Fuel pump specs updated

J

JP Verweij

Fuel pump specs (carbureted) , updated. Keep them specs comming!. Its all just aviable information bundled on one page.
Not going to discus whats my favourite, its just info to share and make your own plan.

Webers work best at approx 4 psi of fuel pressure (Not 2 psi like many of the older books stated.)
Holleys run 6-7 psi fuel pressure.
and you need Volume not Pressure to keep the float bowl full of any carburetor.

Fuel pump specifications:

Facet silver Top, 36 GPH free flow, 23 GPH @ 2 psi. 11.5 GPH @ 4 psi.
Facet Red Top 40 GPH free flow, 35 GPH @ 2 psi. 20 GPH @ 4 psi
Facet Blue Top, 45 GPH, 38 GPH @ 2 psi. 23 GPH @ 4 psi

Facet Dura Lift 40285, 33 GPH Free Flow, 4-7 psi @ no flow.
Facet Dura Lift 40222, 33 GPH Free Flow, 9-11 psi @ no flow, 17 GPH @ 4 psi
Facet Dura Lift 40290, 50 GPH Free Flow, 12-15 psi @ no flow, 20 GPH @ 8 psi
Holley Red flows 97 Us GPH free flow - 67 Us GPH @ 5psi, 71 GPH @ 4 psi
Mallory Comp 110, 110 free flow, about 90 Us GPH @ 6psi. about 95+ Us GPH at 4psi, factory preset at 7psi @ 20 Us GPH.
Mallory Comp 140, 140 free flow, 120+ Us GPH @ 6psi. about 135 Us GPH @ 4psi, factory preset at 12 psi @ 110 Us GPH
Carter P4600HP flows 100 Us Gph free flow.

Steward Warner 240A, ?

The more pressure a pump has to deliver the less GPH is pumped by the pump. That’s why we are not interested in free flow numbers given by the manufacturers.

Modern fuel pump calculators calculate:

250 bhp you´ll need 24 GPH @ 4 - 7 psi, that’s about max a Facet Dura Lift (40290) can handle.
350 bhp you’ll need 33 GPH @ 4 - 7 psi, so that leaves a Facet Red & Blue Top out.
400 bhp you’ll need 37 GPH @ 4 – 7 psi.
4 psi for the weber carb, 7 psi for a Holley carb.

Facet Red & Blue top pumps have no flow at 7 psi while Holley recommends 7 psi at idle, and a minimum 4 psi at engine redline for their carbs. So that rules a Facet pump out when running a Holley carburetor on any engine.

You also don’t want to be on the edge of a pumps capacity cause as the pump wears it affects its GPH.
Especially the Facet Red & Blue wears out fast. Unless you don’t drive that often.

If you run multiple carbs, you’ll have to take into account multiple float chambers have to be filled at the same time and rate. And as multiple carbs have multiple pump jets you’ll need some extra capacity (Volume in GPH) to keep up the demand.

Facet Red or Blue pumps can be used if running them simultaneously.
Red & blue are the same pumps with the difference that the Red has a filter inside and the Blue not (no restriction hence the slightly more GPH).
 
J

JP Verweij

Revised 17th May 2026.
Little updates,

Would like more input & information to complete this list.

Webers work best at approx 4 psi of fuel pressure (Not 2 psi like many of the older books stated.)
Holleys run 6-7 psi fuel pressure.
You need Volume not Pressure to keep the float bowl full of any carburetor.

Fuel level in the bowl also has major influence on the fuel mixture, as the level also affects the level in the emulsion tubes where fuel & air are mixing together.

