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Username Post: Carb fuel pressure        (Topic#360212)
sting199 
Newbie
Posts: 36

Reg: 12-12-19
03-19-20 11:04 AM - Post#2788977    

Got a 350 in my Corvette with a Holley 670 avenger carb. I am having a terrible time keeping the secondaries from flooding out. Bought a new fuel pump, and put a gauge on it, and getting 10-12# output pressure. The carb is rated input pressure to be 4-6#, so I guess the extra pressure is blowing past the needle valve. (new needle valve and o-ring) Can't find a pressure regulator to work on a carb with this much pressure. Now, I am trying to find another pump that lists the output pressure, without much luck. All suggestions will be well appreciated!



 


grumpyvette 
Senior Chevytalk Moderator -- Performance Subject Matter Expert --
Posts: 17461
grumpyvette
Age: 72
Loc: FLORIDA USA
Reg: 03-16-01
03-19-20 12:15 PM - Post#2788980    
    In response to sting199

read the linked info and sub-links







http://garage.grumpysperformance.com/index.php?thr...

http://garage.grumpysperformance.com/index.php?thr...

http://garage.grumpysperformance.com/index.php?thr...

http://garage.grumpysperformance.com/index.php?thr...

http://garage.grumpysperformance.com/index.php?thr...

http://garage.grumpysperformance.com/index.php?thr...

http://garage.grumpysperformance.com/index.php?thr...

IF YOU CAN,T SMOKE THE TIRES AT WILL,FROM A 60 MPH ROLLING START YOUR ENGINE NEEDS MORE WORK!!"!
IF YOU CAN , YOU NEED BETTER TIRES AND YOUR SUSPENSION NEEDS MORE WORK!!


Edited by grumpyvette on 03-19-20 12:40 PM. Reason for edit: No reason given.

 
65_Impala 
Very Senior Member
Posts: 4436

Reg: 12-29-02
03-19-20 12:21 PM - Post#2788981    
    In response to sting199

A regulator like this would work,
https://www.summitracing.com/parts/sum-g3032?rrec= ...


A factory replacement type pump should have the correct pressure. Something like this,
https://www.summitracing.com/int/parts/crt-m60038/ ...

If you want more flow then you may need a higher performance pump and a regulator.







 
Shepherd 
Frequent Contributor
Posts: 2003

Loc: Lake George, NY
Reg: 11-11-15
03-19-20 12:52 PM - Post#2788984    
    In response to sting199

What pump is this? Unusual for a stock mechanical pump to put out that much pressure.



 
sting199 
Newbie
Posts: 36

Reg: 12-12-19
03-20-20 06:26 AM - Post#2789034    
    In response to Shepherd

It was a carter, M6955, that is only rated to put out 5.5-6.5 psi. Unless my gauge is not any good.



 
sting199 
Newbie
Posts: 36

Reg: 12-12-19
03-20-20 06:29 AM - Post#2789035    
    In response to grumpyvette

Looks good, but can't find a regulator that works on a carb system. The only one I have found so far, has a max. input of 6 psi.



 
pauldian 
Contributor
Posts: 303
pauldian
Loc: seligman,arizona
Reg: 05-14-09
03-20-20 07:26 AM - Post#2789041    
    In response to sting199

Go to RockAuto Home Page
More Information for DELPHI MF0001 Add to Cart

Continue Shopping
<
1 / 6

Point to Zoom

>
Part image


Mechanical

Delphi sets itself apart from the fuel pump competition with three words: fast pressure rise. As the OE, Delphi knows how to restore fast-pressure performance and system integrity translating to better pumping through less energy. Their pumps are designed to operate under extreme temperatures, quick engine starts and to avoid low-fuel hesitation, including alcohol fuels and blends.
Features

Increased durability and enhanced stability due to internal springs preventing fuel tube chafing
Better security and durability with multiple redundant buttons on the fuel level sensor
Improved durability with steel plated, all metal internal components
Large volume reservoir maintains sufficient fuel in low fuel situations and vehicle cornering
Longer pump life as a result of a two-strainer system keeping out contaminates
Lower failure rates due to its innovative design and durability.
Reduced potential for greenhouse gas emissions via the EVAP system because of integrated OE fuel vapor pressure sensor.
Guaranteed correct gas gauge reading

Fuel Pump Replacement: Do it right the first time!

Prior to Replacing Pump, check:

Fuel Pump Fuse(s)
Fuel Pump Relay
Voltage at the Pump - test for bad wiring
Voltage drop test - corroded connector, bad wiring
Fuel System Pressure - test for pump pressure being outside accepted range

When Replacing Pump, also:

Replace the Fuel Filter
Replace the Fuel Strainer
Clean / Flush Tank
Refill with fresh, uncontaminated fuel

Package Contents Mechanical Fuel Pump, Gasket, Instruction Sheet
System Pressure 5 PSI
Inlet Outside Diameter (in) 0.375
Fuel Type Gas
Gasket or Seal Included Yes
Inlet Type Hose Bead
Outlet Type Threaded
Outlet Quantity 1
Inlet Fitting Thread Size 5/8 in. - 18 UNF
Average Flow Rating (GP) 40
Alternate/OEM Part Number(s): 6440726, 6440987, 6442080, 6470779



 
Shepherd 
Frequent Contributor
Posts: 2003

Loc: Lake George, NY
Reg: 11-11-15
03-20-20 08:01 AM - Post#2789045    
    In response to sting199

I'd check it with another Gage, never used a regulator on any mechanical pump, not even the high out GM pumps. Did you check the float level in the secondaries?



 
65_Impala 
Very Senior Member
Posts: 4436

Reg: 12-29-02
03-20-20 09:35 AM - Post#2789050    
    In response to sting199

  • sting199 Said:
Looks good, but can't find a regulator that works on a carb system. The only one I have found so far, has a max. input of 6 psi.




You must be reading the specifications wrong or the place you shopped had the information listed wrong. There are lots of regulators available that can accept 11psi and drop it to 6psi.

That pump should work fine without a regulator. I second testing with another gauge.



 
sting199 
Newbie
Posts: 36

Reg: 12-12-19
03-20-20 03:19 PM - Post#2789066    
    In response to Shepherd

Oh yes,, many times. They flood out even when I have the float level as low as I can.



 
sting199 
Newbie
Posts: 36

Reg: 12-12-19
03-21-20 07:42 PM - Post#2789185    
    In response to pauldian

That Delphi fuel pump retails for only $10.16, through Rock Auto. Seems to low to be true!



 


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