750 Holley bleeds off fuel pressure through vent?

Light84vette · 02-08-2008, 01:58 AM

Hello forum, I have a 406CID Small block in a C4 with a 750 Holley vacuum secondary carb. I have an 86 electric fuel pump good to 40-50psi and to regulate it I have an aeromotive A1000 fuel pressure regulator.

So what I have done is bend up some 3/8" flared stainless steel tubing to feed the carb, 1line for main 1 for the secondary.

When I first started the engine, fuel pressure was 6-7, then as I backed it out the garage throttle response is sluggish and I recheck the fuel pressure and its 0psi.

Pump is running fine, so then I can hear fuel being circulated and I pinch the feed line to the main throttle and the pressure builds to 6-7. AS Soon as I let go of the line feeding the main after the pressure gauge the fuel goes to zero.

So then I put my finger over the vent and fuel starts dumping into the intake.

Was I wrong in having the regulator supply 1 line for secondary and 1 for the main? Should I plum them into one supply and plug off the other outlet of the regulator? Or have I blown a seal or something? Also I pulled out the float plug checker on the side and adjusting the float level couldnt get any fuel to come out the side.

Light84vette · 02-08-2008, 09:07 PM

Got a new feed line from the autozone. Still doing the same thing, it doesnt build pressure and covering the vents forces fuel out.

mackeyred96 · 02-12-2008, 07:12 PM

That ia the correct regulator, the same one I'm going to use on my car. I'm not sure how you have it plummed. Sounds like the fuel is going direct to by-pass.

Light84vette · 02-14-2008, 03:40 AM

Turned out I had some worn out gaskets, replaced them and it runs fine.

Bent up some 3/8" flared transmission line about 5ft long, one for the primaries and 1 for the secondary and snaked it around to the regulator. Put the regulator in place of the "used to be" heater/blower assembly. Now I dont have to worry about a rubber fuel line getting mushy on me.

mackeyred96 · 02-14-2008, 11:41 PM

Quote:

Originally Posted by Light84vette

Turned out I had some worn out gaskets, replaced them and it runs fine.

Bent up some 3/8" flared transmission line about 5ft long, one for the primaries and 1 for the secondary and snaked it around to the regulator. Put the regulator in place of the "used to be" heater/blower assembly. Now I dont have to worry about a rubber fuel line getting mushy on me.

Sounds good, Rubber hose is a no no