Stavros

How hard would it be to rig up a warning light/buzzer to activates if a fuel pump fails?

Its not ideal but i got 3 fuelpumps in my car (feeder pump from tank to swirlpot and 2x 044s feeding engine) and a bit worried about one failing and blammo...

I cant look at the pressure gauge all time, and a warning light on thats no good unless iw as happy for it to be lit apart from at full boost...

Any ideas?

bud-weis

probably be too late by the time the light comes on anyway wouldn't it.

Spiky

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how long after the fact there is less/no fuel in there that the EGT's would rise/engine melt?


would several EGT' gauges be enough????

Stavros

I was thinking an EGT would tell you too late, but a fuel one MIGHT save you..

But any methods il appreciate info on!

Spiky

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my engine not quite as expensive as yours, but i think i'd like this feature too...


wonder if the new SECS might have this feature????

RichardPON

I can't see that it'd help too much.

Much like an oil pressure gauge - by the time the gauge reads hugely low pressure, the engine's fooked anyway.

I like the idea, but i the pumps are new, and the wiring is good, then it'd be some kind of freak fault that'd cause a pump to fail, and you're never gonna eliminate all the possibilities...

Rossco

Fuel pressure gauge??

Stavros

You might have a point. And yea, the pumps are new as will the wiring be.

Err...

foreigneRS

i would get a microcontroller steve. you could have one with several analog inputs and monitor battery voltage, fuel pump voltage, fuel pressure, MAP pressure and stuff and have it trigger an alarm if pressure drops. that's the best way i reckon, but would cost probably 1 or 200 if you could find someone to build and program it. cheaper than a melted engine though.

Eagle

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you can get adjustable pressure switches .. just connect a loud buzzer to the contacts ..once the pressure drops you get loud noise... just need to find one that can cope with petrol and the correct operating pressure.... and there im lost
farnell or radio spares might have one..

Andreas

Dunno if it helps or not but I got a voltmeter connected to the pump to warn me if voltage drops.

Also got a fuelpressure gauge but its useless on a turbo car with a rising fuel pressure. Ive suggested to SPA to make a fuel pressure/boost gauge that work on a turbo car, ie the low fuel pressure warning level rises and drops with the boost pressure.

standard warning level + current boost = new warning level

3,3 bar + 1,0 bar boost = 4,3 bar low pressure warning at 1,0bar of boost.

Project ST

The only realistic way I can imagine is to monitor the current flow. The easiest way is to fit inline ammeters but even then, a seized pump can still draw a lot of current.

Basically, if it's that much of a concern, you *should* be looking at your fuel pressure gauge a fair amount.

Having management that can adjust to compensate for a suddenly-weakened mixture would be the way forward.

/al

St3V3_C

Does your Fuel pressure gauge have a warning output? You can use that if you use a warning output from a boost gauge as well.

So, set the FP warning at anything below say 80psi, and your boost warning at 30psi.

Join these 2 in series, and the light will only show when boost is over 30psi AND FP is less than 80psi

CozzyBrom

i run a presure switch in the fuel line if it drops below a set presure the light comes on and shuts the ecu down
this is over rided on start up threw the starter botton

RichardPON

Hey - what a cool idea

St3V3_C

Except that you must have the pressure set for the lowest level (i.e. over run) so you will not know if the pressure hasd risen with boost surely

foreigneRS

yeah, that doesn't sound ideal as the lowest pressure that you will see with a closed throttle will be about 3 bar, and if you have the switch set to that it will only cut out at 3 bar. not much good if you're running nearly 2 bar of boost and should have nearly 5 bar fuel pressure.

Stu @ M Developments

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AFR warning based on boost pressure is simplest surely?

Spiky

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what would be needed for that stu???

Stu @ M Developments

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Well...

This ideally:
https://passionford.com/forum/viewtopic.php?t=97837

Spiky

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