 Manual Fuel pump switch, and tips |
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| ONTHEGRIND |
 Nov 22 2008, 01:20 PM
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Member  Group: Members Posts: 286 Joined: 10-November 08 From: California Member No.: 9,738 Region Association: None  |
so I am installing a new bosch fuel pump for my factory fuel injection system.. Where my factory fuel pump used to one in the stock location, one of the mounting tabs is gone from a little bit of rust, so I am moving it to the firewall. And mounting it with sheet metal screws.. Any body have a manual fuel pump switch wired up so if that relay crap decides not to work I can just flip it on with a switch.. where do you have it mounted and how do you have it wired up ?
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| Spoke |
Nov 22 2008, 06:07 PM
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#2
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Jerry Group: Members Posts: 7,370 Joined: 29-October 04 From: Allentown, PA Member No.: 3,031 Region Association: None 
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Most folks don't do a manual switch because it is inherently dangerous to have high pressure FI pump on at all times. If you have an accident and fuel lines damaged, a constant on FI pump could pump out a lot of gas.
Why did you put the new pump on? Was the old pump working or leaking? Did you try connecting a wire from ground to the fuel pump enable wire on connector T4b? If the pump runs with the key on, then the problem is with the FI brain. With the key on, this will test to see if the relays turn on. With the key on, you should hear a click of the fuel pump relay. Likewise, have someone turn the key on and check the power supply relay clicks. |
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| ONTHEGRIND |
Nov 22 2008, 06:14 PM
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#3
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Member Group: Members Posts: 286 Joined: 10-November 08 From: California Member No.: 9,738 Region Association: None |
QUOTE(Spoke @ Nov 22 2008, 04:07 PM)  Most folks don't do a manual switch because it is inherently dangerous to have high pressure FI pump on at all times. If you have an accident and fuel lines damaged, a constant on FI pump could pump out a lot of gas. Why did you put the new pump on? Was the old pump working or leaking? Did you try connecting a wire from ground to the fuel pump enable wire on connector T4b? If the pump runs with the key on, then the problem is with the FI brain. With the key on, this will test to see if the relays turn on. With the key on, you should hear a click of the fuel pump relay. Likewise, have someone turn the key on and check the power supply relay clicks. No I have not tried that yet what do I do take a wire from tb4 in the pics and ground it ? I hate electrics.. |
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| Spoke |
Nov 22 2008, 06:28 PM
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#4
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Jerry Group: Members Posts: 7,370 Joined: 29-October 04 From: Allentown, PA Member No.: 3,031 Region Association: None
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QUOTE(ONTHEGRIND @ Nov 22 2008, 07:14 PM) No I have not tried that yet what do I do take a wire from tb4 in the pics and ground it ? I hate electrics.. Yes but be careful. The other spades may have power on them. Just touch the one in the pic to ground. |
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Posts in this topic
ONTHEGRIND Manual Fuel pump switch Nov 22 2008, 01:20 PM
ONTHEGRIND Nobody has done a manual switch ? I just put in a... Nov 22 2008, 03:52 PM Dave_Darling There are two relays that control the fuel pump. ... Nov 22 2008, 04:41 PM
ONTHEGRIND
There are two relays that control the fuel pump. ... Nov 22 2008, 06:53 PM southernmost914
There are two relays that control the fuel pump.... Nov 22 2008, 07:06 PM ONTHEGRIND Dave I am not looking to hack I am looking to f... Nov 22 2008, 04:58 PM markb As Dave stated, if the board goes bad, having the ... Nov 22 2008, 05:08 PM r_towle get two new relays.
Put on in the correct socket f... Nov 22 2008, 05:20 PM ONTHEGRIND Hmm instresting car was driving fine took it for... Nov 22 2008, 05:21 PM markb The car is new to you. It probably has been sittin... Nov 22 2008, 05:24 PM ONTHEGRIND I have been cleaning the grounds as Igo threw i... Nov 22 2008, 05:34 PM markb There's a ground post in front and below the r... Nov 22 2008, 06:25 PM ONTHEGRIND I put a wire from tb4 to a ground when I put it ... Nov 22 2008, 06:40 PM Spoke
I put a wire from tb4 to a ground when I put it... Nov 22 2008, 10:40 PM bperry
I put a wire from tb4 to a ground when I put it... Nov 23 2008, 03:32 AM Spoke
Pin II and IV are tied together and are +12v whil... Nov 23 2008, 08:22 AM McMark To really solve the issue, you're gonna need t... Nov 23 2008, 12:12 AM ONTHEGRIND THank you for the replies I am up at 7:30 gonna h... Nov 23 2008, 09:36 AM Dave_Darling Which fuel injection system does your car have? T... Nov 23 2008, 06:44 PM ONTHEGRIND I went on pbanders page started to work from the ... Nov 23 2008, 06:52 PM ONTHEGRIND As you can see I moved the pump and added some new... Nov 23 2008, 07:00 PM ONTHEGRIND In the book it shows it going the other way ? top... Nov 23 2008, 07:29 PM ONTHEGRIND Swaped the lines droped the car put 2 gallons of f... Nov 23 2008, 07:43 PM markb If the fuel lines were as bad as you say, you need... Nov 23 2008, 10:38 PM Dave_Darling The filter you have on there is a cheap low-pressu... Nov 24 2008, 12:40 AM ONTHEGRIND
The filter you have on there is a cheap low-press... Nov 24 2008, 12:55 AM ONTHEGRIND Car Runs but seems to have still have a problem.... Dec 1 2008, 07:38 PM Cap'n Krusty
Car Runs but seems to have still have a problem... Dec 1 2008, 07:42 PM ONTHEGRIND
Car Runs but seems to have still have a proble... Dec 1 2008, 07:59 PM ONTHEGRIND Swapped the fuse to red firred it up made it ten ... Dec 1 2008, 08:10 PM ONTHEGRIND Any guess ? Dec 2 2008, 10:19 AM Spoke You mentioned wd40 everything. For electrical item... Dec 2 2008, 11:03 AM ONTHEGRIND Spoke I also have heen doing that the reason f... Dec 2 2008, 11:19 AM ONTHEGRIND http://smg.photobucket.com/albums/v236/xr8...nt=10... Dec 2 2008, 11:31 AM |
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