 Relocating Fuel Pump to Front, What's the best power source? |
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| Allan |
 Sep 2 2007, 11:43 AM
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#1
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Teenerless Weenie  Group: Members Posts: 8,373 Joined: 5-July 04 From: Western Mesopotamia Member No.: 2,304 Region Association: Southern California  |
I'm getting ready to move the fuel pump to the front under the tank.
Where is the best place to tap in for power? Seems a whole lot easier to tap into the fuse panel than re-running the wires from the engine bay. I have no relay board if that helps. |
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| Grelber |
Sep 2 2007, 02:33 PM
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Insert favorite Don Rickles joke here. Group: Members Posts: 690 Joined: 30-May 06 From: McKinney, Texas Member No.: 6,107 Region Association: Southwest Region |
Allan: I'm sure this will start a sh*t storm, but Wes Hildreth, our DFW 914 guru puts them under..............the car, not the tank. He mounts them on the tub aft of the steering rack. The skid plate protects it, and you can get to it and the filter easily. Oh, and to add more fuel to the fire, he also taps the fuse block for power, with a separate inline fuse.
Let the storm begin............... |
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| Allan |
Sep 3 2007, 10:25 AM
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#3
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Teenerless Weenie Group: Members Posts: 8,373 Joined: 5-July 04 From: Western Mesopotamia Member No.: 2,304 Region Association: Southern California |
QUOTE(Grelber @ Sep 2 2007, 12:33 PM)  Oh, and to add more fuel to the fire, he also taps the fuse block for power, with a separate inline fuse. Let the storm begin............... So what's wrong with this set-up? (IMG:style_emoticons/default/confused24.gif) Seems like the powers gotta come from there to begin with anyway plus, that's what the pump manufacturer says to do. |
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| Dr Evil |
Sep 3 2007, 10:35 AM
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#4
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Send me your transmission! Group: Members Posts: 22,995 Joined: 21-November 03 From: Loveland, OH 45140 Member No.: 1,372 Region Association: MidAtlantic Region 
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I found it easy to just tap into the power for the pump from the engine bay and run the wires up front. Simple and effective. As for the FP under the skid plate, if it works then even better. I didnt want to cram it up in there when I had my /4, but I also had the beefier 3 nippled pump. The later pump probably fits great there.
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| scotty |
Sep 3 2007, 10:44 AM
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#5
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The Fun Never Stops Group: Members Posts: 773 Joined: 20-May 03 From: Portland. Oregon (SW) Member No.: 718 Region Association: None |
Interesting. I know a stock '75 fuel pump would fit there, what other kinds of fuel pumps fit (i.e. what're you using)?
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| Marlow |
Sep 3 2007, 02:03 PM
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#6
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Member Group: Members Posts: 311 Joined: 14-August 03 From: Manassas, VA Member No.: 1,027 |
The PO relocated the pump on my 74 (3 port Bosch) to the steering rack location. I think he used the AA kit to do it (found instructions in the documents he gave me with the car). It went south and I replaced it with a Walbro inline pump (similar to the two port Bosch pumps used on 75+ cars).
The only problem with wiring the pump to the fuse panel is that it's always hot. Could be a fire hazard in an accident. I believe with both D-Jet and L-Jet the pump will only run when the engine is running. In an accident you don't want the pump to continue running if the engine dies. |
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| SLITS |
Sep 3 2007, 05:01 PM
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"This Utah shit is HARSH!" Group: Benefactors Posts: 13,602 Joined: 22-February 04 From: SoCal Mountains ... Member No.: 1,696 Region Association: None  |
QUOTE(Marlow @ Sep 3 2007, 01:03 PM) The PO relocated the pump on my 74 (3 port Bosch) to the steering rack location. I think he used the AA kit to do it (found instructions in the documents he gave me with the car). It went south and I replaced it with a Walbro inline pump (similar to the two port Bosch pumps used on 75+ cars). The only problem with wiring the pump to the fuse panel is that it's always hot. Could be a fire hazard in an accident. I believe with both D-Jet and L-Jet the pump will only run when the engine is running. In an accident you don't want the pump to continue running if the engine dies. 1.) You can pull switched power from the fuse panel 2.) D-Jet ..... pump runs for a couple of seconds when key is turned on ... then runs continuously when engine has started (signal from brain to pull the relay in). 3.) Don't have an L-jet but I believe the process is similar as the vane in the vane airflow unit moves. 4.) Alan doesn't have a relay board .... to make the fuel pump run continuosly from the relay board you have to jump pins in the relay or jump pins where the EFI harness hooks in. Either way it is switched power so it donna makea no difference ..... fuse panel or relay board. 5.) The real key is to get an oil pressure fuel switch (made by Holley). Allows power when in start postion and from normal source when engine is running, builds oil pressure and closes switch. Benefit .... if engine quits, power to fuel pump gets shut off. |
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| SirAndy |
Sep 3 2007, 07:51 PM
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Resident German Group: Admin Posts: 41,636 Joined: 21-January 03 From: Oakland, Kalifornia Member No.: 179 Region Association: Northern California |
QUOTE(Headrage @ Sep 2 2007, 09:43 AM) Where is the best place to tap in for power? your stock fuelpump connector ... (IMG:style_emoticons/default/shades.gif) you only need to run the 12V from there and use any ground you like near the pump in the front. that way, you get to use the stock pump relay. (IMG:style_emoticons/default/popcorn[1].gif) Andy |
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| DanT |
Sep 3 2007, 07:59 PM
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#9
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Going back to the Dark Side! Group: Members Posts: 4,300 Joined: 4-October 04 From: Auburn, CA Member No.: 2,880 Region Association: None |
QUOTE(SirAndy @ Sep 3 2007, 06:51 PM) QUOTE(Headrage @ Sep 2 2007, 09:43 AM) Where is the best place to tap in for power? your stock fuelpump connector ... (IMG:style_emoticons/default/shades.gif) you only need to run the 12V from there and use any ground you like near the pump in the front. that way, you get to use the stock pump relay. (IMG:style_emoticons/default/popcorn[1].gif) Andy I agree with Andy on this one. my pump runs on power from the original location in back, ran the wires up front to the trunk. Attached image(s)  
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| Allan |
Sep 3 2007, 08:57 PM
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#10
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Teenerless Weenie Group: Members Posts: 8,373 Joined: 5-July 04 From: Western Mesopotamia Member No.: 2,304 Region Association: Southern California |
QUOTE(Dan (Almaden Valley) @ Sep 3 2007, 05:59 PM) QUOTE(SirAndy @ Sep 3 2007, 06:51 PM) QUOTE(Headrage @ Sep 2 2007, 09:43 AM) Where is the best place to tap in for power? your stock fuelpump connector ... (IMG:style_emoticons/default/shades.gif) you only need to run the 12V from there and use any ground you like near the pump in the front. that way, you get to use the stock pump relay. (IMG:style_emoticons/default/popcorn[1].gif) Andy I agree with Andy on this one. my pump runs on power from the original location in back, ran the wires up front to the trunk. I got no relay board. And from what I can see, I would just be running the SAME wire to the front. Why not just do what the supplier suggests? (IMG:style_emoticons/default/blink.gif) |
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| SirAndy |
Sep 3 2007, 10:16 PM
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Resident German Group: Admin Posts: 41,636 Joined: 21-January 03 From: Oakland, Kalifornia Member No.: 179 Region Association: Northern California |
QUOTE(Headrage @ Sep 3 2007, 06:57 PM) because having a relay in the circuit is guud ... (IMG:style_emoticons/default/popcorn[1].gif) Andy |
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