First concerning issue

keezling · #1 (**permalink**) 03-15-2015, 01:09 PM

By your description sounds like fuel boiling in float bowls. Mine did that sometimes on hot days. Fixed mine by accident when I added a turkey pan. Carb stays nice and cool on hot days now. Next time it happens put your ear near carb, if quiet enough outside you'll be able to hear it if that's what is happening.

Rawkkrawler · #2 (**permalink**) 03-15-2015, 02:17 PM

Both thoughts crossed my mind. I appreciate the ideas.

The fuel boiling issue was bad last year and it seamed as though the 1/2" spacer fixed it. Maybe a combination of some bad fuel and boiling.

I'll keep searching.

Gaz64 · #3 (**permalink**) 03-15-2015, 03:15 PM

I'd be checking the needle and seats for fuel line debris, then pull the float bowls to see if any rubber debris has made it's way into the metering blocks.

How much rubber line after the fuel filter?

How old is the rubber and when did you last "service" the rubber? ie: change fuel filter or replace a hose?

strictlypersonl · #4 (**permalink**) 03-15-2015, 04:38 PM

Quote:

I say concerning only because it's intermittent and the motor quit thus forcing me to pull over to troubleshoot. No real warning, slightly under load, just a sputter than tach to zero.

Are you saying that the tach goes to zero with the car in gear? If that's the case, you are having an intermittent ignition failure.

Rawkkrawler · #5 (**permalink**) 03-15-2015, 07:28 PM

Thanks to everyone for the responses!

The car was completed in June of last year. The entire fuel system is brand new. Fuel pump, fuel filter, steel line up to the firewall then back to a 3/8" fuel line to the new regulator then a small piece to the carb, which is also brand new.

The car has 1600 miles on it already. In Florida I try to take it out once a week. The 1/2" spacer helped last year but this just seemed to have just come out of nowhere. I did look at the sight glass on the front and rear of the carb and the floats seem high. I never adjusted them when I pulled it from the box but maybe I can drop them a little to see if that helps.

I'll also get in there after that and clean the needle and seat.

I mentioned the tach going to zero but I may have had the clutch in pumping the gas, I can't remember for sure. I haven't ruled out the ignition problem yet.

Dwight · #6 (**permalink**) 03-15-2015, 07:41 PM

check you fuel filter for size and does it have any trash (bits of rubber from the fuel line)in it?
Ethanol gasoline eats up most rubber.

Dwight

Snake2998 · #7 (**permalink**) 03-16-2015, 01:26 AM

Perhaps you have an intermittent electrical issue further up the line such as battery earth - did your other electrical gauges die at the same time as the rev counter.

The above wouldn't explain the symptom of lowered power at times.

Ron61 · #8 (**permalink**) 03-16-2015, 04:47 AM

I had much the same type of issue with one of my cars several years ago and it took months to finally find it. I thought it was a fuel problem and we check and cleaned the carb, fuel lines, and everything looked and tested OK. Then one day when we had it on my friends lift at his garage and it was at idle he noticed the rubber hose that connected to the fuel line suddenly sucked closed. We had checked that hose several times and it felt good. But it would start to close a little and power would drop and suddenly the engine would die. We pulled the hose off and checked it, even cut it open and it looked good. No soft spots or anything. But I put a new hose on and have never had a problem since. And as coincidence would have it a month or so after that a guy that I worked with was talking about his Dodge Charger doing the same thing. He had spend quite a bit having garages look at it and I told him what I had found. He changed that short rubber line and his problem went away too. And the one he took off looked good and had no soft spots in it either.

Ron

Gaz64 · #9 (**permalink**) 03-16-2015, 04:40 AM

Quote:

Originally Posted by Rawkkrawler

Thanks to everyone for the responses!

The car was completed in June of last year. The entire fuel system is brand new. Fuel pump, fuel filter, steel line up to the firewall then back to a 3/8" fuel line to the new regulator then a small piece to the carb, which is also brand new.

The car has 1600 miles on it already. In Florida I try to take it out once a week. The 1/2" spacer helped last year but this just seemed to have just come out of nowhere. I did look at the sight glass on the front and rear of the carb and the floats seem high. I never adjusted them when I pulled it from the box but maybe I can drop them a little to see if that helps.

I'll also get in there after that and clean the needle and seat.

I mentioned the tach going to zero but I may have had the clutch in pumping the gas, I can't remember for sure. I haven't ruled out the ignition problem yet.

This is your first problem, and needs to be addressed asap.

ALL carburettors need to have their float level checked and adjusted, especially removed from a box and fitted for the first time.
It has gone through transportation with the floats banged around upside down etc.

QFTs are great carbs, and I'm SURE the carb would come with instructions to tell you to set the levels correctly prior to engine start.