Holley 750 puking fuel
Yeah I know… you read the headline and think Hey….just adjust the float level!
I have. It isn’t so simple.
I’m tinkering with this car…
It is a fairly mild 360 with a MP 280-474 cam, Weiand intake, cast iron manifolds and a Holley 600.
The 600 is fine. I have a Holley 750 I got from a friend that I wanted to test so I’m using the Dart as the mule.
First off, the car started and ran great with the 750….then it started to stumble and die. I thought I was out of gas. No, there was fuel dripping through the top of the secondary boosters. Yeah, the float level was too high. I replaced the needle and seat and started over. I had the float set to the middle of travel. Yeah, I’m aware that there are specific measures to follow for float height but I did it the bonehead way.
Still, the flooding persisted.
I have a gauge in the fuel line but it shakes like a triggered epileptic dude.
It sweeps around between 5 and 11 PSI. I had no overflowing/flooding issues with the 600.
I pulled the fuel bowl to get a look.
It is clean inside. No obvious problems. I tried another bowl with a new needle and seat in it.
Same problem. The float seems fine.
I have the float set all the way down…
When the needle and seat housing is flush with the bowl, you can’t get the float any lower. Now it runs great for longer before it eventually does the same thing and overflows. While running, I’ve pulled the sight screw out of the side to drain off excess gas and it just pours and pours out. The overflowing stops up top and the engine stays running but why is it still flowing when the float is at the lowest point? The needle isn’t stuck, it moves freely.
Is there supposed to be an O-ring in this recess?
Until it floods over, it idles great and has excellent throttle response.
Yeah I know… you read the headline and think Hey….just adjust the float level!
I have. It isn’t so simple.
I’m tinkering with this car…
It is a fairly mild 360 with a MP 280-474 cam, Weiand intake, cast iron manifolds and a Holley 600.
The 600 is fine. I have a Holley 750 I got from a friend that I wanted to test so I’m using the Dart as the mule.
First off, the car started and ran great with the 750….then it started to stumble and die. I thought I was out of gas. No, there was fuel dripping through the top of the secondary boosters. Yeah, the float level was too high. I replaced the needle and seat and started over. I had the float set to the middle of travel. Yeah, I’m aware that there are specific measures to follow for float height but I did it the bonehead way.
Still, the flooding persisted.
I have a gauge in the fuel line but it shakes like a triggered epileptic dude.
It sweeps around between 5 and 11 PSI. I had no overflowing/flooding issues with the 600.
I pulled the fuel bowl to get a look.
It is clean inside. No obvious problems. I tried another bowl with a new needle and seat in it.
Same problem. The float seems fine.
I have the float set all the way down…
When the needle and seat housing is flush with the bowl, you can’t get the float any lower. Now it runs great for longer before it eventually does the same thing and overflows. While running, I’ve pulled the sight screw out of the side to drain off excess gas and it just pours and pours out. The overflowing stops up top and the engine stays running but why is it still flowing when the float is at the lowest point? The needle isn’t stuck, it moves freely.
Is there supposed to be an O-ring in this recess?
Until it floods over, it idles great and has excellent throttle response.