300 Inline 6 Cyl Fuel Pump Differences / Changes

Gentlemen...300/6 specialists (to be specific)...lol.

So I ordered a new Carter fuel pump for the 300 that is in my 1980 project. Since I've confirmed that the engine is a 1986, I have been using it as my baseline for ordering parts. When I looked on Rock Auto, it showed two different fuel pumps for 1986...one for Canada, and one for USA. However, the Canadian pump that I ordered is not the same as the pump that was installed on the engine:




Notice that the mounting flanges and pump arm positions are different. If you look at the mounting boss in the 300 block, it looks like it will accept either pump:



So after a little more research, it looks like the pump that was installed was the "USA spec" Carter M60330, and the Canadian spec pump I bought is a Carter M60387. I looks like I can bolt either one on...I guess?

The specs on the pumps are as follows:

M60330: 25gph at 2.0 psi
M60387: 18gph at 5.5 psi
M6807: 30gph at 2.0 psi (Rock Auto lists this carb for 1979 and back a couple years)

Rock Auto lists the carbs as follows:

1979- Lists the M6807
1980-1984 Lists the M60330
1985-1986 Lists the M60330 for USA, and the M60387 for Canada.

However, when you look up the carburetors, the same Autoline C6077 carb is listed as the YF replacement from the 1970's right up until 1986. (The truck came with an Autoline C6077 reman carb installed).

What I'm getting at is that even if the carb fits, the pump flow specs don't seem to jive. It is my understanding that we never did get the feedback carbs in Canada. I have personally never seen one on a truck anywhere. As far as I know, we got the regular old YF right up until the end of 1986.

So, if the carb (YF) stayed the same all along, why did the fuel pump specs change?

It would seem to me that the pump listed for Canada for 1985 and 1986 with the lower flow and higher pressure is a mistake, and should probably be the pump for the feedback carbs? Didn't they run a lot leaner than the regular old YF's?

Any thoughts good or bad?

Can I just go ahead and run the lower flow/higher pressure pump, or should I get the Carter M60330?

Part of the issue is the flow rates are at different pressures, higher pressure = lower flow. Test for flow is with no restriction, just emptying into a container for measurement. Since you never had the feedback crap in Canada (a lot smarter than we were here) I would treat it like my 1977 F150, 300 6 with only PCV and evaporative system, no AIR, no EGR and no catalyst. It probably would have taken the M6807.

When I pulled it out and put a 390 in it, I sold that engine to a friend's son who swore it was worn out (blowing oil out) I think I left the 1977 fuel pump on it and transferred all the emission stuff, manifolds included. His problem, PCV line into the intake was plugged.

85lebaront2 wrote

Part of the issue is the flow rates are at different pressures, higher pressure = lower flow. Test for flow is with no restriction, just emptying into a container for measurement. Since you never had the feedback crap in Canada (a lot smarter than we were here) I would treat it like my 1977 F150, 300 6 with only PCV and evaporative system, no AIR, no EGR and no catalyst. It probably would have taken the M6807.

When I pulled it out and put a 390 in it, I sold that engine to a friend's son who swore it was worn out (blowing oil out) I think I left the 1977 fuel pump on it and transferred all the emission stuff, manifolds included. His problem, PCV line into the intake was plugged.

You just remined of the EGR. The other difference...of all the 300/6 trucks I have looked at up here in Canada, the later ones (1985-1986) were all non-EGR. So not only did we not get the feedback carbs, we deleted the EGR at the same time. I'm not sure why though...

Maybe I'll just order one of the earlier fuel pumps and be done with it.

I should have clued in before I ordered these...the "Canadian spec" pump listing must be a mistake as the same reman carb (Autoline C6077) is listed as the replacement for the whole era with the standard YF carb.

Fyi, I checked both of my factory service manuals (1984 and 1985) and they both indicate a test pressure of 5-7 psi for the 300 mechanical fuel pump. They have sections for the YFA and YFA feedback, but make no mention of a different fuel pump for each of them.

Was it only the old YF carbs that only required 2.0 psi?

Cory - Here's what the MPC says.  Looks like things changed as of 12/84, with everything prior to that getting the 1976 version pump and from that point those over 8500 GCW and all in Canada got the later design.

I think you're fine with the Canadian spec pump.
It's a Canadian truck!

I'm kinda surprised at those specs as the 460 pumps call for a gallon a minute.

No, I'm not any kind of 300 specialist, but if you're drinking more than 18 gallons an hour you have bigger problems than a pump that can't keep up.

And the different pressures shouldn’t matter?

Bill is saying (^^^above) that the lesser volume is at a higher pressure (restriction)
Which explains 18 V 25 gph.

Almost any carb float should hold back 5.5 psig.

I am no expert but I think either pump would work if it bolts up.

Now is it me or the picture

That the out put nipple is larger on the old pump?
Dave ----

Dave, I think that's the input (rubber line from the frame)
Output would be the hardline going up to the carb..