I had problems getting my Bosch 044 (intank) pump to make enough psi to start the engine. I hard wired it directly to the battery, and it shot right up to 50psi and started with no problems. Well I went through the shop manual and found where it said to use a jumper wire to connect the f/p and gnd terminals in the Diagnosis Connector. (discussed on page F-100 in the Fuel and Emissions section) By doing this the pump worked beautifully. What I need to know is what does this mean? What do i need to do to fix the problem? Thanks in advance guys and gals.
p.s. I tried to attatch the file, but I don't know if it worked or not. |
Basically it means that your Bosch pump doesn't like to be run under 12 volts. You can just go into the fuel pump relay and make it a permanent 12 volts. Search for the username "Dragon" and "Fuel Pump Relay". Chris did a thread on how to do it. Works like a charm.
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Originally Posted by jspecracer7' post='802942' date='Feb 20 2006, 03:34 AM
Basically it means that your Bosch pump doesn't like to be run under 12 volts. You can just go into the fuel pump relay and make it a permanent 12 volts. Search for the username "Dragon" and "Fuel Pump Relay". Chris did a thread on how to do it. Works like a charm. |
If you did the "dragon fuel relay" trick, you wouldn't have to worry! It really does work. However, you'll need to retune your driving range (take out fuel)
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Well here's the problem. If you're talking about the fuel pump relay that sits right by the radiator, I don't have one. The spot is empty. I previous owner said something about it being wired directly to the alternator (but he couldn't remember for sure). Out of curiousity I tested the voltage going to the pump with and without the jumper wire. Both times it came up the same (10V assuming I read the multimeter correctly). So the jumper wire isn't increasing the voltage. What do I do now?????
Thanks for your continued help Jspec. |
i had the same problem...but my pumps wouldnt come on at all.....i just did the jump wire mod ( same as you did) in the diag. box and just left it.... https://www.nopistons.com/forums/pub...DIR#>/cool.png
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Originally Posted by 7passu' post='803474' date='Feb 22 2006, 05:42 PM
i had the same problem...but my pumps wouldnt come on at all.....i just did the jump wire mod ( same as you did) in the diag. box and just left it.... https://www.nopistons.com/forums/pub...DIR#>/cool.png |
Does anyone know what the "jumper wire" bypasses? Is somehing not grounded properly?
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Something keeps drainging my battery too. I have to charge it up every few days. All I'm doing is connecting the battery too the car, checking a few things with the pumps, (maybe cranking it over and letting it run for a minute or two) and disconnecting it again. ?????
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recgarding not getting enough volts try rewireing with a higher gauge wire to let more power through also the wire may have degraded over time. trying this as a last resort may help
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