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#305119 - 04/22/05 12:18 PM efi conversion ? sending unit  
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tpicamino Offline
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Tn
hi i am trying to find out about thses efi sending units . will the one out a 4.3 elcamino fit in a monte carlo ? i think the buick gn sending unit is the same as the monte carlos ? any info would be great


79 4 speed elcamino , but looking at a monte Ls
#305120 - 04/22/05 06:12 PM Re: efi conversion ? sending unit  
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SStavin Offline
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Pretty much the same I think. You would probably want the gas tank from the donor efi vehicle as well b/c it has the baffle in the tank to prevent pump starvation from sloshing. Here's a really good write up http://www.robertpowersmotorsports.com/EFI_Pump.html

#305121 - 04/22/05 06:31 PM Re: efi conversion ? sending unit  
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87z16 Offline
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traffic island, ny
actually, from my understanding from another guy that has done the conversion, he said the 4.3l and the 3.8l turbo have 2 different pressures. the GN has more. but the 4.3l montes can be used as well, but has less capacity for upgrades.


tom t
1987 Monte Carlo SS Aerocoupe - maroon / maroon w/t-tops
1985 Monte Carlo SS - 1996 LT1, 4L60E, 8.5" posi rear w/3.42 silver / maroon
http://www.1987aerocoupe.homestead.com
#305122 - 04/22/05 06:38 PM Re: efi conversion ? sending unit  
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Gruvin Offline
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Quote:
Originally posted by 87z16:
actually, from my understanding from another guy that has done the conversion, he said the 4.3l and the 3.8l turbo have 2 different pressures. the GN has more. but the 4.3l montes can be used as well, but has less capacity for upgrades.
The two pumps are significantly different. The 4.3 is for TBI and only runs about 13-16 PSI, the GN pump runs between 38 and 65 PSI.


My first SS! Sold Jan 2004
[Linked Image]
87 SS bought 9-5-04: Sold 6-18-2010 - project 87 finds a new home with another undisclosed MonteCarloSS.com member!
#305123 - 04/22/05 07:36 PM Re: efi conversion ? sending unit  
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tpicamino Offline
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ahhh for there is a god !!!!!!
i have been to a few diffrent sites an it like no one wants to answer or just dont know . thanks u guys for the info . does any one have pics of there efi cars and engs ? also any comments on how u guys have ran fuel lines ?
man this is great ! thanks again chad


79 4 speed elcamino , but looking at a monte Ls
#305124 - 04/23/05 12:13 AM Re: efi conversion ? sending unit  
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85SSMan Offline
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Wichita, Kansas
I use a GN sending unit. But either will fit your tank, however you do want to change your tank to an EFI tank for the baffles that are in the EFO tanks. I also am using a GN tank. Check these pics. Check out my Album there are alot of pics from my conversion in there.

http://www.montecarloss.com/cgi-bin/album.pl?album=00005809

PM with questions.

Chris



1985 Monte SS, Rebuilt L69 with TPI. 200-4R Tranny. 951 Modine with TPI duel fans. True 2 1/4 Flowmaster Duals. B.F.H. made dual hump crossmember. Stock Suspension, interior, and body.
SOLD TO INTMDATR3 ON 03/04/06
#305125 - 04/23/05 01:14 AM Re: efi conversion ? sending unit  
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ss4ever Offline
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Shelbina, Missouri
You can use the 4.3 sending unit, you just need to get a different pump. I used a pump from a TPI F-body.
I hope to finish my swap within the next week.


1983 Monte Carlo SS Turnkey ZZ4/700R4, Dakota Digital Instrument Cluster, 77k mile car. Many more mods to come soon.
#305126 - 04/23/05 09:59 AM Re: efi conversion ? sending unit  
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Gruvin Offline
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Quote:
Originally posted by ss4ever:
You can use the 4.3 sending unit, you just need to get a different pump. I used a pump from a TPI F-body.
I also used the 4.3 sending unit BUT... I used the GMC Typhoon pump(4.3 Turbo!) ;\)

I used the charcoal can vent line for the return line as it is 5/16", and the original fuel line. Replace all the rubber hoses with Goodyear highpressure hose and dont forget to cross the lines between the body and the tank or you will have problems with gas in the charcoal can. ;\)


