Fuel Pump Placement

bigjim5551212 · 03-20-2008

So, I dont know a lot about Opels, but...regarding fuel pumps. I see that Stefanlee tried a new pump and it would not suck the fuel.

Electric fuel pumps are pushers and not pullers. So when you have an electric fuel pump, you need it by the tank.

For a mechanical pump, they are pullers of fuel, so it is ok to have it on the motor.

jvandyke · 03-20-2008

I moved my electric from the engine bay to the tank. Went from 19 gph to 25 gph. Although the 19 gph was probably enough for most carbs.

bigjim5551212 · 03-20-2008

could you imagine the speed and fuel economy you would get if you actually used 25 gph?

jvandyke · 03-20-2008

Speed sounds good, fuel consumption not so much! I'm told certain carbs (I've got a 38/38) have relatively small bowls and can, when the need is great, need quite a flow for brief periods to keep the bowl full. All can vouch for at this point is my 38 seems to be sucking the tank down REALLY fast! Once I get things sorted a bit I'll have to check my mileage. I bet it's not even 15 mpg at the moment.

03-20-2008	#1 (permalink)
bigjim5551212 Weber Carburetor Guru Join Date: Jan 2008 Location: Vancouver Canada Posts: 129 Provided Answers: 1	Unanswered: Fuel Pump Placement So, I dont know a lot about Opels, but...regarding fuel pumps. I see that Stefanlee tried a new pump and it would not suck the fuel. Electric fuel pumps are pushers and not pullers. So when you have an electric fuel pump, you need it by the tank. For a mechanical pump, they are pullers of fuel, so it is ok to have it on the motor.

03-20-2008	#2 (permalink)
jvandyke Opeler Join Date: May 2006 Location: Hudsonville, Michigan, USA Posts: 1,794	I moved my electric from the engine bay to the tank. Went from 19 gph to 25 gph. Although the 19 gph was probably enough for most carbs. __________________ "Being ignorant is not so much a shame, as being unwilling to learn." Benjamin Franklin

03-20-2008	#4 (permalink)
jvandyke Opeler Join Date: May 2006 Location: Hudsonville, Michigan, USA Posts: 1,794	Speed sounds good, fuel consumption not so much! I'm told certain carbs (I've got a 38/38) have relatively small bowls and can, when the need is great, need quite a flow for brief periods to keep the bowl full. All can vouch for at this point is my 38 seems to be sucking the tank down REALLY fast! Once I get things sorted a bit I'll have to check my mileage. I bet it's not even 15 mpg at the moment. __________________ "Being ignorant is not so much a shame, as being unwilling to learn." Benjamin Franklin

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03-20-2008	#3 (permalink)
bigjim5551212 Weber Carburetor Guru Join Date: Jan 2008 Location: Vancouver Canada Posts: 129 Provided Answers: 1	could you imagine the speed and fuel economy you would get if you actually used 25 gph?

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