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Author Topic: Electric fuel pump  (Read 7377 times)

timatoe

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Re: Electric fuel pump
« Reply #20 on: July 11, 2017, 01:11:28 PM »

Good News!!  Bad News!!

Good news is, I cut the harness open, pulled the old tach filter out and put the new one in and it fired right up.

Bad news is, I taped everything back together on the harness put the ECM back in place, started getting everything buttoned up and thought..... I should check again before I get everything back together.  Turned the key, it fired for a second and wouldn't start.  Now I'm right back to the exact same issue.  Something in there is blowing that little tach filter circuit.  Called Howell and the tech guy is busy, will try back in a half hour.
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Mr.B

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Re: Electric fuel pump
« Reply #21 on: July 11, 2017, 01:29:43 PM »

Can you take a picture of it? Is it just a capacitor or something?
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White '94 YJ 2.5L 5 speed, 35" BFGs KM2's, 5" lift, Mark VII 2 speed fan, Milemarker PE8000, Front Aussie Locker, Power steering conversion, '98 Cavalier seats, MORE Boomerangs in front, 136 amp ZJ alternator, JB conversions SYE, Tom Woods custom drive shaft, 8.8 with ARB, 4.88 gear ratio, Teralow

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Mr.B

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Re: Electric fuel pump
« Reply #22 on: July 11, 2017, 01:33:18 PM »

You may have an open wire in the harness. Take all the tape off that you put on, and put everything back to where you had it to test.
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White '94 YJ 2.5L 5 speed, 35" BFGs KM2's, 5" lift, Mark VII 2 speed fan, Milemarker PE8000, Front Aussie Locker, Power steering conversion, '98 Cavalier seats, MORE Boomerangs in front, 136 amp ZJ alternator, JB conversions SYE, Tom Woods custom drive shaft, 8.8 with ARB, 4.88 gear ratio, Teralow

You're a super genius....
The difference between stupidity and genius is that genius has its limits. -Albert Einstein

timatoe

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Re: Electric fuel pump
« Reply #23 on: July 11, 2017, 02:54:31 PM »

Yeah, I did all that, still no worky.

Got a hold of Troy at Howell.  He said something is causing it to blow, the filter gets its input from the tach signal (on mine it's a HEI) he said if it blew two of them I'm most likely getting a voltage spike from the HEI module to the filter causing it to blow out.  I'm going to go try and get all that worked out and I'll have another filter overnighted tomorrow morning.  Best case at that point is late Thursday we'll roll out with the Jeep, worse case is late Thursday we'll roll out without the Jeep.
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timatoe

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Re: Electric fuel pump
« Reply #24 on: July 11, 2017, 05:30:19 PM »

Here's what the filter looks like out of the harnes....



The Howell kit is a fuel only kit (apparently that's a requirement for it to be CA legal) so no EST.  Set the timing and forget it.
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timatoe

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Re: Electric fuel pump
« Reply #25 on: July 11, 2017, 05:31:18 PM »

Yeah, so that's a micro pic when you click on the link.  I don't know how to actually link the pic using flickr.
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timatoe

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Re: Electric fuel pump
« Reply #26 on: July 11, 2017, 05:31:57 PM »

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timatoe

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Re: Electric fuel pump
« Reply #27 on: July 11, 2017, 05:32:15 PM »

Still micro pics
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timatoe

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Re: Electric fuel pump
« Reply #28 on: July 11, 2017, 08:36:17 PM »

So just unplug the actual injector, turn it over then try the other?  Of course, I was about to go out and try that real quick, but I already cut the other tach filter out of the harness.
« Last Edit: July 11, 2017, 08:44:50 PM by timatoe »
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timatoe

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Re: Electric fuel pump
« Reply #29 on: July 11, 2017, 10:04:07 PM »

I was just thinking about the shorted injector thing.  It would seem they still wouldn't work even with the new tach filter in place if that was happening.  The both were spraying fuel fine when it did start this morning.
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Mr.B

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Re: Electric fuel pump
« Reply #30 on: July 11, 2017, 10:24:07 PM »

I have no experience with your set up. But I would have to agree with you on that part. What would happen if you tried to temporarily bypass the tach filter?
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White '94 YJ 2.5L 5 speed, 35" BFGs KM2's, 5" lift, Mark VII 2 speed fan, Milemarker PE8000, Front Aussie Locker, Power steering conversion, '98 Cavalier seats, MORE Boomerangs in front, 136 amp ZJ alternator, JB conversions SYE, Tom Woods custom drive shaft, 8.8 with ARB, 4.88 gear ratio, Teralow

You're a super genius....
The difference between stupidity and genius is that genius has its limits. -Albert Einstein

Mr.B

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Re: Electric fuel pump
« Reply #31 on: July 12, 2017, 07:10:42 AM »

Doug, don't those brown components look like fuses?




