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Fuel starving below 1/2 tank after new fuel pump?

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Fuel starving below 1/2 tank after new fuel pump?
Old October 22nd, 2012, 05:50 PM   #1
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Fuel starving below 1/2 tank after new fuel pump?

I'm running into an issue with my car stalling in turns after I get below a 1/2 tank of gas and below a 1/4 tank it becomes almost undriveable. RSI installed a Walbro 400 back in June during my Engine rebuild and Roe install. Someone just mentioned to me that the fuel basket used was too big? What does that mean?

Other people have this issue?
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Old October 22nd, 2012, 05:51 PM   #2
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Will,

The pump may not be picking up close enough to the bottom of the tank with the modified basket. We can look at it when you trans is back.
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Old October 22nd, 2012, 06:02 PM   #3
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Cool, thanks. See ya next week.

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Old October 22nd, 2012, 06:18 PM   #4
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i was told by DLM and heard at least another tuner say not to boost under half tank
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Old October 22nd, 2012, 10:50 PM   #5
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I don't think the new pump fills the canister like the oem pump. That problem is pretty common when you get away from the oem pump set up. Both acceleration and high G turns can keep the fuel away from the pump intake. In the oem system the pump can also pull from the canister. The oem pump supplies the system while it also fills the canister, therefore guaranteeing fuel is always covering the pick up.
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Old October 23rd, 2012, 11:40 AM   #6
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nice to find out after the fact? is this a new find or they just keep doing this time and time again........
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Old October 23rd, 2012, 12:25 PM   #7
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Ahh, rubber hose.......
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Old October 23rd, 2012, 12:58 PM   #8
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From Kevin at UR. I was talking to him about my new ride and he said "don't boost when it gets under 1/3 tank. I always start looking for gas when it gets to 1/2 tank if I'm going to be running them hard."

I also had the RSI hanger in my SC car and never had any issues.
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Old October 25th, 2012, 05:40 AM   #9
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Just got my car back and was taking it home on a long highway drive. I was between 1/4 tank and empty. When traffic stopped (it was rush hour) it would try to die at idle. Having recently read this post I decided to fill up and see if that fixed the issue. It did. So, I don't know if it's a half tank or 1/4 or 1/8 or what, but there appears to be a problem. I guess as long as I know the sweet spot the fix will be keeping it full. But hopefully I'll get more than 1/2 a tank of use out of it per fillup.
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Old October 25th, 2012, 05:48 AM   #10
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Quote:
Originally Posted by dave6666 View Post
Just got my car back and was taking it home on a long highway drive. I was between 1/4 tank and empty. When traffic stopped (it was rush hour) it would try to die at idle. Having recently read this post I decided to fill up and see if that fixed the issue. It did. So, I don't know if it's a half tank or 1/4 or 1/8 or what, but there appears to be a problem. I guess as long as I know the sweet spot the fix will be keeping it full. But hopefully I'll get more than 1/2 a tank of use out of it per fillup.
I gotta wonder why that is. does the factory setup have problems with this? Will, can you go into some detail as to why this is. it's not a big deal to me anyway, as I worry about running out of gas all the time and typically don't get to a 1/4 of a tank without filling up.
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Old October 25th, 2012, 05:52 AM   #11
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I could run mine till the idiot light came on before the Roe was put on. Never any performance issues at low fuel level.
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Old October 25th, 2012, 06:58 AM   #12
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The issue was already explained earlier in the thread.

The OEM pump refills the basket while it supplies fuel to your engine. The aftermarket pumps do not refill the basket. The basket refills by self leveling of the fuel in the tank. Therefore, at very low fuel levels (roughly 1/8 to 1/4 tank) the basket can run dry on you.

This is nothing new. This has always been the case on builds with aftermarket fuel systems that utilize the stock fuel basket. Refill your fuel tank between 1/2 and 1/4 tank and you have nothing to worry about.
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Old October 25th, 2012, 07:15 AM   #13
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Not that I don't understand the explanation above (because I do...), but just to clarify, my problem had nothing to do with acceleration or high g curves. Sitting in traffic on level pavement. Anyway, filling up at 1/4 tank is no big deal if that's the answer.

Back to my regularly scheduled morning tequila shots.
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Old October 25th, 2012, 07:38 AM   #14
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Quote:
Originally Posted by dave6666 View Post
Not that I don't understand the explanation above (because I do...), but just to clarify, my problem had nothing to do with acceleration or high g curves. Sitting in traffic on level pavement. Anyway, filling up at 1/4 tank is no big deal if that's the answer.

Back to my regularly scheduled morning tequila shots.
Yep. I think the aftermarket pumps are also just slightly shorter than the OEM, which prevents them from picking up fuel effectively when the tank is almost empty.
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Old October 25th, 2012, 09:29 PM   #15
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Originally Posted by Red Snake View Post
Yep. I think the aftermarket pumps are also just slightly shorter than the OEM, which prevents them from picking up fuel effectively when the tank is almost empty.
Is it possible it is not the not the pickup, the pump inlet has to mounted close to the bottom of the bottle. I would think that at 1/4 tank the pump intake would have to be into fuel no matter what pump is used. That tank is rather narrow so the fuel height goes up quickly. At a minimum the resistance of the fuel level switch should be checked to make sure the rise is linear.

Last edited by Jack B; October 25th, 2012 at 09:42 PM.
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Old October 26th, 2012, 01:56 PM   #16
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My triple Walbro 450 set up works fine....down to the idiot fill up light.
Fingers crossed it stays that way.
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Old October 26th, 2012, 02:47 PM   #17
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Originally Posted by Mr. Hollywood View Post
My triple Walbro 450 set up works fine....down to the idiot fill up light.
Fingers crossed it stays that way.
I have the same problem with an aftermarket pump, however, the only time I have issue is at the drag strip or autox, in both cases it is always with slicks where the car accelerates in first gear for a long stretch. In my case the acceleration is forcing the fuel to the back of the tank and when the bottle runs out of residual fuel, it nose dives.

I am taking out the after market 255 lph pump this winter and replacing it will a Gen III pump which is supposed to also be a 255 lph pump. I already have the Gen III pump, it merely needs a different connector. In my case when I ran the nitrous (350 shot) the 255 lph pump and BAP were sufficient. A SC is a little different, but, early on there were several Roe cars doing 650 HP with the oem pump (190 lph) and a BAP.
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Old October 29th, 2012, 01:12 PM   #18
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Quote:
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I already have the Gen III pump, it merely needs a different connector.
Jack- I sent you the connector a while back... you should have it?
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Old October 29th, 2012, 09:05 PM   #19
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This is why I stuck with the stock pump with a KB boost-a-pump, and the 2 Paxton inline pumps with FMU. 909 rwhp and no fuel problems.
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Old October 29th, 2012, 09:09 PM   #20
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Jack- I sent you the connector a while back... you should have it?
just letting the board know they will need the Gen III connector.
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