HELP ME!!! running out of fuel---FIXED

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madrx7S2
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HELP ME!!! running out of fuel---FIXED

#1 Post by madrx7S2 » Wed Aug 23, 2006 8:30 pm

Running out of fuel when l step on it, changed from carter to new holly blue with reg and still same problem, wtf is going on, can SOMEONE please help , look ed at all tech section on webbers but nothing,

13b bp
48ida weber(already jetted)
holly blue and reg set at 5 psi
std fuel line and return line, 3/8 l think

Has anyone had same problem?
Last edited by madrx7S2 on Fri Aug 25, 2006 10:45 pm, edited 1 time in total.


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sa22c13b
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#2 Post by sa22c13b » Wed Aug 23, 2006 8:38 pm

yea m8 same prob



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#3 Post by Rotoholic » Wed Aug 23, 2006 8:44 pm

Did you check the volts going to the pump ?

You should also say with your carter, as you rev it the fuel pressure drops out to 1 psi :shock:


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#4 Post by madrx7S2 » Wed Aug 23, 2006 8:51 pm

Rotoholic wrote:Did you check the volts going to the pump ?

You should also say with your carter, as you rev it the fuel pressure drops out to 1 psi :shock:
Will have to rig up pressure gauge on windscreen for a run to see what it is doing
Do l need to install 1/2" lines for volume as well nor not?
what should be the right volts at the pump when its on.

And yours is a flat spot not running out of fuel, well thats what it says.


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#5 Post by sa22c13b » Wed Aug 23, 2006 9:09 pm

soz i thought thats wat u meant good luck neway



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#6 Post by ASG_00D » Wed Aug 23, 2006 10:15 pm

try putting a restrictor in your return line ... it worked 4 me


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#7 Post by Rotoholic » Thu Aug 24, 2006 1:14 am

^^ he has tried even to the extent of blocking it off all together :x

Chris, should be at 12v, I dunno just have a hunch that the powers going down as the rpm going up :? .

Might to time to get bigger lines.

(did you change the fitting from the holley reg to a bigger size?)


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#8 Post by madrx7S2 » Thu Aug 24, 2006 5:59 am

yea tried bloking the return line altogether and no go

will try for 12 volts might have to track wires inside of car or just make new ones straight of battery, and yes did change fittings on reg and pump


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#9 Post by sim_rx3 » Thu Aug 24, 2006 8:13 am

please tell me you didnt connect it to the original pump power supply???

run a relay that is switched by the original fuel circuit and 12 volt supply from the battery.


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#10 Post by madrx7S2 » Thu Aug 24, 2006 5:45 pm

sim_rx3 wrote:please tell me you didnt connect it to the original pump power supply???

run a relay that is switched by the original fuel circuit and 12 volt supply from the battery.
If the original wires come though floor, then yes opps :(

can you send me wiring diagram on how to do it please, that would be great. even a simple picture will do


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#11 Post by rxk40s » Thu Aug 24, 2006 5:49 pm

Have you changed fuel filter yet?


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#12 Post by madrx7S2 » Thu Aug 24, 2006 5:58 pm

yes changed filter no only 1 filter and even without it there is no difference still runs out, for example on dyno in 4th does power run and can't get past 6000rpm without it running out of fuel to keep going. only just starting to make power as well,


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#13 Post by Rotoholic » Thu Aug 24, 2006 6:24 pm

madrx7S2 wrote: can you send me wiring diagram on how to do it please, that would be great. even a simple picture will do
Its easy. Mount a relay somewhere near your pump. Run one a wire from your battery or 12v power sorse to the appropriate connecter on relay, then run your original wire to the appropriate connecter then lastly run the last connecter off relay to your pump.

Easier than it sounds :oops: Pop round and ill show you the relays ive done on my 4, Ive even got a brand new relay lying round you can have 8)


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#14 Post by Dat.rota » Thu Aug 24, 2006 7:51 pm

This is something I have experienced with my race car! if you have blocked the return line and still could not keep the fuel up then I would be surprised that the holley can not keep up! Check the size of your needle and seat it should be 3mm and also check that your float level is set correctly I had problems with leaning out in the top end changed fuel jets and up the fuel pressure with no result with a back to basics approach i found that the float level in my webber was set to low and it would suck the float bowl dry! once set correctly no more leaning out even on the track afer winding out to 200klms on oran main straight!



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#15 Post by Dat.rota » Thu Aug 24, 2006 7:53 pm

This is something I have experienced with my race car! if you have blocked the return line and still could not keep the fuel up then I would be surprised that the holley can not keep up! Check the size of your needle and seat it should be 3mm and also check that your float level is set correctly I had problems with leaning out in the top end changed fuel jets and up the fuel pressure with no result with a back to basics approach i found that the float level in my webber was set to low and it would suck the float bowl dry! once set correctly no more leaning out even on the track afer winding out to 200klms on oran main straight!



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