When you see a bigger pic of the filter, you also read the IC part#. So I found this:

http://noel.feld.cvut.cz/hw/motorola/books/dl129/pdf/mc74hc14arev7.pdf

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White '94 YJ 2.5L 5 speed, 35" BFGs KM2's, 5" lift, Mark VII 2 speed fan, Milemarker PE8000, Front Aussie Locker, Power steering conversion, '98 Cavalier seats, MORE Boomerangs in front, 136 amp ZJ alternator, JB conversions SYE, Tom Woods custom drive shaft, 8.8 with ARB, 4.88 gear ratio, Teralow

You're a super genius....
The difference between stupidity and genius is that genius has its limits. -Albert Einstein

timatoe

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Re: Electric fuel pump
« Reply #32 on: July 12, 2017, 02:04:32 PM »

Yeah, I put another HEI module, condenser, cap and rotor in there last night.  Another tach filter will be here in the morning hopefully.
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timatoe

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Re: Electric fuel pump
« Reply #33 on: January 05, 2019, 07:58:41 AM »

So......

Got the axles back in after gearing and all that and drove it to Robert's house yesterday.  Ran fine there, ran fine back to town.  Walked out of the pharmacy and exactly the same thing happening, cranking but not firing.  I haven't had a chance to even look at it, it's actually still on my trailer in the driveway.  I'm going to run back through the same basic diagnosis as before.

I never wrapped up the original thread with, Troy at Howell said the HEI module can fail and cause a voltage spike (like Doug mentioned) and blow the tach filter.  If it tests out to be to the tach filter again I'll order another and ask if there's something I can do inline (fuse-ish) to prevent it again if the module goes bad.
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timatoe

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Re: Electric fuel pump
« Reply #34 on: January 06, 2019, 10:02:13 AM »

With the rain and my work schedule I haven't tested anything yet.  I'm thinking if it turns out to be another bad HEI module I may ditch the HEI, go back to the stock distributor and do the "Team Rush" mod on it. 
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Mr.B

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Re: Electric fuel pump
« Reply #35 on: January 06, 2019, 12:54:44 PM »

Those probably are fuses, but we talked about that before. But the real question is why are they blowing? You might be better off going back to the original dizzy.
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White '94 YJ 2.5L 5 speed, 35" BFGs KM2's, 5" lift, Mark VII 2 speed fan, Milemarker PE8000, Front Aussie Locker, Power steering conversion, '98 Cavalier seats, MORE Boomerangs in front, 136 amp ZJ alternator, JB conversions SYE, Tom Woods custom drive shaft, 8.8 with ARB, 4.88 gear ratio, Teralow

You're a super genius....
The difference between stupidity and genius is that genius has its limits. -Albert Einstein

andyinCopper

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Re: Electric fuel pump
« Reply #36 on: January 06, 2019, 09:05:56 PM »

Did you make sure to check the three fuses in the howell wiring harness under your dash? I had a problem with a loose wire causing me to randomly blow one of those fuses, and then it would turn over and not start. I now carry several extra fuses with me.
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timatoe

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Re: Electric fuel pump
« Reply #37 on: January 07, 2019, 04:11:37 PM »

I haven't checked anything yet this time due to weather and work.  The Jeep is actually sitting on my trailer in the driveway still hooked to the truck.

The first time it happened it turned out to be a bad HEI module that burned up the tach filter.  I'm having a feeling that it's the same thing again, I'm gonna ditch it if so.
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timatoe

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Re: Electric fuel pump
« Reply #38 on: January 10, 2019, 07:42:40 PM »

OK, so since this was my first day off and it's not raining.  I went to take the Jeep off the trailer and Robert suggested just seeing if it would start and low and behold it did.  I have no idea why it started or why it didn't start the other day.

All I know for sure is that day it smelled strongly of gas inside the cab (the fuel cell is in the back partially through the floor).  Sometimes it'll smell after a fill up but usually not after and it's currently between 1/2 and 3/4 full.  It doesn't smell like fuel in there today, so who knows.
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timatoe

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Re: Electric fuel pump
« Reply #39 on: January 11, 2019, 09:04:22 AM »

Any chance your ignition switch is flaky?

I have replaced it before, but it was turning over fine, I'd have to assume it would have fire if it turns over because of the way the HEI is wired.  But I could be wrong.
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