Who Else is running Edlebrock Pro Flow 1 EFI - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**1970 CST Short Wide** · 06-03-2014, 10:57 AM

I just installed an Edlebrock Pro Flow 1 system and am having a small problem with it wanting to surge at Idle I get it to calm down and run real nice then after letting it set for 10 minutes or so we’re back to surging. I'm told it may be a tank venting problem.
My question is how and where did you vent you gas tank. Mine is still behind the seat I did install a return line to the sender, is there room to vent there also and if so where do you vent to? Just outside??

LSUMurse · 06-03-2014, 11:02 AM

I have no experience with this but, what about a vented gas cap?

**1970 CST Short Wide** · 06-03-2014, 11:55 AM

Quote:

Originally Posted by LSUMurse

I have no experience with this but, what about a vented gas cap?

I have a vented locking cap but still get a suction noise when removing it: yet you can blow through it so it’s not clogged I’m wondering if a vent should be a certain size like 3/8 or ???

**1970 CST Short Wide** · 06-04-2014, 11:26 AM

Ttt

pwdcougar · 06-04-2014, 11:41 AM

How does it run with the cap off? I'd try a different cap. It sounds like the cap is not venting when it is closed all the way. There shouldn't be a sucking sound when it is removed.

Paul

70blackfish · 06-04-2014, 12:45 PM

and with cap off???

**1970 CST Short Wide** · 06-09-2014, 02:28 PM

Quote:

Originally Posted by 70blackfish

and with cap off???

I haven’t had time to even look at the truck this week, my youngest daughter graduated from Dental school on Thursday. She’s now officially “Dr. Kristina D.D.S” so we partied most of the week end. I’m going to take the cap off and drive it to see if that does it. If so then guess I’ll be putting in a vent line.
My question now is how big does a vent line need to be? Guess I’ll be calling Edlebrock at least one more time

LSUMurse · 06-09-2014, 03:48 PM

There's a vent line for sale on the board, right now.

http://67-72chevytrucks.com/vboard/s...d.php?t=631734

Z10 · 06-09-2014, 04:12 PM

I installed a FIRST TPI system using the factory tank (see build thread below for more detail). I simply drilled a very small hole in the valve on the bottom of the fuel cap and it's been working just fine.

**1970 CST Short Wide** · 06-09-2014, 05:51 PM

Quote:

Originally Posted by Z10

I installed a FIRST TPI system using the factory tank (see build thread below for more detail). I simply drilled a very small hole in the valve on the bottom of the fuel cap and it's been working just fine.

NICE Truck. Would you have a pic of the hole you drilled in the cap. I have a locking cap and CAN blow through it I just dont think its enough

Z10 · 06-10-2014, 07:29 PM

Here you go. Some really small holes. Let me know how it works for you?

**1970 CST Short Wide** · 06-16-2014, 02:26 PM

Thanks Z10. I have a locking cap so I'll get a standard one and give it a shot. Steering box blew a seal on Friday so since it’s about the only thing I haven replaced I put a new PS box on it Sunday. Ran around with cap off and seemed to help a bit but did NOT solve the hunting when cold and in gear problem. Suspect we have more tuning to do.
Thanks for the input

06-03-2014, 10:57 AM	#1
1970 CST Short Wide Senior Moment Join Date: Mar 2002 Location: Pittsburg Ca Posts: 4,108	Who Else is running Edlebrock Pro Flow 1 EFI I just installed an Edlebrock Pro Flow 1 system and am having a small problem with it wanting to surge at Idle I get it to calm down and run real nice then after letting it set for 10 minutes or so we’re back to surging. I'm told it may be a tank venting problem. My question is how and where did you vent you gas tank. Mine is still behind the seat I did install a return line to the sender, is there room to vent there also and if so where do you vent to? Just outside?? Attached Images __________________ 1970 CST LS 1 6 speed Ford 9 inch Detroit Tru Track, Dakota Didgital, Vintage Air, QA1 Coil Overs Front & Rear Lots of FUN 2013 GMC PU, Oldest Son 71 GMC LWB. QA1 Suspension, Angry SB. Youngest Son 2019 GMC Diesil Dually. Youngest Son 2017 Toyota SUV Daughters car 2018 Traverse , Wife’s Ride Pittsburg Ca 94565

06-03-2014, 11:02 AM	#2
LSUMurse Registered User Join Date: Mar 2012 Location: New Orleans, La Posts: 406	Re: Who Else is running Edlebrock Pro Flow 1 EFI I have no experience with this but, what about a vented gas cap? __________________ It's not that I am apathetic, I just don't care. If your life is a joke, it appears death will be your punchline.

