Holding Fuel Pressure after Shutdown
Discussion
exitwound said:
Just reading this again and it sounds like your describing my own system..
Key to prime, soon as the ecu sees rotation, the fuel pump relay energises for a few seconds, but then the oil pressure comes up and the 12v feed to the pump then comes from the ecu, via the oil pump switch to keep it all running. The fuel pump relay only runs for a few seconds at the beginning to prime the rail.
Oil pressure is irrelevant and is not taken into consideration.Key to prime, soon as the ecu sees rotation, the fuel pump relay energises for a few seconds, but then the oil pressure comes up and the 12v feed to the pump then comes from the ecu, via the oil pump switch to keep it all running. The fuel pump relay only runs for a few seconds at the beginning to prime the rail.
exitwound said:
Cheers.
Sounds like my 30 year old motor system gives it a good chance to live again while it can still rotate, ..comforting, as the oil filter does sit kind of low to the extent that I'm not comfortable using those K&N oil filters with the big nut underneath..
Killing the engine based on that simple ( and often faulty ) switch without any care given to actual driving conditions could be an accident waiting to happen.Sounds like my 30 year old motor system gives it a good chance to live again while it can still rotate, ..comforting, as the oil filter does sit kind of low to the extent that I'm not comfortable using those K&N oil filters with the big nut underneath..
That's why few if any OEM's will ever do it.
stevieturbo said:
exitwound said:
Cheers.
Sounds like my 30 year old motor system gives it a good chance to live again while it can still rotate, ..comforting, as the oil filter does sit kind of low to the extent that I'm not comfortable using those K&N oil filters with the big nut underneath..
Killing the engine based on that simple ( and often faulty ) switch without any care given to actual driving conditions could be an accident waiting to happen.Sounds like my 30 year old motor system gives it a good chance to live again while it can still rotate, ..comforting, as the oil filter does sit kind of low to the extent that I'm not comfortable using those K&N oil filters with the big nut underneath..
That's why few if any OEM's will ever do it.
Don't know where the implication of careless driving comes from, but I've been driving and self maintaining the Corvette for over ten years/100k miles. The only time it sees a garage is for an mot or tyres. I haven't lowered the car, but I'm acutely aware of the ground clearance and drive accordingly especially as I live out in the country, so your quite safe, ..there's no "accidents waiting to happen" in my world.
However, I can't say that for the modern stuff if what you say is true that, the fuel will only shut off when the motor seizes solid! Something basically wrong and possibly dangerous with that. We'll let the viewers decide..
At least my system would give me warning of impending doom, ...before my eye gets drawn to the pressure guage.
exitwound said:
There's never been a manufacturer problem with that switch that I can find out and I did research that one in depth after I was getting a stalling issue when hot a while back. That problem turned out to be the HEI ignition module failing when it got hot.
Don't know where the implication of careless driving comes from, but I've been driving and self maintaining the Corvette for over ten years/100k miles. The only time it sees a garage is for an mot or tyres. I haven't lowered the car, but I'm acutely aware of the ground clearance and drive accordingly especially as I live out in the country, so your quite safe, ..there's no "accidents waiting to happen" in my world.
However, I can't say that for the modern stuff if what you say is true that, the fuel will only shut off when the motor seizes solid! Something basically wrong and possibly dangerous with that. We'll let the viewers decide..
At least my system would give me warning of impending doom, ...before my eye gets drawn to the pressure guage.
Whilst you may be a very sedate driver....manufacturers cannot base every build around that, but I'm sure they would love it if they could.Don't know where the implication of careless driving comes from, but I've been driving and self maintaining the Corvette for over ten years/100k miles. The only time it sees a garage is for an mot or tyres. I haven't lowered the car, but I'm acutely aware of the ground clearance and drive accordingly especially as I live out in the country, so your quite safe, ..there's no "accidents waiting to happen" in my world.
However, I can't say that for the modern stuff if what you say is true that, the fuel will only shut off when the motor seizes solid! Something basically wrong and possibly dangerous with that. We'll let the viewers decide..
At least my system would give me warning of impending doom, ...before my eye gets drawn to the pressure guage.
And you have a strange fear of oil system failure leading to engine death !
That too is also not that common, but of course it can happen.....TBH I can only think of one or two instances where anyone was foolish enough to keep driving their car until it has seized solid, and being linked to an oil pressure switch really wont have made any difference by that stage !
And what I say is how virtually every modern ( and normal ) petrol injection fuel system operates.
Gassing Station | Engines & Drivetrain | Top of Page | What's New | My Stuff