RedHot66
Jul 13th, 04, 2:23 PM
Had an interesting (and devastating) failure that I have not tracked down completely and am looking for advice and direction from the experts here.
Carb (Holley) spewing gas out atmospheric vent from primary bowl on morning startup. I mean shooting it 12" above carb (after filter removed) on engine cranking (obviously the car didn't run with this issue). What I did:
- Replaced needle & seat.
- Float is plastic and not full of gas, assume to be OK.
- Set initial float level a lot lower than sight glass to be sure it shut gas off before overflowing. Would adjust after engine running.
- Drained oil and replaced filter. 2 extra qts showing on the dipstick! :eek:
- Fired up car, it ran fine, no overflow. As soon as I shut the car down, it spewed fuel again from the vent. :confused:
I have a mechanical fuel pump. Does a mechanical pump have some type of fuel pressure regulation built in? I am thinking I have too much fuel pressure and it is over powering the needle and seat. Am I on the right track? I know I need to simply measure the pressure, but I wanted to get some opinions and insight before digging in.
Oh, as I mentioned above. When the car was spewing fuel so badly on startup, it added about 2 qts to the oil pan! I replaced the oil and filter, but as soon as I put the carb back together and fired her up, she started knocking like a bit-- graemlins/angry.gif . 2500 miles on the second rebuild!!!! I am believing, after seeing the bearings on the first rebuild (500 miles), that this situation has been going on continually. The carb has been adding a small amount of fuel to the oil pan helping to keep the bearings nice and clean. :mad:
Thoughts? I have never experienced something like this.
Did I mention I was 400 miles from home returning from the Hot Rod Power Tour graemlins/sad.gif
Carb (Holley) spewing gas out atmospheric vent from primary bowl on morning startup. I mean shooting it 12" above carb (after filter removed) on engine cranking (obviously the car didn't run with this issue). What I did:
- Replaced needle & seat.
- Float is plastic and not full of gas, assume to be OK.
- Set initial float level a lot lower than sight glass to be sure it shut gas off before overflowing. Would adjust after engine running.
- Drained oil and replaced filter. 2 extra qts showing on the dipstick! :eek:
- Fired up car, it ran fine, no overflow. As soon as I shut the car down, it spewed fuel again from the vent. :confused:
I have a mechanical fuel pump. Does a mechanical pump have some type of fuel pressure regulation built in? I am thinking I have too much fuel pressure and it is over powering the needle and seat. Am I on the right track? I know I need to simply measure the pressure, but I wanted to get some opinions and insight before digging in.
Oh, as I mentioned above. When the car was spewing fuel so badly on startup, it added about 2 qts to the oil pan! I replaced the oil and filter, but as soon as I put the carb back together and fired her up, she started knocking like a bit-- graemlins/angry.gif . 2500 miles on the second rebuild!!!! I am believing, after seeing the bearings on the first rebuild (500 miles), that this situation has been going on continually. The carb has been adding a small amount of fuel to the oil pan helping to keep the bearings nice and clean. :mad:
Thoughts? I have never experienced something like this.
Did I mention I was 400 miles from home returning from the Hot Rod Power Tour graemlins/sad.gif