Looking for a new fuel pump...questions?

[takza]

The old one works OK...EXCEPT for noise right where it runs on the cam...pretty loud when first started in cold weather.

So I'm going to replace it before it strands me.

Have been looking over the pumps available and am thinking of going with a regular mechanical pump and this pressure regulator...having heard at least that lowering the pressure might save some fuel.

http://www.jcwhitney.com/autoparts/Prod ... =fuel+pump

Using an OEM type pump due to the need for the return line.

specs on the NAPA pump:

NAPA....mechanical $30.29 Gallons Per Hour:23 Pressure Rating: 3.5-4.5

Any ideas?

http://www.eagle-research.com/newslette ... 01_12.html

"My wife's Honda now has a fuel filter and fuel pressure regulator installed. This took a total of 0.5 hour (hood up to hood down) for the installation and cost about $40. I used a Purolator fuel pressure regulator and a common transparent plastic fuel filter. I installed them so that they are easily seen and adjusted when I open the hood.

The fuel filter is installed before the fuel pressure regulator to protect both the fuel pressure regulator and the carburetor. A lot of OEM fuel filters have a 'bypass' function that allows the fuel to bypass the filter, if the filter is dirty enough to be 'plugged'. With the transparent filter, I can see if the filter is getting dirty and change it.

With the fuel pressure regulator, I am able to set the fuel pressure to 0.5 psi (down from almost 10 psi that the electric fuel pump delivered) and enough fuel is provided for full power, even climbing mountains. I set the pressure down by 0.5 psi at a time, starting at 3 psi and running the vehicle in actual driving conditions for awhile between each adjustment.

EPA mileage rating for this car is 30 mpg city and 34 mpg highway. The car has never gotten so low mileage. With everything adjusted to OEM specifications and no fuel saving technology applied, it gets 32 mpg city and 36 mpg highway.

When I added the fuel pressure regulator I noticed an immediate mileage jump. It went to 34 mpg city and to 38 mpg highway.

The fuel pressure regulator really helped a 'float bowl flooding' problem that this particular carburetor had. The needle valve for the 'auxiliary' fuel system (for the 'pre-combustion' chamber) was chronically leaking and flooding. The lower O-ring would go bad and the fuel would bypass the needle valve completely. Since installing the fuel pressure regulator I have noticed only an occasional and minimal flooding problem.

Float bowl flooding is a typical cause of poor mileage when using carburetors. All carburetor inlet needle valves leak at some time, reducing the fuel pressure helps mitigate this problem. We absolutely need to reduce float bowl flooding or as we add fuel savers, we will get NO gain."

[Typrus]

I dunno about .5PSI.... Maybe 2? It'd depend on the particular car and the altitude I'd imagine.
My NAPA pumps have always worked great. And best of all? They are always in stock! lol.
You might regulate it down to 2 or 3. I personally can't see less than that being of much good to you. I might just be overly cautious though....

I think one of those solid-state pumps NAPA sells might be good, regulated down to 3PSI. Cut down vapor-lock by a rather large margin.

[keith]

I generally lower the float in the carburetor so there isn't as much fuel pressure on the jets. It also lowers any spill over from hard cornering.

We have an Autozone lifetime warrantee fuel pump on our Tercel. I put in an inline fuel pressure gauge, it reads about 2.5 lbs. of pressure.