Fuel pump specifications:

Facet silver Top, 36 GPH free flow, 23 GPH @ 2 psi. 11.5 GPH @ 4 psi.
Facet Red Top 40 GPH free flow, 35 GPH @ 2 psi. 20 GPH @ 4 psi
Facet Blue Top, 45 GPH, 38 GPH @ 2 psi. 23 GPH @ 4 psi

Facet Dura Lift 40285, 33 GPH Free Flow, 4-7 psi @ no flow.
Facet Dura Lift 40222, 33 GPH Free Flow, 17 GPH @ 4 psi 9-11 psi @ no flow,
Facet Dura Lift 40290, 50 GPH Free Flow, 20 GPH @ 8 psi 12-15 psi @ no flow,

Holley Red flows 97 Us GPH free flow - 71 GPH @ 4 psi, 67 Us GPH @ 5psi
Mallory Comp 110, 110 GPH free flow, about 95+ Us GPH at 4psi, about 90 Us GPH @ 6psi. Factory preset at 7psi @ 20 Us GPH.
Mallory Comp 140, 140 free flow, about 135 Us GPH @ 4psi, 120+ Us GPH @ 6psi. factory preset at 12 psi @ 110 Us GPH

Carter P4600HP flows 100 Us Gph free flow. No further info found

Edelbrock pumps flows 110 & 120GPH free flow according to their specs, no further info.

Steward Warner 240A, ?

Bosch 044 - 80GPH @ 72,5 psi.

The more pressure a pump has to deliver the less GPH is pumped by the pump. That’s why we are not interested in free flow numbers given by the manufacturers.

Modern fuel pump calculators calculate:

250 bhp you´ll need 24 GPH @ 4 - 7 psi, that’s about max a Facet Dura Lift (40290) can handle.
350 bhp you’ll need 33 GPH @ 4 - 7 psi, so that leaves a Facet Red & Blue Top out.
400 bhp you’ll need 37 GPH @ 4 – 7 psi.
500 bhp you’ll need 50 GPH
600 bhp you’ll need 60 GPH

4 psi for the weber carbs, 7 psi for a Holley carb.

Facet Red & Blue top pumps flow just 20 GHP @ 4psi while Holley recommends 7 psi at idle, and a minimum 4 psi at engine redline for their carbs. So that rules a Facet pump out when running a Holley carburetor on any engine above 200 bhp or running more than one carb on any engine above 150bhp.

You also don’t want to be on the edge of a pumps capacity cause as the pump wears it affects its GPH.
Especially the Facet Red & Blue wears out fast. Unless you don’t drive that often.
Plunger pumps are not forgiving on this matter as the bore & seal wear out fast.
Vane pumps, as they wear are more forgiving.

If you run multiple carbs, you’ll have to take into account multiple float chambers have to be filled at the same time and rate. And as multiple carbs have multiple pump jets you’ll need some extra capacity (Volume in GPH) to keep up the demand.

Facet Red or Blue pumps can be used if running them simultaneously.
Red & blue are the same pumps with the difference that the Red has a filter inside and the Blue not (no restriction hence the slightly more GPH).

To ad a common fuel filter,
Malpassi 85mm filterking, flowrate 45 GPH, 10 micron filtration.
If you’r are running a 6-7 PSI factory pre set pump, there’s no need to adjust pressure on a filterking, so Ill assume flowrate still will be around the 40-45 GPH if the pump is capable enough.
 
manta22

Neil

Supporter
JP Verweij said:
Revised 17th May 2026.
Little updates,

Would like more input & information to complete this list.

Webers work best at approx 4 psi of fuel pressure (Not 2 psi like many of the older books stated.)
Holleys run 6-7 psi fuel pressure.
You need Volume not Pressure to keep the float bowl full of any carburetor.

Fuel level in the bowl also has major influence on the fuel mixture, as the level also affects the level in the emulsion tubes where fuel & air are mixing together.

Fuel pump specifications:

Facet silver Top, 36 GPH free flow, 23 GPH @ 2 psi. 11.5 GPH @ 4 psi.
Facet Red Top 40 GPH free flow, 35 GPH @ 2 psi. 20 GPH @ 4 psi
Facet Blue Top, 45 GPH, 38 GPH @ 2 psi. 23 GPH @ 4 psi

Facet Dura Lift 40285, 33 GPH Free Flow, 4-7 psi @ no flow.
Facet Dura Lift 40222, 33 GPH Free Flow, 17 GPH @ 4 psi 9-11 psi @ no flow,
Facet Dura Lift 40290, 50 GPH Free Flow, 20 GPH @ 8 psi 12-15 psi @ no flow,

