removing the sender. Often a new tank is in order. If it was an ignition problem, it would just quit. You're not getting enough gas to the carb. If all else fails, the float may be stuck partially open or shut. Not likely, though.
The filter is between the mechanical pump and carb. I didn’t pressure test the pump, just pump into a container. Good idea on sucking air, I didn’t check the rubber line between the tank and metal line going up front. The sock was replaced about 7 years ago. Fuel that I drained out was surprisingly clean and rust free, even at the very end when the rust usually pours out.
Probably not, but when I rebuilt the carb a few months ago, it was filled with crap that either came through the filter or the vent. I was running the same type filter previously as what’s on there now.
On every old rig I have = anything with a carburetor I add an extra inline filter between the tank and fuel pump and try to put it where I can reach it fairly easily. I have changed that filter a number of times on the side of the road on a couple of rigs before the tank got cleaned out to were the filter wasn't filling with crud every few hundred miles. For me that extra filter was insurance and at one time I carried as many as three spares. One other thing to consider, If you put a brand new fuel filler cap on it since you started getting it ready to go back on the road that car has to have a vented cap that actually vents. Depending on how much gas you have in the tank a cap that isn't venting will let you drive up to maybe four or so miles before the fuel pump creates a vacuum in the tank that it can't overcome and your rig starts stumbling and then quits and after sitting for a while will start back up and run again before repeating the process. I had that happen on my 51 Merc when I got it running along with so much crap in the tank including a broken bottle neck that I had to remove the tank and steam clean the inside of it.
It’s an older cap, but don’t think it’s vented. You know the funny thing is I had just drove to the gas station and filled the tank, so there’s less air in the tank now obviously. Yesterday , running off of the 2 gallon portable can, I was seating the rings, and it never missed a beat even doing about 10 10-50 mph full throttle runs. Also, when I blew the line out from the fuel pump end today , I heard the tank “pop”, like pushing a dent out. I wouldn’t doubt that that could be a contributing factor. So a vented cap would help I would think. Great idea, Thanks. I think I’ll loosen the cap and drive it again tomorrow and see if it changes. Doubt my local rural parts store has one in stock.
Maybe the strainer on the fuel pick up in the tank is clogged. The pop you heard when blowing into the tank from the line could have been the strainer blowing off the pick up tube.
33095 is 11 microns 33425 is 10 https://www.wixfilters.com/Lookup/filterlookup.aspx Click on look up by size
Sometimes a finer filter is not the answer.... The nature of any filter is that they flow more (and pass larger particles) when new, but as they load up they filter to a finer and finer participle size until they clog up or bypass. The solution might be to find a larger capacity element to increase overall replacement intervals. Ooops.... I just looked at the filter you are currently using, and you may not find a larger replacement in that configuration. You may have to make a plumbing change to accommodate a larger unit.
A human blood corpuscle is 8 microns! Also its not an absolute value. You need to consider filter efficiency. A 10 micron WILL pass larger particles if its not 100% efficient, and no filter is 100% efficient. A lot of debris in carbs is corrosion due to moisture seperation and also crystalisation of fuel aditives when the fuel repeatidly evaporates during storage cycles
Thanks everyone. If that’s all it takes I’ll be a happy guy. Thought I was going to have to pull the carb again for a teardown. Trying to get it ready for a 450 plus mile run in a few weeks.
I doubt that the crap you had in your carb came through that fuel filter. Probably from evaporation of the great gas we now have.
You might want to evaluate the filter performance, both for letting stuff through, and being plugged. So pull the top off the carb again, and take out the filter and cut it open. Then you'll know if it's letting stuff through, or if it's getting plugged up (and if you need to clean out the tank more?) I like to put another filter between tank and pump on old cars that have lots of crap in the tank, and then change it a time or two until it stops getting plugged up. Good to see it's on the road again! as for the tank venting...you might want to investigate further. Many old cars used a vented cap, but a few had a separate vent system and non-vented cap.
Well I just got back from a 48 mile run. Drilled a hole in the old cap before I left, then didn’t tighten it all the way. Ran flawlessly. Sooo…I want a cap that I can just tighten normally, but will vent. Any recommendations? And thanks again guys, a load off my mind not having to pull that carb again!
is the stock cap vented? https://www.rockauto.com/en/moreinfo.php?pk=205750&cc=1335529&pt=5900&jsn=923 looks like it to me
This is what was on there. No idea how old it is or if it’s original. Looks very similar to the link posted
You can get the proper cap from any on line vendor of parts for your car. It sounds like you've found your problem. With an unvented cap the car will create a vacuum in the tank as the gas gets used until the pump can't overcome it. The only time a car used an unvented cap is when it has a vapor recovery system or a separate vent tube, usually on the filler neck up by the cap. In '67 almost all were vented caps. Ask when buying. I understand being rural. We have to go to as many as 3 different states to get anything here. ANYTHING!!
A filter from a late model hpcr diesel would be in the neighborhood of two to four microns, although it seems the filter isn’t the issue here.
I can see if they can order one. I’d just have to wait. If not I’ll order online, just don’t want a junk one that the vent doesn’t work correctly. Rural has it advantages though- I hit 3 stop signs and no lights on my 48 mile drive.
Ahh, now I see, no mine is nothing like that one. The first link I could only see one view and it looked similar to the one I posted pics off. Sorry. It must have got changed somewhere along the way. I honestly have never put a cap on it since I got the car back in ‘85 or so. Kinda embarrassing, I can rebuild the engine, but don’t know crap about gas caps.
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