Fuel pump swap 4.0

[richard booth]

So I finished my 4.0 swap into my 88 Bronco 2, man it runs like a beast. I did the 410 Comp Cam 4:56 gears with 33s Etc, but the fuel gauge doesn't work with the B2 fuel pump assembly in the tank so question is can I put in a 1990 Bronco II fuel pump and have that be enough pressure for the 4.0? And if I leave the high pressure pump that's in the frame rail will the two work together okay? Sorry that's two questions.

 

[RonD]

The 1988 sender should work with 1988 gauge?
73 ohms empty, 10 ohms full

In 1989 Ford changed gauges and senders
16 ohms empty, 160 ohms full
These senders wouldn't work with 1988 fuel gauges

If you put in a 1989 and up fuel pump assembly, you would delete the frame rail pump, remove it and connect the 2 fuel lines together, or add a second fuel filter in the gap

In some 1988s there was also a canister type filter used as a reservoir in the dual pump setup
You could also eliminate that when switching to a 1 pump EFI(fuel injection) setup

 

[richard booth]

The 1988 sender should work with 1988 gauge?
73 ohms empty, 10 ohms full

In 1989 Ford changed gauges and senders
16 ohms empty, 160 ohms full
These senders wouldn't work with 1988 fuel gauges

If you put in a 1989 and up fuel pump assembly, you would delete the frame rail pump, remove it and connect the 2 fuel lines together, or add a second fuel filter in the gap

In some 1988s there was also a canister type filter used as a reservoir in the dual pump setup
You could also eliminate that when switching to a 1 pump EFI(fuel injection) setup

Sorry, I did the explorer dash swap.

 

[richard booth]

I should have included that I did an explorer dash swap.

 

[richard booth]

Sorry, I did the explorer dash swap.

Good option replacing the B2 pump w another filter, thanks!

 

[RonD]

Yes, then replace fuel pump assembly with 1989 or later 1 pump setup

 

[richard booth]

Lastly, the 90 B2 pump is plenty for the 4.0? And does the gauge get harmed by the wrong ohms? Thanks a lot for your time and experienced help!

 

[alwaysFlOoReD]

The fuel pump will be fine. I'm not sure about the ohms but suspect it doesnt hurt.

 

[RonD]

+1 ^^^ B2 pump is fine for 4.0l

No, wrong resistance(ohms) won't hurt either the gauge or sender, just won't show correct levels

A gasoline engine's horse power rating is directly tied to how much fuel it can burn at the 14.7:1 air:fuel mix ratio, which is a WEIGHT ratio
14.7: pounds if air to 1 pound of gasoline

So Fuel Pumps(and injectors) are rated in Gallons(or pounds) of fuel they can deliver in one hour(GPH) but at 0 psi(free flow), no back pressure, or in Liters per hour(LPH)
30GPH pump can do up to a 300 horse power engine
Ford pumps for Rangers and B2s were about 40GPH at 0psi so at 30-40psi that would be 35GPH, so OK up to 350HP
This is why stock pump is fine to use on V8 swaps if HP is under 300HP

Summit has an easy to read info page on this: https://help.summitracing.com/app/answers/detail/a_id/5245/~/what-size-fuel-pump-do-i-need?

 

[richard booth]

+1 ^^^ B2 pump is fine for 4.0l

No, wrong resistance(ohms) won't hurt either the gauge or sender, just won't show correct levels

A gasoline engine's horse power rating is directly tied to how much fuel it can burn at the 14.7:1 air:fuel mix ratio, which is a WEIGHT ratio
14.7: pounds if air to 1 pound of gasoline

So Fuel Pumps(and injectors) are rated in Gallons(or pounds) of fuel they can deliver in one hour(GPH) but at 0 psi(free flow), no back pressure, or in Liters per hour(LPH)
30GPH pump can do up to a 300 horse power engine
Ford pumps for Rangers and B2s were about 40GPH at 0psi so at 30-40psi that would be 35GPH, so OK up to 350HP
This is why stock pump is fine to use on V8 swaps if HP is under 300HP

Summit has an easy to read info page on this: https://help.summitracing.com/app/answers/detail/a_id/5245/~/what-size-fuel-pump-do-i-need?

Thanks a lot for such an informative reply Ron! Appreciate your time.