Fuel pump getting burning hot! |
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Fuel pump getting burning hot! |
akellym |
May 11 2007, 02:47 PM
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#1
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Eyes Of The Deep Battle Group: Members Posts: 597 Joined: 25-July 04 From: Annandale, MN Member No.: 2,395 Region Association: Northstar Region |
Okay, so last week the car starting running crappy. checked the fuel pressure, was jumping around then dropped to 0(I have carbs running at 3lbs). So yesterday I installed my brand new back up pump. I was tunning the carbs, everything was going great. After 20mins the car start running crappy again, look at the fuel pressure it was doing the same thing again. Car died, fuel pump wasn't making any noise, checked and it was flaming hot! I have a primary and secondary fuel filter both are clean. Called Mallory they said it must be a bad pump, send it back. Fine, so overnight a new pump install it, this time checking it often. It starts getting hot, what the flip! I can hear the pump changing in pitch, so I think must be elec. I'm getting 13.5v at the pump. My volt reg is rather hot so I put in a new one, now I'm getting 14.2v at the pump. Still getting hot, change the relay( it was hot also) still getting hot!
some pics of the set up. Any suggestions? Attached image(s) |
TROJANMAN |
May 11 2007, 02:52 PM
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#2
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Looks nice in pictures......... Group: Members Posts: 5,268 Joined: 5-March 04 From: Colorado Member No.: 1,753 Region Association: None |
Out of curiosity, do you have a stock pump you can compare to?
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akellym |
May 11 2007, 02:54 PM
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#3
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Eyes Of The Deep Battle Group: Members Posts: 597 Joined: 25-July 04 From: Annandale, MN Member No.: 2,395 Region Association: Northstar Region |
FI pump? Yes I do have, not sure what you mean thou....
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TravisNeff |
May 11 2007, 03:09 PM
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#4
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914 Guru Group: Members Posts: 5,082 Joined: 20-March 03 From: Mesa, AZ Member No.: 447 Region Association: Southwest Region |
Maybe you have a kinked fuel hose or clogged filter/sock in the tank?
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akellym |
May 11 2007, 03:21 PM
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#5
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Eyes Of The Deep Battle Group: Members Posts: 597 Joined: 25-July 04 From: Annandale, MN Member No.: 2,395 Region Association: Northstar Region |
Just check tanks is clean and so is sock. I'm running brake line for fuel except where you see the stainless.
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akellym |
May 11 2007, 04:19 PM
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#6
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Eyes Of The Deep Battle Group: Members Posts: 597 Joined: 25-July 04 From: Annandale, MN Member No.: 2,395 Region Association: Northstar Region |
just tried running a ground direct, was using a harness ground wire. Still no change.
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yarin |
May 11 2007, 05:08 PM
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#7
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'14-X'in FOOL Group: Members Posts: 988 Joined: 13-May 03 From: Guttenberg, NJ Member No.: 693 Region Association: North East States |
Just a wild ass guess, but try to lower the elevation of the pump to tank level. This way the pump has to do less pulling. no?
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Demick |
May 11 2007, 05:23 PM
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#8
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Ernie made me do it! Group: Benefactors Posts: 2,312 Joined: 6-February 03 From: Pleasanton, CA Member No.: 257 |
Fuel pumps aren't really capable of pulling at all. It needs to be gravity fed from the tank to the pump. If your fuel level in the tank drops below the level of the pump, it will starve.
Fill your fuel tank and see if the problem goes away. Demick |
Demick |
May 11 2007, 05:25 PM
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#9
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Ernie made me do it! Group: Benefactors Posts: 2,312 Joined: 6-February 03 From: Pleasanton, CA Member No.: 257 |
....and since most fuel pumps that I am familiar with are cooled by the fuel ----- no fuel, no cooling.
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akellym |
May 11 2007, 05:26 PM
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#10
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Eyes Of The Deep Battle Group: Members Posts: 597 Joined: 25-July 04 From: Annandale, MN Member No.: 2,395 Region Association: Northstar Region |
The photo doesn't show it, but the pump is in the front trunk about 1" off the bottom.
This problem is recent. |
So.Cal.914 |
May 11 2007, 05:47 PM
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#11
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"...And it has a front trunk too." Group: Members Posts: 6,588 Joined: 15-February 04 From: Low Desert, CA./ Hills of N.J. Member No.: 1,658 Region Association: None |
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akellym |
May 11 2007, 06:30 PM
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#12
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Eyes Of The Deep Battle Group: Members Posts: 597 Joined: 25-July 04 From: Annandale, MN Member No.: 2,395 Region Association: Northstar Region |
3/8 and the stainless braided hose is -6 which I think is a little bigger than 3/8(not sure).
I just ran it 20 miles(hard) stop at around 10miles check the pump seemed normal as far as heat goes. Got back and it seem about the same. If it's not raining tomorrow I'm going puts some miles on and see how it does. My concern is if it run at normal temps on the hwy, what will happen if I were stuck in traffic? These are the things I have done to try and correct the promblem. 1. new pump and made sure all fuel filters were clean-didn't help 2. new volt reg-didn't help(I'm showing an increase in volts from 13.2 to 14.5) 3. new fuel relay-didn't help 4. cleaned all grounds-didn't help 5. ran new ground direct-didn't help 6. checked fuel flow and carbs |
Aaron Cox |
May 11 2007, 06:38 PM
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#13
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Professional Lawn Dart Group: Retired Admin Posts: 24,541 Joined: 1-February 03 From: OC Member No.: 219 Region Association: Southern California |
-6 means 6/16" or 3/8" (IMG:style_emoticons/default/smile.gif)
just for what its worth (IMG:style_emoticons/default/smile.gif) |
TROJANMAN |
May 11 2007, 06:39 PM
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#14
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Looks nice in pictures......... Group: Members Posts: 5,268 Joined: 5-March 04 From: Colorado Member No.: 1,753 Region Association: None |
good luck
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Aaron Cox |
May 11 2007, 06:39 PM
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#15
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Professional Lawn Dart Group: Retired Admin Posts: 24,541 Joined: 1-February 03 From: OC Member No.: 219 Region Association: Southern California |
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TROJANMAN |
May 11 2007, 06:49 PM
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#16
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Looks nice in pictures......... Group: Members Posts: 5,268 Joined: 5-March 04 From: Colorado Member No.: 1,753 Region Association: None |
you're quicker than i am. i edited that when i realized my mistake, and before your last post (IMG:style_emoticons/default/tongue.gif)
you must have quoted me during my edit. and given the fact both of our posts have the same time stamp, i'd say your pretty damn quick (IMG:style_emoticons/default/laugh.gif) |
Katmanken |
May 11 2007, 07:07 PM
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#17
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You haven't seen me if anybody asks... Group: Members Posts: 4,738 Joined: 14-June 03 From: USA Member No.: 819 Region Association: Upper MidWest |
Heat means more work than expected, more DC power supplied than expected, too small of a power line, or a failing motor.
Gotta load of crap gas? I had a Vanagon take on about 3/4 of an inch of crud in the bottom of the gas tank in one fillup. Pump motor heated up and whined due to excess work pulling through the filter. Took over 45 mins at the car wash to finally blow out all of the crap. That was when our ever faithful oil companies knew they had screwed up the gas mix so it would ruin the fuel tank sensors and shipped it anyway. Can you rig up a bypass and pump the the gas right back into the tank filler without heating up the pump? If you can, the problem is between the pump and the carbs. Ken |
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