New Fuel Pump Time


Apr 28, 2016
Given all the tuning i've done with my new 650 vacsec 4150 carb to get my ZZ4 running right, mid throttle ping persists, even with stock timing(10initial/32total/3000rpm), plugs(mr43lts) set to .045 gap, i decided to finally check on the fuel system.

I bought a Mr Gasket fuel guage adapter that splices into the fuel line, placed it in between the fuel filter and carburator, also bought the Mr Gasket fuel pressure guage(15psi), used teflon paste on the 1/8'' npt threads to seal the guage to the adapter, ran the engine and the needle bounces in both directions between 5psi and the max of 15psi, to confirm this madness, i connected an actron vacuum/fuel pressure guage, and that pegged at 10psi. max reading.

Even though the carburator float setting never changes, no fuel dribbling out of the straight leg boosters, this fuel pump definately needs replacement IMO, i dont plan on installing one of those holley adjustable fuel regulators that dead heads the fuel for i havent a return line to the gas tank, and besides, i've read it can cause the fuel to heat up and add methanol to the mix, noppers.

Pictures of fuel gauges and in action below.

Any advice on brand name and trusted 5-6 psi stock like mechanical pump?



  • fuel gauge 1.JPG
    fuel gauge 1.JPG
    213.8 KB · Views: 14
  • fuel gauge 2.JPG
    fuel gauge 2.JPG
    259.8 KB · Views: 14
  • fuel gauge 3.JPG
    fuel gauge 3.JPG
    158.3 KB · Views: 14
  • fuel gauge 4.JPG
    fuel gauge 4.JPG
    258.4 KB · Views: 14


Thread starter
Apr 28, 2016
I went with the $24.00 CARTER brand, designated for a 1979 malibu with a 350cid engine even though mine came originally with a 4.4L v8 from NAPA.... i'll put it in this weekend and see how it goes, pressure wise and as well as on the road.
  • Like
Reactions: 1 user

GBodyForum is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon, the Amazon logo, AmazonSupply, and the AmazonSupply logo are trademarks of, Inc. or its affiliates.

Please support GBodyForum Sponsors

Classic Truck Consoles Dixie Restoration Depot Mike's Montes P-S-T Southside Machine Performance UMI Performance

Contact for info on becoming a sponsor