Strange issue with Holley XP carb setup.
Discussion
I have had my Ultima now for 19 years now. Started out with a crate SMC V8 with a holley 750 four port, and now with a new 383 stroker with a Holley XP carb.
the problem I have always had is that during hard braking or very hard cornering I get momentary fuel starvation and engine cut out. I have raised the fuel level in the bowl but that doesn't help.
Strange that I have had the problem with two engines/carbs so it must be something else. Fuel pump seems ok, and fuel tanks are almost full but still it happens.
anyone ever had such an issue please?
Its the only thing that has always bugged me and tried Holley technical support - no solution, tried various race shops, but still no answer to what must be a very simple fix??
Any thoughts ?
the problem I have always had is that during hard braking or very hard cornering I get momentary fuel starvation and engine cut out. I have raised the fuel level in the bowl but that doesn't help.
Strange that I have had the problem with two engines/carbs so it must be something else. Fuel pump seems ok, and fuel tanks are almost full but still it happens.
anyone ever had such an issue please?
Its the only thing that has always bugged me and tried Holley technical support - no solution, tried various race shops, but still no answer to what must be a very simple fix??
Any thoughts ?
interesting! Never thought it might be over fueling ? worth a try. I did have the float level much lower (around one third up the sight glass on the mains, bit higher of the secondary's so might try lowering the secondary as well, and try the extensions.
I am amazed that holley don't put the extensions in as standard, if that is the problem. Will try them,
many thanks....
I am amazed that holley don't put the extensions in as standard, if that is the problem. Will try them,
many thanks....
I tried the wedge to lift the carb, but then the air cleaner fouls the rear hood. I have looked into the extensions for the fuel bowl and found the carb I have (XP) does not allow them.
One last thing to try is a fuel pressure regulator, which i haven't ever had. I have found my pump provides at least 8psi, the holley manual say anything over 7psi and "you will encounter running problems". Some Holleys run at max 5-6psi it seems. i will fit the holley pressure regulator (£40) which has a 7psi fixed flow for my carb and see what happens.
After that, i wont go around corners nor stop !
hope you are all enjoying your ultimas.
Anyone bought the new flashy Ultima watch ???
One last thing to try is a fuel pressure regulator, which i haven't ever had. I have found my pump provides at least 8psi, the holley manual say anything over 7psi and "you will encounter running problems". Some Holleys run at max 5-6psi it seems. i will fit the holley pressure regulator (£40) which has a 7psi fixed flow for my carb and see what happens.
After that, i wont go around corners nor stop !
hope you are all enjoying your ultimas.
Anyone bought the new flashy Ultima watch ???
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