Holley Red flows 97 Us GPH free flow - 71 GPH @ 4 psi, 67 Us GPH @ 5psi
Mallory Comp 110, 110 GPH free flow, about 95+ Us GPH at 4psi, about 90 Us GPH @ 6psi. Factory preset at 7psi @ 20 Us GPH.
Mallory Comp 140, 140 free flow, about 135 Us GPH @ 4psi, 120+ Us GPH @ 6psi. factory preset at 12 psi @ 110 Us GPH

Carter P4600HP flows 100 Us Gph free flow. No further info found

Edelbrock pumps flows 110 & 120GPH free flow according to their specs, no further info.

Steward Warner 240A, ?

Bosch 044 - 80GPH @ 72,5 psi.

The more pressure a pump has to deliver the less GPH is pumped by the pump. That’s why we are not interested in free flow numbers given by the manufacturers.

Modern fuel pump calculators calculate:

250 bhp you´ll need 24 GPH @ 4 - 7 psi, that’s about max a Facet Dura Lift (40290) can handle.
350 bhp you’ll need 33 GPH @ 4 - 7 psi, so that leaves a Facet Red & Blue Top out.
400 bhp you’ll need 37 GPH @ 4 – 7 psi.
500 bhp you’ll need 50 GPH
600 bhp you’ll need 60 GPH

4 psi for the weber carbs, 7 psi for a Holley carb.

Facet Red & Blue top pumps flow just 20 GHP @ 4psi while Holley recommends 7 psi at idle, and a minimum 4 psi at engine redline for their carbs. So that rules a Facet pump out when running a Holley carburetor on any engine above 200 bhp or running more than one carb on any engine above 150bhp.

You also don’t want to be on the edge of a pumps capacity cause as the pump wears it affects its GPH.
Especially the Facet Red & Blue wears out fast. Unless you don’t drive that often.
Plunger pumps are not forgiving on this matter as the bore & seal wear out fast.
Vane pumps, as they wear are more forgiving.

If you run multiple carbs, you’ll have to take into account multiple float chambers have to be filled at the same time and rate. And as multiple carbs have multiple pump jets you’ll need some extra capacity (Volume in GPH) to keep up the demand.

Facet Red or Blue pumps can be used if running them simultaneously.
Red & blue are the same pumps with the difference that the Red has a filter inside and the Blue not (no restriction hence the slightly more GPH).

To ad a common fuel filter,
Malpassi 85mm filterking, flowrate 45 GPH, 10 micron filtration.
If you’r are running a 6-7 PSI factory pre set pump, there’s no need to adjust pressure on a filterking, so Ill assume flowrate still will be around the 40-45 GPH if the pump is capable enough.
Click to expand...
"Carter P4600HP flows 100 Us Gph free flow. No further info found"
I've run this at Bonneville with 620 bhp without problems. It is a vane pump which gives a smooth fuel pressure output, not like a piston pump.
 
J

Jean-Marc

JP very interesting, thank you for this comparative data. I had a bad experience with a Holley that failed after a few hours, it why I look at it carefully. I found out this diagram on the Holley web site, it is much less than what you show in the comparative study? at 5psi it display 50 Gph not 67 ?
1779087935710.png

On the same web site I found in the specs, the curves for the Mallory

1779088238463.png
 
J

JP Verweij

Updated with the latest info.

Thank you all!!!! Its for all of us to benefit from this information.

Keep the info coming please,



Weber’s work best at approx 4 psi of fuel pressure (Not 2 psi like many of the older books stated.)
Holley’s run 6-7 psi fuel pressure.
You need Volume not Pressure to keep the float bowl full of any carburetor.

Fuel level in the bowl also has major influence on the fuel mixture, as the level also affects the level in the emulsion tubes where fuel & air are mixing together.

