Howell fuel injection question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**Bernie** · 09-10-2013, 06:26 PM

I'm installing the Howell fuel injection system in my truck. I have an Edelbrock Performer manifold and a Mallory Unilite distributor with vacuum advance. My questions for anyone who has done this conversion are : where can I get the vacuum feed for the MAP sensor ? Is it ok to make a T with the PCV valve ? There are two ports on the front of the throttle body, which one connects to the vacuum advance on the distributor ? Can I use the other for the MAP sensor ?
Any help would be very much appreciated.
Bernie

clinebarger · 09-10-2013, 09:04 PM

Needs a dedicated manifold vacuum source, Can be any port BELOW the throttle blades. The throttle body probably has a ported vacuum & manifold vacuum sources. The one that's lower would most likely be manifold vacuum.

**bowtie72** · 09-10-2013, 11:36 PM

If your ECM is going to control timing you will need to lock down your advance plate so it doesn't move. No need for the vacuum advance. I have installed a TBI on my Blazer it runs great.
Posted via Mobile Device

09-10-2013, 06:26 PM	#1
Bernie Senior Member Join Date: Jan 2001 Location: Northern Illinois Posts: 516	Howell fuel injection question I'm installing the Howell fuel injection system in my truck. I have an Edelbrock Performer manifold and a Mallory Unilite distributor with vacuum advance. My questions for anyone who has done this conversion are : where can I get the vacuum feed for the MAP sensor ? Is it ok to make a T with the PCV valve ? There are two ports on the front of the throttle body, which one connects to the vacuum advance on the distributor ? Can I use the other for the MAP sensor ? Any help would be very much appreciated. Bernie __________________ Bernie

09-10-2013, 09:04 PM	#2
clinebarger Senior Member Join Date: May 2009 Location: Fort Worth, TX Posts: 6,370	Re: Howell fuel injection question Needs a dedicated manifold vacuum source, Can be any port BELOW the throttle blades. The throttle body probably has a ported vacuum & manifold vacuum sources. The one that's lower would most likely be manifold vacuum.

09-10-2013, 11:36 PM	#3
bowtie72 Registered User Join Date: Mar 2007 Location: Colorado Posts: 363	Re: Howell fuel injection question If your ECM is going to control timing you will need to lock down your advance plate so it doesn't move. No need for the vacuum advance. I have installed a TBI on my Blazer it runs great. Posted via Mobile Device __________________ 1968 SWB "Little White Truck" 1972 LWB LS 4l80 "Plain Jane!!"



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