Need Quick Answer: Fuel Pump for 250ci I-6

Hi all,

Well, today it looks like my fuel pump died. I have a '64 wagon that originally had a 194 I-6 but a previous owner had it replaced with a 250 I-6. From what I can tell, I think it has the stock 194 style pump as it looks like the picture listed on NAPA's site.

Looking up on NAPA's site, if I do a search for the "stock" 1964 configuration, I get the following pump listed, http://www.napaonline.com/Catalog/Ca...530_0265211631

If I put in a '70 Nova with a 250 I-6, I get a different pump, http://www.napaonline.com/Catalog/Ca...503_0199760991

The main differences they list are

For 194
Fuel Pump Gallons Per Hour : 30
Fuel Pump Pressure Rating : 3.2 lb - 4.7 lb
Fuel Pump Fitting Size : 1/8"-27 N.P.S.F.; 1/8"-27 N.P.S.F.

For 250
Fuel Pump Gallons Per Hour : 23
Fuel Pump Pressure Rating : 5 lb - 6.5 lb
Fuel Pump Fitting Size : 3/8" 90 Degree; 1/2"-20 UNF-2B

I do have a Clifford intake and exhaust with a Holley 390 4 barrel carb.

Any ideas which one I should get?

 

Go for the correct one for the motor. If the 70 is the year use it.

 

Get the same one that's in it now since the plumbing it there and you know it works. BTW my '64 230 looks like the the picture for the 194.

http://www.summitracing.com/parts/crt-m4503/applications/make/chevrolet?prefilter=1

for 194 and 250

 

Well, I went with the one I listed for the 250 above. NAPA had it in stock. As I was researching last night, I found the Holley carb wants between 4.5 and 6.5 psi. We tested the original one and it was at 3 psi at idle. An exact replacement would have been on the low side at max psi, I figured it would be better to use the one for the 250.

It seems to have helped with the idle. Still sorting out a few things but between that and getting the timing set correctly, it is running much better. No more pinging under a hard acceleration.