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Unread 04-21-2013, 05:48 PM   #1
ijusgottajeep
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1994 ZJ 
 
Join Date: Apr 2013
Location: Naples, Idaho
Posts: 8
questions regarding the swampy bypass

so i want to do the bypass setup on my jeep since i bought it with fuel pump power issues. but i don't know if it will affect the PCM/ECU/ whatever if i wire it up on it's own circuit. basically, the original pump gets no power and the relay and the fuse have been switched out but to no prevail. rather than diving deeper into this issue i want to just do the swap to an inline pump and run a wire basically straight from the battery to a switch on the dash with an inline fuse than to the pump. yes it doesn't sound like the greatest idea i do know that but i'm a low income tree farmer with a kid a month and a half away and i can't put a car seat in my big old pickup. can I do this and not have my ECM burn up? i hot wired the original pump and got it to pump fuel for a minute so i could start it and it did start for a minute, but the pump quit pumping. so here I am asking you jeep guys because i'm new to the jeep thing and i need answers from guys who know what the heck they're talking about

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Unread 04-22-2013, 12:24 AM   #2
zachjf
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1998 ZJ 
 
Join Date: Jun 2008
Location: Portland, Oregon
Posts: 1,067
Its most likely the caps in your ECM causing your no start issue and its a common, easy to fix problem, did it myself on a friends 95 GC in under an hr iirc. I'd try replacing the caps first as its dirt cheap, quick and super easy if you have a Radio Shack near you.

Check out this thread;
http://www.jeepforum.com/forum/f13/f...riteup-501951/

And this one;
http://www.jeepforum.com/forum/f13/b...m-help-330109/

And this one;
http://www.jeepforum.com/forum/f13/l...nt-how-501574/
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Unread 04-24-2013, 06:57 PM   #3
ijusgottajeep
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1994 ZJ 
 
Join Date: Apr 2013
Location: Naples, Idaho
Posts: 8
wow yes that sounds a little more reasonably priced than what i was looking to do. i'll give it a shot this weekend my brother in law is very familiar with these tasks, more so than I. side note i'm also from portland originally. i grew up in st johns lol. thanks for the help you potentially saved me around 100 bucks or more!
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Unread 04-24-2013, 10:30 PM   #4
zachjf
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1998 ZJ 
 
Join Date: Jun 2008
Location: Portland, Oregon
Posts: 1,067
I read through the bypass thread and noticed in the last post that one person had an issue with the fuel pump being too big and putting over double the fuel pressure to the engine and fouling plugs after a very short amount of time. Stock fuel pressure is around 43psi, iirc, so 100 is way too much, you'd need to find a lower psi in line pump if you attempted the bypass mod.

St Johns is a cool area, be nice if they could out the bad elements and turn it into one of those trendy pockets that have sprung up all over ne and se
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Unread 05-01-2013, 03:30 PM   #5
ijusgottajeep
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1994 ZJ 
 
Join Date: Apr 2013
Location: Naples, Idaho
Posts: 8
oh yes it would be nice. but the pump i found on summitracing was 45 psi and i cannot remember how many GPH. it was only 80 bucks though. might want to keep that in the back of your mind if you ever do it. so if my problem isn't the caps in the ecu, what else could it possibly be? i'm pulling the unit now to have my brother in law test it with his meter to double check.
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Unread 05-01-2013, 05:36 PM   #6
ijusgottajeep
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1994 ZJ 
 
Join Date: Apr 2013
Location: Naples, Idaho
Posts: 8
check this out i found the right caps for cheaper http://www.parts-express.com/pe/show...umber=020-1746
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