My first SS! Sold Jan 2004
[Linked Image]
87 SS bought 9-5-04: Sold 6-18-2010 - project 87 finds a new home with another undisclosed MonteCarloSS.com member!
#305127 - 04/23/05 10:21 AM Re: efi conversion ? sending unit  
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Smith29180 Offline
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Summerville, SC
I am using a 4.3 tank and sending unit and a Walbro 340 pump and it works great


97 LT1 Built 200R4 True 2 1/2 Dual
Smitty Built CAI and Wiring Harness. But still Peg Leg for Now!!
#305128 - 04/23/05 09:32 PM Re: efi conversion ? sending unit  
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85SSMan Offline
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Wichita, Kansas
I also have the Walbro 340, it came with the Assembly from EBAY at a price of $15 big ones. ;\)



1985 Monte SS, Rebuilt L69 with TPI. 200-4R Tranny. 951 Modine with TPI duel fans. True 2 1/4 Flowmaster Duals. B.F.H. made dual hump crossmember. Stock Suspension, interior, and body.
SOLD TO INTMDATR3 ON 03/04/06
#894446 - 09/11/11 01:28 AM Re: efi conversion ? sending unit [Re: 85SSMan]  
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amanzo00 Offline
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Toronto, ON
Anyone know where I can get a sending unit for EFI in tank pump? Is there something I can ask for at Napa as they did not list anything for the 4.3L V6.

#894462 - 09/11/11 03:49 AM Re: efi conversion ? sending unit [Re: amanzo00]  
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SS Ninja Offline
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Brand new sending units for Grand Nationals are $97 at rockauto.com.

Check out Spectre part number FG156A.

Same thing that a few Grand Nantional vendors are selling for a lot more money last time I checked.

I'm running one without any complaints.


Look into getting a "hot wire" kit at the same time from racetronix or similar:
http://www.racetronix.biz/itemdesc.asp?ic=FPWH%2D006&eq=&Tp=


1987 Monte Carlo SS: The toy
Click here for my build thread
1987 Monte Carlo LS: Daily Driver
Build thread for the LS
#894463 - 09/11/11 04:11 AM Re: efi conversion ? sending unit [Re: SS Ninja]  
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baaboo Offline
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Racine, WI
You can also make one, using your stocker, by adding an intank pump and two wires.


1987 Aerocoupe, 383 Super Ram and 20-gallon custom aluminum tank. Car retired (for now) from open road racing, but I'm not.
#894610 - 09/12/11 01:26 AM Re: efi conversion ? sending unit [Re: baaboo]  
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amanzo00 Offline
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Toronto, ON
Awesome, thanks guys. I will check out that Spectra P/N with Napa.

#894720 - 09/12/11 09:32 PM Re: efi conversion ? sending unit [Re: amanzo00]  
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rons87mcss Offline
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PA
FWIW, I'm sure RockAuto.com is going to give you a much better deal than NAPA if you feel like waiting a few days to receive it. I've ordered several different times from them for various things and have always been happy smile

#894740 - 09/13/11 12:12 AM Re: efi conversion ? sending unit [Re: rons87mcss]  
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Richie Cat Offline
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I use a Bosch inline pump with my stock carbed tank and have no problems. The tank has a baffle to help the gas "stay" by the pickup.


83 SC, 355 w/TPI
#894820 - 09/13/11 04:44 PM Re: efi conversion ? sending unit [Re: Richie Cat]  
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daveSS1987 Offline
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Enfield, CT
Only problem if you are using the Monte/GN sending unit in the El Camino tank is the gas gauge will not work correctly. The El Camino has 2 different sized fuel tanks, most are 22 gallons but some are smaller and both use a different sending unit. The Monte and GN tank are 18 gal? so your gauge will never read correctly.
Dave


1987 Choo Choo Customs El Camino SS with Monte Carlo SS TH200R4, 3.73 posi rear,'87 SS wheels, Edelbrock TES with Flowmasters, S-10 Xtreme spindles & front brakes and custom SS/GN interior w/ power seats, mirrors, antenna, concert sound, etc .... The way GM should have made it in 1987! Coming soon 383 w/ roller cam!
#894839 - 09/13/11 07:17 PM Re: efi conversion ? sending unit [Re: SS Ninja]  
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Fred SS Offline
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Originally Posted By: SS Ninja
Brand new sending units for Grand Nationals are $97 at rockauto.com.