06-04-2014, 11:26 AM	#4
1970 CST Short Wide Senior Moment Join Date: Mar 2002 Location: Pittsburg Ca Posts: 4,108	Re: Who Else is running Edlebrock Pro Flow 1 EFI Ttt __________________ 1970 CST LS 1 6 speed Ford 9 inch Detroit Tru Track, Dakota Didgital, Vintage Air, QA1 Coil Overs Front & Rear Lots of FUN 2013 GMC PU, Oldest Son 71 GMC LWB. QA1 Suspension, Angry SB. Youngest Son 2019 GMC Diesil Dually. Youngest Son 2017 Toyota SUV Daughters car 2018 Traverse , Wife’s Ride Pittsburg Ca 94565

06-04-2014, 11:41 AM	#5
pwdcougar Registered User Join Date: Oct 2013 Location: New Jersey Posts: 1,302	Re: Who Else is running Edlebrock Pro Flow 1 EFI How does it run with the cap off? I'd try a different cap. It sounds like the cap is not venting when it is closed all the way. There shouldn't be a sucking sound when it is removed. Paul __________________ "You know that little thing in your head that keeps you from saying things you shouldn't? Yeah well, I don't have one of those" 1969 Mercury Cougar Standard 4 speed 1969 Mercury Cougar XR7 convertible 1970 4WD Chevrolet Suburban 1997 4WD Chevrolet Silverado Extended Cab Short Bed (purchased new January 1997)

06-04-2014, 12:45 PM	#6
70blackfish Registered User Join Date: Oct 2012 Location: Newhall CA Posts: 1,195	Re: Who Else is running Edlebrock Pro Flow 1 EFI and with cap off??? __________________ 69 SWB 780hp Hellcat powered, manual 6 speed, currie 9

06-09-2014, 03:48 PM	#8
LSUMurse Registered User Join Date: Mar 2012 Location: New Orleans, La Posts: 406	Re: Who Else is running Edlebrock Pro Flow 1 EFI There's a vent line for sale on the board, right now. http://67-72chevytrucks.com/vboard/s...d.php?t=631734 __________________ It's not that I am apathetic, I just don't care. If your life is a joke, it appears death will be your punchline.

06-09-2014, 04:12 PM	#9
Z10 Registered User Join Date: Aug 2012 Location: Midland, TX Posts: 1,267	Re: Who Else is running Edlebrock Pro Flow 1 EFI I installed a FIRST TPI system using the factory tank (see build thread below for more detail). I simply drilled a very small hole in the valve on the bottom of the fuel cap and it's been working just fine. __________________ 1969 RS/SS Z10 Camaro Pace coupe 1972 GMC Short Step buildhttp://67-72chevytrucks.com/vboard/s...=1#post6356218 1979 Mazda RX7 1979 Pontiac Trans Am WS6 & 1979 Pontiac Trans Am 10th Anniversary 1999 Honda Valkyrie 2006 Corvette Z06 2010 BMW 650i

06-10-2014, 07:29 PM	#11
Z10 Registered User Join Date: Aug 2012 Location: Midland, TX Posts: 1,267	Re: Who Else is running Edlebrock Pro Flow 1 EFI Here you go. Some really small holes. Let me know how it works for you? Attached Images __________________ 1969 RS/SS Z10 Camaro Pace coupe 1972 GMC Short Step buildhttp://67-72chevytrucks.com/vboard/s...=1#post6356218 1979 Mazda RX7 1979 Pontiac Trans Am WS6 & 1979 Pontiac Trans Am 10th Anniversary 1999 Honda Valkyrie 2006 Corvette Z06 2010 BMW 650i

06-16-2014, 02:26 PM	#12
1970 CST Short Wide Senior Moment Join Date: Mar 2002 Location: Pittsburg Ca Posts: 4,108	Re: Who Else is running Edlebrock Pro Flow 1 EFI Thanks Z10. I have a locking cap so I'll get a standard one and give it a shot. Steering box blew a seal on Friday so since it’s about the only thing I haven replaced I put a new PS box on it Sunday. Ran around with cap off and seemed to help a bit but did NOT solve the hunting when cold and in gear problem. Suspect we have more tuning to do. Thanks for the input __________________ 1970 CST LS 1 6 speed Ford 9 inch Detroit Tru Track, Dakota Didgital, Vintage Air, QA1 Coil Overs Front & Rear Lots of FUN 2013 GMC PU, Oldest Son 71 GMC LWB. QA1 Suspension, Angry SB. Youngest Son 2019 GMC Diesil Dually. Youngest Son 2017 Toyota SUV Daughters car 2018 Traverse , Wife’s Ride Pittsburg Ca 94565



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