Fuel pump alternative
Discussion
226bhp said:
Yes I read it. So how is the car still running after 'tens of minutes' if the swirl pot isn't being fed?
The core question regards the unreliability of the fuel lift pump which pumps fuel from the tank to the swirl pot. The average life seems to be around 20000 miles, perhaps a bit more. I think they should last at least five times longer. Id like advice which:1 Proposes a more reliable pump or
2 Highlights an error in the circuit design
One pump has been proposed and a different pump has been suggested, I'd like more suggestions or examples of similar installations please.
Steve_D said:
Perhaps the issue is that there are times when the lift pump is running dry which will kill it in short order.
Is there scope for a new tank design. A tank of an inverted pyramid design would ensure a constant feed to the pump up until the point you have the car on its side.
Steve
Hi,Is there scope for a new tank design. A tank of an inverted pyramid design would ensure a constant feed to the pump up until the point you have the car on its side.
Steve
that is the odd thing, other than when I have completely drained the tank the pump is never heard running dry. The tank has a vee-section where the pick up is located, I try to keep at least 15 litres in when green laning (because I've run out of petrol once before and prefer walking for pleasure not necessity!).
I can't understand the reason for the short life other than the suggestion by one reply that maybe the pump doesn't have enough of a restriction so runs near to full speed for it's entire life.
I've purchased a combined fuel pressure regulator / sediment bowl along with another spare pump. I'll fit the regulator, increase the restriction and see what the result is. I am sure that the engine will receive plenty of fuel even if the lift pump runs at half the flow rate; I rarely use WOT so the fuel from the rail return will make up the difference when I do and if not, will return the unused fuel to the tank.
Thank you for the interest!
100SRV
Steve_D said:
Perhaps the issue is that there are times when the lift pump is running dry which will kill it in short order.
Is there scope for a new tank design. A tank of an inverted pyramid design would ensure a constant feed to the pump up until the point you have the car on its side.
Steve
This is what i'm getting at, it doesn't need to be complicated. There is no reason why a single properly installed/fed pump won't do 100k miles....Is there scope for a new tank design. A tank of an inverted pyramid design would ensure a constant feed to the pump up until the point you have the car on its side.
Steve
stevieturbo said:
Max_Torque said:
Use a modern submerged "Turbine" type pump as your lift pump, ideally speed controlled with a PWM drive if you really want maximum life!
Presumably as he currently uses an old external Facet, moving to a modern in-tank pump would be a rather big proposition.On my old Comp Safari racer we had a horrible flat shaped tank (due to trying to package it in the front and not have it collected by the front axle/diff), and we ended up with 3 lift pumps, all running at once in various "corners" of the tank, all pumping back into an internal swirl pot, in which was an normal intank, pressure pump. Worked really well, even on very extreme terrain, but certainly complex to do.
"Quite a time at silly angles"
Could be your pick up pipe amends time sucking air, that will "do the pump in"
Have you thought about a swing pickup pipe like race bike oil pickup and redesigned tank
A wild thought also says 3 pipes, 1 either end and center feeding to 1 pipe to lift pump
Could be your pick up pipe amends time sucking air, that will "do the pump in"
Have you thought about a swing pickup pipe like race bike oil pickup and redesigned tank
A wild thought also says 3 pipes, 1 either end and center feeding to 1 pipe to lift pump
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