Edelbrock 500cfm problems- more of...

mgbv8 · Post by **mgbv8** » Mon May 24, 2010 1:43 pm

bones wrote:I had a problem last year with the pressure moving around alot, took the regulator off and it was fine after that so maybe you could try another reg. Although ive got to put a return pipe in the nos side of it as pressure drops ?? rich

Be very careful about maintaining constant pressure and flow on the nos side Rich. It only takes a couple of seconds on gas for low fuel delivery to melt something

Tom!
Are you dead heading the fuel supply into the regulator?
Are you sure you have a twin outlet reg and not one that has a return connection instead of an outlet?
Are you running twin carbs?

topcatcustom · Post by **topcatcustom** » Mon May 24, 2010 2:10 pm

I will take the pipe off and check the flow, Pel it is an Eddy 500cfm with 2 inlets 1 for each float bowl. The regulator (I'm sure!) can be used as a twin feed or a single feed and return, will dig out the paperwork later if I can find it! tbh I dont have much faith in Holley QC, so I'm sure it either has to be the regulator or pump!!

bones · Post by **bones** » Mon May 24, 2010 2:11 pm

Hi Pel, ive got the std in-tank pump doing the carb and a edelbrock pump for the gas side to get more fuel in plus a low fuel pressure cut out switch. Ive got the pressure high to couneract the drop and remember you saying about fitting a return line for it, but i turning a scrooge and need a cheap way of doing it

rich

mgbv8 · Post by **mgbv8** » Mon May 24, 2010 2:13 pm

topcatproduction wrote:I will take the pipe off and check the flow, Pel it is an Eddy 500cfm with 2 inlets 1 for each float bowl. The regulator (I'm sure!) can be used as a twin feed or a single feed and return, will dig out the paperwork later if I can find it! tbh I dont have much faith in Holley QC, so I'm sure it either has to be the regulator or pump!!

Hmm!
I'll have a look at mine. I'm sure I've got two idnetical looking Holley regs. But one is twin outlet and one is feed and return??

mgbv8 · Post by **mgbv8** » Mon May 24, 2010 2:13 pm

bones wrote:Hi Pel, ive got the std in-tank pump doing the carb and a edelbrock pump for the gas side to get more fuel in plus a low fuel pressure cut out switch. Ive got the pressure high to couneract the drop and remember you saying about fitting a return line for it, but i turning a scrooge and need a cheap way of doing it rich

Bones!
Start another thread about your nos fuel feed. We wont clutter up Toms bit then

Pel

bones · Post by **bones** » Mon May 24, 2010 2:15 pm

TC it should have markings on the reg if its a holley item, my bro had to get one with a rtn outlet and its got rtn stamped on it at one of the side outlets.

rich

topcatcustom · Post by **topcatcustom** » Mon May 24, 2010 2:17 pm

Yeah Rich- feck orf or oil come arfer yous wiv me shotgan!!!

Perry- maybe you're right and the instructions are universal for either type. Though if so why did the pressure read fine for a while and change? If it had 1 side as a return then it would be dumping all that fuel into one side of the carb and flooding it out I'd have thought?

According to Holley http://www.holley.com/12-801-1.asp the red pump pushes at about 7psi, with an internal regulator- could I remove the diaphram from the seperate regulator I have and see what the pump pushes at? If it is 7psi then by the time its 3 metres upstream it must be slightly lower and may be just right? If not I could adjust the in pump reg, but not sure how constant it would be!

bones · Post by **bones** » Mon May 24, 2010 2:40 pm

Not hijacking just had same thing with fuel press with mind of its own, and what caused it,

found this http://www.google.co.uk/imgres?imgurl=h ... s%3Disch:1 . but my bros one has it stamped on reg, the return would have a lower flow i would of thought ,

rich

topcatcustom · Post by **topcatcustom** » Tue May 25, 2010 12:12 pm

Pel- my regulator says "in" on the bottom port and "out" on both side ports, I'm tempted to get a syntec (or whatever make it is!) in line regulator and put it in there before my holley reg, and take the diaphram out of the holley one and just use it as the T piece. That way I get a reliable dedicated regulator and still keep the holley T and gauge.

This is what I have just after my second fuel filter and protrudes from the bonnet behind the blower:

JP. · Post by **JP.** » Fri May 28, 2010 2:37 pm

Ehhhhhhhh please use a Filterking as a pressure regulator.......

You can even mount your gauge on it..

Deal't with your Holley one before and had the same issues as you have.
Switch't over to the Filterking ( from Rally Design ) and all my issues where gone.

topcatcustom · Post by **topcatcustom** » Fri May 28, 2010 3:11 pm

I thought as much! Pretty much decided to pull the internals from the holley regulator and just use it as my T piece. If the pump is too high pressure I will put a filter king regulator or similar in line.

I dread to think what Holley's QC department looks like

"If it looks like it should do- throw it in the box!"

mgbv8 · Post by **mgbv8** » Fri May 28, 2010 4:52 pm

Tom!
Thats the same as both on my car at the mo. But I have a blue pump doing 15psi into the reg for the gas and 7psi into the other reg for the carb. Both seem to adjust and control ok?

The filter king is a well respected reg though.

I've not seen a weber with twin feeds before

Pel