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944 race car fuel starvation right turns

944s race car sputters when fuel goes below half a tank -after hard right turn when full throttle is applied. I have read posts that the in-tank strainer/screen can be the problem - I replaced it. Checked the vent line that attaches to the sender that runs to the charc canister - seems fine.

I have pulled the sender unit from the trunk area and inspected in the tank a few times. I.m wondering about the plastic unit (think its called swirl unit) that sits above the screen. Does anyone know if there is a correct way (which way is front) for this to sit. Mine moved around and we put it back in roughly the same place then put the lid with the hole back on and put the sender down in.

I have completely drained the tank, fuel pump in fine, newish fuel filter etc. This only happens below half a tank on right turns.

any suggestions?
Old 06-29-2016, 10:01 AM
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You need a new fuel strainer at the bottom of the tank, PN 928-201-081-04.

http://www.pelicanparts.com/catalog/SuperCat/1021/POR_1021_FULFUL_pg3.htm#item11

We just ran a 924S (early tank) out at Willow Springs and it only started sputtering 3/4 of a lap before it completely died. We didn't even make it back to our pits.
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Last edited by kdjones2000; 06-29-2016 at 10:10 AM..
Old 06-29-2016, 10:07 AM
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I need to replace the one in the 88 S I've gotten back to running condition. Not because it's stopped up, it's because the thing is busted. I was changing the fuel pump out and stuck a long screwdriver into to check for crap in the tank. I gently put it in there a few inches but never felt any resistance at the end. It's like someone has jammed a screw driver in there and knocked the thing apart. I was going to remove it but the threaded bung embedded in the tank wants to turn with it. I'm afraid I'm going to have to remove both items to get it out to replace. Gluing the threaded bung back into the plastic tank is going to be fun. What should I use for that. JB Weld?
Old 06-29-2016, 10:17 AM
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Quote:
Originally Posted by dgcantrell View Post
I need to replace the one in the 88 S
Perfect time to ditch the steel tank and go plastic.
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Old 06-29-2016, 10:45 AM
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i already have replaced the screen and the car has a newer plastic tank

Any other ideas?
Old 06-29-2016, 12:57 PM
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When my race car was doing that it "fixed itself". . .I figured it was a clog in the crossover tubes that allow fuel to go from the left to the right compartment in the tank, and that it cleared. The car used to do it with 3-4 gallons remaining, now it can run down to near dry without doing it.
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This is probably why, on right turns your car has fuel delivery issues. With the top of the baffle no longer connected to the bowl, fuel can spill out and over the "bowl". Now if I cold only get a hand down the hole to re-attach the top.

Old 02-03-2018, 02:47 PM
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I have this same issue on my track car -86 944 turbo.

What is that a picture of?^^
Old 02-04-2018, 06:54 AM
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The whitish thing down at the bottom is the fuel strainer.

What he is saying is that there is an "upside down" bowl at the bottom of the plastic tanks that contains the fuel strainer and the final bit of fuel in the tank.

In this case, the top of that bowl has come off, allowing the fuel to escape the enclosure and let air into the strainer/fuel lines. This leads to cavitation, low fuel pressure and bogging down when coming off turns when your fuel level is low.

This is the first I have seen this, but it's a nice find - just hard to correct short of buying a new fuel tank.
__________________
'88 951S - with LBE, Guru chips, 3Bar FPR, 1.3mm shimmed WG
3300 lbs, 256 RWHP, 15 psig boost
"Certified National PCA Instructor" Hoooohah!
1987 924S 944 SPEC racecar - '88 pistons/DME, short 5th
Old 02-16-2018, 02:26 PM
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