Visit The Dirt Forum for More Information

Author Topic:   dies on corner exit
donjuan12
Dirt Full Roller

Total posts: 38
posted May 16, 2005 01:18 PM  
We are having a problem with our mod blubbering and dieing coming off the corners. I have checked all float levels and put new needle and seat valves in. We are running the new piston type fuel pump and I replaced it too. Running Barry Grant fuel regulator and replaced it. Took all the foam out of fuel cell and flushed all lines and replaced fuel filter. Running out of ideas and this is getting frustrating. Any ideas would be appreciated.

dpfranklin
Dirt Full Roller

Total posts: 35
posted May 16, 2005 01:43 PM  
Is it keeping fuel pressure? We had a similar problem and it turned out being the fuel filter was in backwards, not letting the fuel flow through very much.

donjuan12
Dirt Full Roller

Total posts: 38
posted May 16, 2005 01:49 PM  
It is losing fuel pressure as soon as he goes into the corner.

rpm20
Dirt Freak

Total posts: 338
posted May 16, 2005 01:58 PM  
wherEs your pickup in your tank, i put a hose on mine and run it to the right rear corner, the last time this happened to me it was that the banking was higher on a track we visited aND IT NEEDED HIGHER THAN USUAL FLOAT LEVELS TO MAINTAIN.
try the pickup route or a higher float level.


quote:
Originally posted by donjuan12:
It is losing fuel pressure as soon as he goes into the corner.


Weld IT!!
Dirt Roller

Total posts: 11
posted May 16, 2005 07:14 PM  
We had the same setup and the same problem.
went to old setup edlebrook pump and wollman valve works perfect!!!!!!!!
Sent the howard stewert pump back and the valve.

uforacing51
Dirt Forum Champ
Total posts: 570
posted May 16, 2005 07:28 PM  
Check to make sure you don't have the fuel filter in backwards in the filter houseing. I know the other post is alot like this but I had a billet housing and paper filter inside of it.

modified8
Dirt Roller

Total posts: 11
posted May 17, 2005 04:29 AM  
we had the same problem, check the gasket in the float bowl when using the blue gasket it pinches the accelerator pump hole off.we put a new gasket in it and it solved the problem.

Ego Racing
Dirt Forum Champ
Total posts: 724
posted May 17, 2005 03:58 PM  
We are having the exact same problem on our late model. Saturday night we soaked the pump, line, regulator and fuel log on Ice soaked rags and it did not have the problem when we went out. During the race there was a red flag condition and it did it again when we restarted the race it did it again. We are running a -10 input line and a 803 regulator. I think it is a problem of the 60 psi the pump hits puts alot of pressure in the line and it takes so long for the motor to use it up under low speed that it heats up to high and is vapor locking. Howard Stewert said it is a bad regulator but I am beginning to wonder about these pumps.
We are going to try a cool can like the drag cars use.

FlyNLoIMCA17
Dirt Forum Champ
Total posts: 753
posted May 17, 2005 04:03 PM  
try letting the car idle up to operating temp. and then shut it off. Go around to the fuel pump and if the fuel is boiling you'll hear it. Maybe the problem is overheating fuel........

spde
Dirt Freak

Total posts: 243
posted May 18, 2005 11:19 AM  
I can say you alot of time. If the car is dieing after the 4 barrel is opened then you need to adjust the accellerator pump. Get the cam kit and dump more fuel in the motor, faster. The cooler temps outside, more dense air, more fuel. I'm saying do this, only if the car is die after the 4 barrels are open. If it is dieing in the middle, or as soon as you get on the gas then you need bigger jets. This is also taking that the jets are not leaning the motor out in the first place. gl ltr

Ego Racing
Dirt Forum Champ
Total posts: 724
posted May 18, 2005 04:03 PM  
quote:
Originally posted by spde:
I can say you alot of time. If the car is dieing after the 4 barrel is opened then you need to adjust the accellerator pump. Get the cam kit and dump more fuel in the motor, faster. The cooler temps outside, more dense air, more fuel. I'm saying do this, only if the car is die after the 4 barrels are open. If it is dieing in the middle, or as soon as you get on the gas then you need bigger jets. This is also taking that the jets are not leaning the motor out in the first place. gl ltr

This would be true if the car had fuel pressure. When this is happening the pressure drops to ZERO and the warning light comes on. THere is no cam or jet adjustment that can help this.

donjuan12
Dirt Full Roller

Total posts: 38
posted May 18, 2005 08:35 PM  
We took our carb apart and found very fine sandy type material in it. We completely rebuilt the carb, took all the fuel lines out and flushed them, and removed the fuel cell bladder and flushed it. We also put a nipple in the end of the fuel pick up to keep it from sucking shut. Will find out if this fixes it this weekend. Thanks for all the help.

spde
Dirt Freak

Total posts: 243
posted May 22, 2005 12:00 AM  
Sorry didn't see the part about the no fuel pressure. Ego, I think if your car is only doing this on caution or red flags, then I would get ride of the regulater and put a bypass valve on. C&S makes one, I have had really good luck with ours. Donjuan if you are running Methanal make sure the supplier is selling you race grade not chemical grade. I have sprint guys buying ful from me that used to get chem grade fuel. The bottom of the barrels where full of cloudy colored fuel. There stuff was the recycled from dry cleaning. As for losing the fuel pressure on entry, sounds like a pick up problem or too much movement in the fuel? or the pump cavitates when you get off the gas. gl ltr

modracer25
Dirt Roller

Total posts: 22
posted May 27, 2005 11:43 PM  
get rid of the stewert pump setup and go back to a belt drive friend had the same problem switched back to a belt drive problem gone they have been having a lot a probs with these pumps call them and ask for the blue spring for it if you want to keep using it they are also very good at losing their prime also thanks erik

showtime13
Dirt Full Roller

Total posts: 60
posted May 30, 2005 06:58 AM  
make sure the open end of the filter is facing towards the motor and u should have a spring inside behinde the filter on the fuel cell side(tank). I would check this before i went and bought all new stuff. Hope this helps!

Ego Racing
Dirt Forum Champ
Total posts: 724
posted June 05, 2005 08:52 PM  
We have tried it all and have only found one thing to help. We put a drag race cool can on the fuel line and insulated the whole thing. It worked great until the ice was gone then when pulling in after the race the pressure went to 0 and the light came on.

racer 4
Dirt Forum Racer

Total posts: 77
posted June 06, 2005 09:12 PM  
if you run foam in your fuel cell be sure the pick up line is not working its way to the top and pulling air if so zip tie a heavy enough bolt or washers to the end of the pickup to insure that it stays where it belongs

speedy46
Dirt Maniac

Total posts: 165
posted June 07, 2005 06:01 PM  
if you have a hose pickup tube you can use a old stock rod, just zip tie it to the pickup hose i used a old bent one out of a blown motor lol

Back to the Archives