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Fuel cut on hard left turn...


tsitalon1
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Galant VR-4 org Post #: 1069002 posted 05/29/12 09:43 AM     Remind Me!  Send Private Message   Edit Post      
Hey guys,

I've probably had this issue for a while and never noticed because my daily commute doesn't allow for any really hard left turns, but lately I noticed this...

I believe the car has a 1g pump/sending unit installed with the normal inaccurate fuel gauge.

Pump itself is just a RX7 turbo pump.

Is this a pump height issue or something more design related to the tank/baffles?


Edited by tsitalon1 (05/29/12 09:43 AM)

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ktmrider
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Galant VR-4 org Post #: 1069005 posted 05/29/12 10:20 AM     Remind Me!  Send Private Message   Edit Post      
Tank and baffle design play more into the role of fuel "sloshing".

One thing I have heard about is crank thrust bearing tolerance, ie crankwalk, if the car stalls when making hard turns. Hope it ain't the cause tho!



Mike O.
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Terry Posten
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Galant VR-4 org Post #: 1069018 posted 05/29/12 11:31 AM     Remind Me!  Send Private Message   Edit Post      
If I am very low on fuel, and take a fast big sweeping left turn, I will starve the fuel pump and cause a cut-out effect.



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Edited by Terry Posten (05/29/12 11:37 AM)

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MuffinMan7580
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Galant VR-4 org Post #: 1069073 posted 05/29/12 05:06 PM     Remind Me!  Send Private Message   Edit Post      
Quoting ktmrider:

Tank and baffle design play more into the role of fuel "sloshing".

One thing I have heard about is crank thrust bearing tolerance, ie crankwalk, if the car stalls when making hard turns. Hope it ain't the cause tho!




This becomes the case (crankwalk) for 2g DSM's, because they have a crank trigger, which moves too far away from the sensor to be picked up on left hand turns. 1g/GVR4's have no crank trigger.



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Edited by MuffinMan7580 (05/29/12 05:07 PM)

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123abc
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Galant VR-4 org Post #: 1069076 posted 05/29/12 05:26 PM     Remind Me!  Send Private Message   Edit Post      
My 1g did this a lot but I have yet to have it happen to me in my VR4. Make sure you have at least a half tank of fuel before playing I guess....

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DynastyLCD
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Galant VR-4 org Post #: 1069080 posted 05/29/12 06:24 PM     Remind Me!  Send Private Message   Edit Post      
Quoting Terry Posten:

If I am very low on fuel, and take a fast big sweeping left turn, I will starve the fuel pump and cause a cut-out effect.




this. baffles are only working properly when there's enough gas in the tank.



- Phil

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AWDPower
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Galant VR-4 org Post #: 1069102 posted 05/29/12 09:01 PM     Remind Me!  Send Private Message   Edit Post      
A lot of it has to do with tank design. My Talon would do it if the tank was low. I drove an Evo at a track day, and it would cut out if it fell below 1/4 tank. It was on Hoosiers, but I was still suprised that the tank was not better baffled. Miatas, for example, are almost impossible to starve. Some autocrossers will run with the tank almost empty. Be careful, the engine can be damaged by the lean condition. If you are cornering really hard, you can also have the tail kick out on you.



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belize1334
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Galant VR-4 org Post #: 1071564 posted 06/13/12 01:22 PM     Remind Me!  Send Private Message   Edit Post      
Quoting Terry Posten:

If I am very low on fuel, and take a fast big sweeping left turn, I will starve the fuel pump and cause a cut-out effect.



+1. Annoying 'cause I'd like to run autocross on 1/3 tank for weight but if it gets down to 1/4 by the end of the day it'll cut out on left sweapers.



Roger B. Scott
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Galant VR-4 org Post #: 1071604 posted 06/13/12 03:53 PM     Remind Me!  Send Private Message   Edit Post      
My ZJ 5.9 used to do that and I replaced the fuel pump and the problem went away...was a common issue on those for some reason and never figured out why, because the new pump didn't look any different than the old one.

I don't recall if the VR-4 cut out or not, but I don't like running less than a 1/4 tank anyway, so maybe that's why I never experienced it.

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vr4play
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Galant VR-4 org Post #: 1072118 posted 06/17/12 10:29 PM     Remind Me!  Send Private Message   Edit Post   
Both of my cars do it. I have to auto-x with the fuel filled up to fuel cap to not have it happen by the end of 6 runs. It is better after moving the pump a little lower in the tank but it seems like the pump can draw the fuel out of the sump tank faster than it can get back in. I am planning on installing one of these in my auto-x car after I get the engine fixed. Surge Tank

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