Fuel pump specifications: US GPH

Facet silver Top, 36 GPH free flow, 23 GPH @ 2 psi. 11.5 GPH @ 4 psi.
Facet Red Top, 40 GPH free flow, 35 GPH @ 2 psi. 20 GPH @ 4 psi
Facet Blue Top, 45 GPH, 38 GPH @ 2 psi. 23 GPH @ 4 psi

Facet Dura Lift 40285, 33 GPH Free Flow, 4-7 psi @ no flow.
Facet Dura Lift 40222, 33 GPH Free Flow, 17 GPH @ 4 psi 9-11 psi @ no flow,
Facet Dura Lift 40290, 50 GPH Free Flow, 20 GPH @ 8 psi 12-15 psi @ no flow,

Holley Red flows 97 Us GPH free flow - 71 GPH @ 4 psi, 50 GPH @ 5psi, 25 @ 6psi
Holley Blue flows 110 GPH free flow, 88 GPH @ 9 psi
Holley Black flows 140 GPH free flow, 120 GPH @ 9 psi

Mallory Comp 110, 110 GPH free flow, about 95+ GPH at 4psi, about 90 GPH @ 6psi. Factory preset at 7psi @ 20 GPH.
Mallory Comp 140, 140 free flow, about 135 GPH @ 4psi, 120+ GPH @ 7psi. factory preset at 12 psi @ 110 GPH

Carter P4600HP flows 100 Us Gph free flow, 50 GPH @ 4.5 psi

Edelbrock pumps flows 110 & 120GPH free flow according to their specs, no further info.

Steward Warner 240A, ? would like info on that.

Bosch 044 - 80GPH @ 72,5 psi.

The more pressure a pump has to deliver the less GPH is pumped by the pump. That’s why we are not interested in free flow numbers given by the manufacturers.

Modern fuel pump calculators calculate:

250 bhp you´ll need 24 GPH @ 4 - 7 psi, that’s about max a Facet Dura Lift (40290) can handle.
350 bhp you’ll need 33 GPH @ 4 - 7 psi, so that leaves a Facet Red & Blue Top out.
400 bhp you’ll need 37 GPH @ 4 – 7 psi.
500 bhp you’ll need 50 GPH
600 bhp you’ll need 60 GPH

4 psi for the weber carbs, 7 psi for a Holley carb.

Facet Red & Blue top pumps flow just 20 GHP @ 4psi while Holley recommends 7 psi at idle, and a minimum 4 psi at engine redline for their carbs. So that rules a Facet pump out when running a Holley carburetor on any engine above 200 bhp or running more than one carb on any engine above 150bhp.

You also don’t want to be on the edge of a pumps capacity cause as the pump wears it affects its GPH.
Especially the Facet Red & Blue wears out fast. Unless you don’t drive that often.
Plunger pumps are not forgiving on this matter as the bore & seal wear out fast.
Vane pumps, as they wear are more forgiving.

If you run multiple carbs, you’ll have to take into account multiple float chambers have to be filled at the same time and rate. And as multiple carbs have multiple pump jets you’ll need some extra capacity (Volume in GPH) to keep up the demand.

Facet Red or Blue pumps can be used if running them simultaneously.
Red & blue are the same pumps with the difference that the Red has a filter inside and the Blue not (no restriction hence the slightly more GPH).

To ad a common fuel filter,
Malpassi 85mm filterking, flowrate 45 GPH, 10 micron filtration.
If you’r are running a 6-7 PSI factory pre set pump, there’s no need to adjust pressure on a filterking, so Ill assume flowrate still will be around the 40-45 GPH if the pump is capable enough.
 
K

Mark H.

Supporter
So something didn't sit well with my initial post concerning SW240-A pumps, so went back and looked at the actual 240 performance data in the SW Service Instructions for volume: "25 seconds or less" to fill a pint container. I remebered testing the pumps I rebuilt and got a pint every 18-21 seconds depending on the individual pump. I'm sure pint fill rate performance is dependent on voltage supplied, line length & size, restrictions, temp. etc... However at 25 seconds, the lower limit of performance, that's only 18 gph, so two pumps for a 500 hp engine. Maybe that is why there were two 240's on the original MKII's with a third in reserve? Sorry for the mistake and deleted my initial posts to avoid confusion.
 
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