SoCal Jet Boats

Tech Talk => Engine Mechanical / Electrical => Topic started by: dm2bfree on March 31, 2009, 11:00:39 AM

Title: Stock 460 fuel pump, how high of a CFM carb can it handle?
Post by: dm2bfree on March 31, 2009, 11:00:39 AM

I had a 750 vac secondary which my pump handled no prob, I'm putting an 850 dp (mech secondaries).. Do you think I'll have any issues using my stock fuel pump? Thanks!

Title: Re: Stock 460 fuel pump, how high of a CFM carb can it handle?
Post by: ryanbrindle on March 31, 2009, 12:06:08 PM

Should be ok.  I have the stock mechanical fuel pump on my BBF with the same carb you have and have never had a starvation problem. 

Title: Re: Stock 460 fuel pump, how high of a CFM carb can it handle?
Post by: Nick on March 31, 2009, 02:07:05 PM

I have a similar set up and here is what I know. I have an 800 dbbl pump mechanical secondaries that was just build by C&J engeering. They told me that carb needs a minimum of 6 lbs of fuel pressure. So I put a gauge on and found out that my old pump is not cabable of making anymore than 2 lbs......

Needless to say, I've ordered a new Holley pump, I guess my 32 year old pump has gone bad.....

Title: Re: Stock 460 fuel pump, how high of a CFM carb can it handle?
Post by: Ultra460 on April 01, 2009, 09:18:40 AM

Quote from: Nick on March 31, 2009, 02:07:05 PM

I have a similar set up and here is what I know. I have an 800 dbbl pump mechanical secondaries that was just build by C&J engeering. They told me that carb needs a minimum of 6 lbs of fuel pressure. So I put a gauge on and found out that my old pump is not cabable of making anymore than 2 lbs......

Needless to say, I've ordered a new Holley pump, I guess my 32 year old pump has gone bad.....

I had the same problem. I put a 850dp on my 460 and could only get 3psi out of the stock pump. I upgraded to a clay smith mechanical.

I would say put your carb on and get a regulator and gauge setup so you can see what it's doing.

Title: Re: Stock 460 fuel pump, how high of a CFM carb can it handle?
Post by: jet boat performance on April 02, 2009, 09:10:59 AM

Holleys like 6 to 7+ psi and plenty of volume , not saying it wont run that way , but you are likley leaving some performance behind Tom

Title: Re: Stock 460 fuel pump, how high of a CFM carb can it handle?
Post by: dm2bfree on April 02, 2009, 12:00:26 PM

So what do you think? Holley Red which is pre-set to 7psi, or Blue w/ a regulator set to 7psi to ensure it has enough volume?

Title: Re: Stock 460 fuel pump, how high of a CFM carb can it handle?
Post by: jet boat performance on April 02, 2009, 08:45:35 PM

Recently checked 3 holley reds at less than 6 psi , go Black or blue with a reg (just my 02)

Title: Re: Stock 460 fuel pump, how high of a CFM carb can it handle?
Post by: bertus on April 03, 2009, 08:59:01 PM

Im running a holley red with a 800 right now and it working fine.  Its at about 6.5psi.  Hopefully i dont jinx myself by saying that