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Fuel cut off on long left-hand sweeper at half-tank...
So another issue at the track the other day was that at half a tank of gas on a long left-hand sweeper (averaging 70-80 mph) the fuel cut out on me and the car shut off. I had to wait for the straight and crank it up a couple times to get it running again. This totally sucked! This happened to me once before at 1/4 tank, but I admit I was harder on the car this time.
Anyways, I heard the fix for this is to get a Series 2 pump. (I have a 2005 Series 1 RX-8.)
Excuse me! But what kind of a waste of a response is that????
I’m looking for a mature response.
I wasted my time even writing this response back.
It's common at 1/4 tank
I've heard it said it can damage your engine, so you want to avoid it.
Only prevention I know is to not let it get that low if you plan on high speed turns.
I don't think the fuel pump helps, but I could be wrong.
Excuse me! But what kind of a waste of a response is that????
I’m looking for a mature response.
I wasted my time even writing this response back.
It’s the kind that as one of the most prolific posters of information on this forum has the right to say when someone not only doesn’t bother to look and see that this is one of the most discussed topics having multiple threads here, but also thinks they’re special and deserve to start another one just for their own pleasure. Be a real man next time and try to at least make a basic effort on your own before expecting a handout. Otherwise you kicking the slats out of your crib, throwing your rattler on the floor, and screaming loudly for not getting your own way is not any surprise.
This is a well known issue... with MANY threads and solutions posted
The spoon feeding picture was a dig to get you to at least do a cursory search before you ask a question.
Depending on a lot of issues you have many options...
Depending on if you have class rules to worry about or specific goals you might have to go to different solutions...
Read up and then come back and you likely will get a better response
Understood. I appreciate the input. I thought that initial response was a dig to "being spoon fed."
To be honest, I did an initial search after I initially had the issue at 1/4 tank and saw MANY posts on the fuel cutting out on high speed long turns, but they all seemed to state that 1/4 was the cut off point. I arrived at the same track recently with a full tank to avoid this issue, but was surprised when this occurred at HALF a tank. That's why I posted.
Thanks again.
Excuse me! But what kind of a waste of a response is that????
I’m looking for a mature response.
I wasted my time even writing this response back.
It’s the kind that as one of the most prolific posters of information on this forum has the right to say when someone not only doesn’t bother to look and see that this is one of the most discussed topics having multiple threads here, but also thinks they’re special and deserve to start another one just for their own pleasure. Be a real man next time and try to at least make a basic effort on your own before expecting a handout. This forum exists for a reason and who are you to expect the same people to keep repeating themselves over and over again at the whim of each person that comes here to find out.
Otherwise kicking the slats out of your crib, throwing your rattler on the floor, and screaming loudly for not getting your own way is not any surprise.
It’s the kind that as one of the most prolific posters of information on this forum has the right to say when someone not only doesn’t bother to look and see that this is one of the most discussed topics having multiple threads here, but also thinks they’re special and deserve to start another one just for their own pleasure. Be a real man next time and try to at least make a basic effort on your own before expecting a handout. This forum exists for a reason and who are you to expect the same people to keep repeating themselves over and over again at the whim of each person that comes here to find out.
Otherwise kicking the slats out of your crib, throwing your rattler on the floor, and screaming loudly for not getting your own way is not any surprise.
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Fair enough.
I did a search, but my concern is that this occurred at HALF a tank (not 1/4) and that I may have a different issue. That's why I posted buddy.
Last edited by REXTurboS; Aug 18, 2019 at 05:40 PM.
at least 100 people thought the same thing opening this and the other pointless new thread you started rather than adding your comments to the most relevant existing one on the same subject. There’s a reason a bunch of pointless crap comes up when you try to search; threads like this.
Now you had to go and be humorless to the point of taking the other comment seriously ...
It’s the kind that as one of the most prolific posters of information on this forum has the right to say when someone not only doesn’t bother to look and see that this is one of the most discussed topics having multiple threads here, but also thinks they’re special and deserve to start another one just for their own pleasure. Be a real man next time and try to at least make a basic effort on your own before expecting a handout. This forum exists for a reason and who are you to expect the same people to keep repeating themselves over and over again at the whim of each person that comes here to find out.
