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cobra94563 |
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Chris ![]() ![]() Group: Members Posts: 341 Joined: 1-March 05 From: San Francisco Member No.: 3,696 ![]() |
I have an overheating fuel pump in the front trunk. I think it overheats because of the heat coming off the radiator and screws up the pump enough to so I loose fuel pressure down to 1psi.
The pump is a new holley red w/a holley regulator. The pump gets so hot you cannot keep you hand on it. I iced it down a bit and my pressure immediately comes back up. I considered the heat could be from the pump, but the wiper motors also get too hot to touch. So where do you mount your pump (if not in the front trunk)? Or what kind of pump do you have (if in the front trunk)? ..or maybe I have to cut more openings..? (IMG:style_emoticons/default/idea.gif) |
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cobra94563 |
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#2
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Chris ![]() ![]() Group: Members Posts: 341 Joined: 1-March 05 From: San Francisco Member No.: 3,696 ![]() |
Computer4kids - My pump is similar design to your's, except a holley red.
I measured voltage at the pump is 11.4v (Is that too low?) but off the alternator and at the battery is 12.1v. I may have to wire a direct circuit + relay to power the pump. I will try a sheet metal box around the pump and insulation to protect it from the radiant heat. If it still get hot, maybe it's back to the pump? I thought about using a carter, like I have on my other car, or a mechanical pump (datkotaewing). |
TC 914-8 |
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#3
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Senior Member ![]() ![]() ![]() Group: Members Posts: 812 Joined: 23-May 08 From: Sequim, WA Member No.: 9,090 Region Association: Pacific Northwest ![]() ![]() |
Computer4kids - My pump is similar design to your's, except a holley red. I measured voltage at the pump is 11.4v (Is that too low?) but off the alternator and at the battery is 12.1v. I may have to wire a direct circuit + relay to power the pump. I will try a sheet metal box around the pump and insulation to protect it from the radiant heat. If it still get hot, maybe it's back to the pump? I thought about using a carter, like I have on my other car, or a mechanical pump (datkotaewing). One last thing before you go too far. The 11.VDC is low but should be OK. 10% is a rule of thumb on any electric device, so 12-1.2 is 10.8v min. even then you have charging problems or regulator issues. Most regulators are designed for 14VDC. So the Holley Pump has a plate on the pump end, I think I took one a part once to check the vanes or wipers. You should be able to disassemble it and check for unusual wear and play in the motor bushings. Worn bushings causes binding and the armature can get misaligned in the stator, again causing it to work harder and overheat. If it was AC you could use a AMP Probe to measure the current. being DC you will have to use an amp meter in line with the pump motor and verify the amp draw, unless you have a DC amp probe, If you don't know the rated Current, measure the resistance of the winding between + and - , then E ( Volts) / R (resistance) will give you the rated amps. then compare that to the actual measured amps. The measured Amps should be well below the rated amps, again the 10% rule but below the rated amps. Try a spare pump it's easier and faster. Tony |
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