Check out Spectre part number FG156A.

Same thing that a few Grand Nantional vendors are selling for a lot more money last time I checked.

I'm running one without any complaints.


Look into getting a "hot wire" kit at the same time from racetronix or similar:
http://www.racetronix.biz/itemdesc.asp?ic=FPWH%2D006&eq=&Tp=


I have also looked at getting the Grand National sending unit from Rock Auto. But I have a question. The float on the Grand National sending unit is shaped differently than the Monte. The Grand National float is oval shaped and the Monte's float is round. Also, the wire hanger appears to be bent differently. Will this difference affect the fuel level gage reading? I'm sure allot of you guys have used the buick sending unit. Does your fuel gage read correctly?


87 SS, Harwood cowl induction hood, UMI trailing arms. Edelbrock TES Headers (Jet Hot Coated). Goodwrench 350, Ported TPI, Trick Flow 56cc alum heads, SLP runners, Comp Cams 260AH-12 cam, Trick Flow 1.5 roller rockers, Bilsteins, TCI 2400 stall converter, Ramcharger fans, Denny's 3.5" Driveshaft, GBodyParts GNX Wheels.
#895083 - 09/15/11 01:54 AM Re: efi conversion ? sending unit [Re: Fred SS]  
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amanzo00 Offline
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Toronto, ON
Do you guys know how the stock fuel gauge wire is connected to the hotwire kit that now has the 3 wire weather connector from the GN sending unit? Have you guys placed the FG156A GN sending unit in the Monte Carlo GM306C baffled tank then?

#895125 - 09/15/11 12:14 PM Re: efi conversion ? sending unit [Re: amanzo00]  
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amanzo00 Offline
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Toronto, ON
Do you guys know then if that FG156A GN Spectra unit is the same as the AC Delco FLS1114 called out for the 4.3L Monte Carlo?

#896469 - 09/23/11 09:58 PM Re: efi conversion ? sending unit [Re: amanzo00]  
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Fred SS Offline
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Glassboro, NJ
Originally Posted By: amanzo00
Do you guys know then if that FG156A GN Spectra unit is the same as the AC Delco FLS1114 called out for the 4.3L Monte Carlo?


I didn't even know the 4.3L fuel injected Monte Carlo unit was still available. The Grand National unit has bump tube connections for the supply, return and vapor lines. The 4.3L fuel injected Monte unit has a 16mm x 1.5 saginaw o-ring fitting for the supply connection. The vapor and return lines are bump tube. Hope this helps.


87 SS, Harwood cowl induction hood, UMI trailing arms. Edelbrock TES Headers (Jet Hot Coated). Goodwrench 350, Ported TPI, Trick Flow 56cc alum heads, SLP runners, Comp Cams 260AH-12 cam, Trick Flow 1.5 roller rockers, Bilsteins, TCI 2400 stall converter, Ramcharger fans, Denny's 3.5" Driveshaft, GBodyParts GNX Wheels.
#897768 - 10/02/11 01:30 AM Re: efi conversion ? sending unit [Re: Fred SS]  
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amanzo00 Offline
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Toronto, ON
Has anybody modified the fuel sending unit with 1/2" feed and return with -8AN fittings at the end? I am looking for a way to connect -8AN fuel feed and return line and I want to up the size of the tubes on the sending unit if possible.

#897784 - 10/02/11 04:32 AM Re: efi conversion ? sending unit [Re: amanzo00]  
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baaboo Offline
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Racine, WI
I used compression fittings, but only for -6 line. I didn't that I'd need anything bigger.


1987 Aerocoupe, 383 Super Ram and 20-gallon custom aluminum tank. Car retired (for now) from open road racing, but I'm not.
#898578 - 10/08/11 01:23 AM Re: efi conversion ? sending unit [Re: baaboo]  
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amanzo00 Offline
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Toronto, ON
Does anybody know if anyone can modify the feed and return tubes with 7/16" tube and -8AN fittings on the outside and a 3/8" barb fitting for the feed fuel pumb inside?


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