Otherwise kicking the slats out of your crib, throwing your rattler on the floor, and screaming loudly for not getting your own way is not any surprise.
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.
Prolific posters don't usually double post responses.
There's a track I visit regularly with a long high speed left hander that exits up hill. It's almost flat through the turn. With a factory fresh series 2 pump, I will get fuel cut out at half a tank of gas after exiting the turn and half way up the hill. I'm pulling 1.3-1.4G through the turn. I'm not sure how much of a difference the hill makes, but I think the fact that it is almost full throttle for a long period of time makes it worse.
Back when I had less grip, and less ability, I could run it down to 1/3 of a tank. Less cornering g's and more time off the gas for the fuel pump to recover.
Also, when running on track, the gas gauge is not always accurate. So it may not show 1/2 tank when it is already at 1/2 tank.
My current solution is to fill up between every session, or at least any session >20 min since 40min is about as long as I can run without risking cut-outs... This is a pain, so I'd like to do something better.
There's a track I visit regularly with a long high speed left hander that exits up hill. It's almost flat through the turn. With a factory fresh series 2 pump, I will get fuel cut out at half a tank of gas after exiting the turn and half way up the hill. I'm pulling 1.3-1.4G through the turn. I'm not sure how much of a difference the hill makes, but I think the fact that it is almost full throttle for a long period of time makes it worse.
Back when I had less grip, and less ability, I could run it down to 1/3 of a tank. Less cornering g's and more time off the gas for the fuel pump to recover.
Also, when running on track, the gas gauge is not always accurate. So it may not show 1/2 tank when it is already at 1/2 tank.
My current solution is to fill up between every session, or at least any session >20 min since 40min is about as long as I can run without risking cut-outs... This is a pain, so I'd like to do something better.
Ah ..........I've been holding off fitting the S2 pump in my turbo setup as I didn't think it would help under extreme conditions. I'll do the same as what you are doing for my next track session ...thanks.
Since we seem to be elaborating a lot more on here than I though...
I started with an upgraded pump in the stock basket with an NA car it would do OK until about 1/4 tank on street grip level tires. When I went to slicks it would cut out a lot earlier with extended corners.
So I went to another stock pump in the passenger side... with check valves to keep them from backing up into each other with the siphon still connected.
That was good NA and I didn't have issues till the fuel was quite low.
When I went low power turbo it worked OK as long as I stayed on streetish tires. Slicks would make it act up about 1/2 to 1/3 tank and was only an issue in specific turns... like Blu. As a side note... I also had oil pressure issues at the same time and lost a motor. Went to a dry sump 🙄.
When I upped the power level I went to a surge tank with a Bosch 044 as a pressure pump. That worked well until recently when I replaced the Bosch 044 with the AEM high flow pump that fit in the 044 spot. I suddenly had issues with getting the base fuel pressure down to below 50psi. What I figured out was that the flow level from the AEM and the 2 feed pumps was overwhelming the return ( stock feed line). Found out the siphon pump was too much of a restriction to allow the pressure to drop. So now I have 2 feed pumps and an AEM E85 comparable high pressure pump with all new -6 lines for feed and return
So far all is good... no constipation problems with the return and enough flow for 550 WHP and more
This is why we say there are lots of options... if I was running in a race series that didn't allow much fuel system mods I would be screwed as I didn't find anything simple that works
The S2 pump module will help a lot and it’s a much better design overall than an S1 pump module. IMO that and a Holley hydramat to replace the OE siphon pickup on the non-pump side is likely to be enough for most people with an NA Renesis. You guys with 400 hp+ setups are not in the same situation as a NA Renesis so it kind of shades up things for the others.
Ah ..........I've been holding off fitting the S2 pump in my turbo setup as I didn't think it would help under extreme conditions. I'll do the same as what you are doing for my next track session ...thanks.
Somehow I figured you'd have a "better than s2 pump" solution already.
Yes, in my case, going from a completely stock s1 setup to an s2 fuel pump, and then back to an s1 pump (new one installed under the Mazda recall), I didn't actually notice a significant real world difference. It's possible the s2 pump does work a little better, and so I might be able to get more time on track from a tank, but in either case I ended up having fuel cut out after 40-50 min of hard driving at Thunderhill (my worst case track). So either way I need to fill up between every 20-30 min session.
