Alan B
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| posted on 28/11/10 at 01:28 PM |
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External EFI fuel pump question
After my in-tank (Honda Civic) fuel pump ceased working I replaced it with an external Summit racing unit. At first all seemed well...started up
fine...ran well....but it's very noisy. I don't just mean a consistent, but loud pumping noise, but also other strange noises, also it
gets quite hot. This alone wouldn't cause me too much grief if it was normal, but to make matters worse it acts like it's not keeping up,
stalling a couple of times just while idling. One time it stopped completely having blown a 20A fuse on the main power supply.
Any ideas?....some fundamental problem of my doing?.....dodgy pump?
Cheers,
Alan
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tomgregory2000
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| posted on 28/11/10 at 03:19 PM |
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Sounds like a dodgy pump to me, i have a bosch 044 external pump fitted and its a noisey whine that varies depending on load on the pump
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ko_racer
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| posted on 28/11/10 at 03:58 PM |
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I'd also check the current rating on the fuel pump. I know the 044 needs up to 30A, so you may need to run a seperate supply and relayfor the
external pump.
They are noisy too, but can be rubber miunted to reduce it abit
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atspeed racing
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| posted on 7/12/10 at 12:00 PM |
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assuming the pump is/was fine.
check your install, sounds like cavitation problems to me if its getting hot. the pumps dont last long if they are not sucking up fuel and WILL make a
lot of noise and get hot. they may also be ok until the fuel demand gets greater, e.g. fne at idle, but problem occurs once you start driving or go
around a corner.
external EFI pumps do not suck up fuel well, but they pump lots. they ideally need a large volume of fuel on the back of the pump, and large diameter
pipe going into it (AN - 8 / 10mm for example) and either below fuel tank, or below a swirl pot.
here is my fuel install in my pug 106.
bmw m3 in tank pump (i recommend a walbro 255 as an intank pump)
fills the swirl pot (pre filtered) -8 fitting to the 044, to the engine via -6 (filtered) and return to the pot and tank in -6.
volume of fuel in the swirl pot keeps weight on the back of the pump, so no cavitation occurs.
- colin.
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