![]() |
Register or Log In To remove these advertisements. |
|
|
![]() |
|
Thread Tools | Display Modes |
|
![]() |
#1 |
Registered User
Join Date: Jan 2003
Location: Guntown,MS
Posts: 172
|
LOOONG Weekend! Goodbye carb hello EFI!
Let's see...started Friday night about 8pm and finished up Monday Morning about 4am.
Things completed:
So yah, it was a long weekend, but made alot of progress!! Friday Night Sunday Night ![]() ![]()
__________________
1985 K10 Under Severe Reconstructive Surgery 5.3/New Paint/New Interior/Yadda Yadda Yadda |
![]() |
![]() |
![]() |
#2 |
Registered User
Join Date: Nov 2011
Location: yucca valley,ca
Posts: 206
|
Re: LOOONG Weekend! Goodbye carb hello EFI!
Better check your fuel pressure at the fuel rail when I ran through the tank selector valve it pushed my tail pressure in excess of 100 psi.
Posted via Mobile Device |
![]() |
![]() |
![]() |
#3 |
Registered User
Join Date: Jan 2003
Location: Guntown,MS
Posts: 172
|
Re: LOOONG Weekend! Goodbye carb hello EFI!
I'll do that! Thanks for the suggestion.
Did you find out what was causing it? Selector valve not letting the return flow well enough and pushing through the regulator creating excess pressure? Posted via Mobile Device
__________________
1985 K10 Under Severe Reconstructive Surgery 5.3/New Paint/New Interior/Yadda Yadda Yadda |
![]() |
![]() |
![]() |
#4 | |
Windy Corner of a Dirty Street
Join Date: Jun 2003
Location: Pueblo West, Colorado
Posts: 2,926
|
Re: LOOONG Weekend! Goodbye carb hello EFI!
Quote:
![]() I agree with chebyshortbox, the stock Pollock dual tank switch valve only has a 5/16 return port, which I found to be too restrictive causing the head pressure to sky rocket up near 100 PSI like he mentioned and I could not find any other switch valves on the market with a bigger return port. If you think about it, fuel pressure is regulated on the return side anyway. If there is a restriction on the return line anywhere, the supply line pressure goes up. An actual pressure regulator is just a controlled restriction while a tiny return line through the switch valve is too much restriction. I have no idea how Hotrod lane pulled off using a stock switch valve. I even called the supplier Pollock and they did not recommend using their dual tank valves for higher pressures above TBI type pressure (12 PSI). On my truck I have an EP381 fuel pump in the LH tank then use a center mounted diesel transfer pump to move fuel from the RH tank to the LH tank for fill-ups on the fly. Same operation the diesel guys use with their big auxiliary bed mounted diesel tanks. Thinking of changing the center mounted transfer pump to low pressure in tank TBI fuel pump this summer though just to speed up the transfer process. I do not use the dual tank switch valve for anything other than sweeping back and forth to check tank levels (no fuel lines are going to my switch valve at all).
__________________
Current vehicle collection: 1978 Chevrolet K10, 8.1L, NV4500, NP205 1989 Chevrolet Suburban, 8.1L, NV4500, NP241 1993 Chevrolet C1500 Sportside, TBI 7.4L, 4L60E 2001 Chevrolet K2500HD, Ext Cab, SWB, 8.1L, ZF 6 speed 2014 Chevrolet Impala LTZ 3.6L Vortec 8.1L because life is too short to tolerate underpowered vehicles
|
|
![]() |
![]() |
![]() |
#5 |
Registered User
Join Date: Sep 2012
Location: TX
Posts: 1,014
|
Re: LOOONG Weekend! Goodbye carb hello EFI!
Also a lot of people have problems with their AC switch killing the truck when they slow down and turn in somewhere. Its cause in the newer trucks the selector unit in the dash shuts the AC off for the turn. The older trucks don't have it, and it kills the truck. People wonder why their truck is always just dying at random. Well its not random its when you slow down and turn.
|
![]() |
![]() |
![]() |
#6 |
Parts and more parts
Join Date: Nov 2003
Location: Lebo, Kansas (middle of nowhere
Posts: 6,821
|
Re: LOOONG Weekend! Goodbye carb hello EFI!
Please describe to me, your fuel pump setup. You have two fuel tanks with electric pumps in each? If so, then how are you controlling them? I thought the 87s had only one tank. I am interseted as I have an 84, that I would like to upgrade.
__________________
Frank |
![]() |
![]() |
![]() |
#7 |
BAD BOW-Silverado XST
Join Date: May 2000
Location: Senior Member from Austin, TX
Posts: 6,431
|
Re: LOOONG Weekend! Goodbye carb hello EFI!
You can buy pumps that fit stock gas tank. Follow this 77 LS conversion.
http://www.hotrodlane.cc/77chevytruck/77chevy.htm |
![]() |
![]() |
![]() |
#8 |
Registered User
Join Date: Jan 2003
Location: Guntown,MS
Posts: 172
|
Re: LOOONG Weekend! Goodbye carb hello EFI!
Does the selector valve add additional restriction? Because from the factory, trucks with LS motors have 3/8 feed and 5/16 return. So the line size should be just fine.
I'll check the fuel pressure and see what I've got. You guys have me worried now. haha. I read through Glock's thread about his swap, and he never mentioned anything about excess pressure, so it's something I hadn't thought about. That's a good idea about the transfer pump. How do you have it plumbed? Edit: Just saw your comment about Pollak's response...says right on the selector valve max PSI of 65.
__________________
1985 K10 Under Severe Reconstructive Surgery 5.3/New Paint/New Interior/Yadda Yadda Yadda |
![]() |
![]() |
![]() |
#9 | |
Windy Corner of a Dirty Street
Join Date: Jun 2003
Location: Pueblo West, Colorado
Posts: 2,926
|
Re: LOOONG Weekend! Goodbye carb hello EFI!
Quote:
None the less, sounds like you are in good shape with the return line size! As far as my Aux tank, the fuel gets sucked out by way of a 6.5L diesel lift pump then dumps into the LH tank through a fitting I put in the top of the sending unit.
__________________
Current vehicle collection: 1978 Chevrolet K10, 8.1L, NV4500, NP205 1989 Chevrolet Suburban, 8.1L, NV4500, NP241 1993 Chevrolet C1500 Sportside, TBI 7.4L, 4L60E 2001 Chevrolet K2500HD, Ext Cab, SWB, 8.1L, ZF 6 speed 2014 Chevrolet Impala LTZ 3.6L Vortec 8.1L because life is too short to tolerate underpowered vehicles
|
|
![]() |
![]() |
![]() |
#10 |
Chevys Kick A$$
Join Date: Jan 2005
Location: Zootown, MT
Posts: 12,699
|
Re: LOOONG Weekend! Goodbye carb hello EFI!
Sweet good job on the swap. Looks great and sounds good as well. Now go out and put some miles on it and test it all out haha
![]()
__________________
*HOODS is what I answer too* -'79, '77, '88 Pickup Sold, '85 Camaro, '83 T/A, '81,'83,'90 K5 Blazer All Sold ![]() -'79 3/4 ton "Big Yellow Bananna" Lifted 4spd. 39.5 TSL Swampers, The money Pit ![]() ![]() -'86 K5 Blazer Silverado 6.2 4" lift 35"s -'95 Ext. Cab Shorty 4" Tuff Country rolling 35" M/T's -'83 Monte Carlo T-Tops. 126,500 Original Miles -LATER ![]() I would rather push a Chevy then drive a ford!!
![]() |
![]() |
![]() |
![]() |
Bookmarks |
|
|