Injector spider question

Injector spider question

Postby Nitetimes [OP] » December 27th 2010, 5:13am

Swapping out 4.3, straight swap 4.3 to 4.3 but the fuel lines on the spiders were different, the original had a return line the replacement motor had a steel plug where the return line would be. Is there a diffidence in the unit as far as return/no return? I need to know because the van doesn't want to stay running. It will start and doesn't seem to miss while it's running but it won't run for more than 10-15 seconds then sounds like it's running out of gas (plenty in the tank). About the only thing I didn't swap on the motors was the plenum and the intake/injectors, was hoping to use the 30k mile ones as opposed to the 180k mile ones. We can't find anything else that should be causing this so it seems to be that the no return injector unit has to be causing the problem???
Anyone know for certain if there is a difference or not? If not we need to start looking elsewhere for the solution, Any help would be appreciated...thanks, R
Original Poster [OP]
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Re: Injector spider question

Postby Gary » December 27th 2010, 5:46am

Could you tell us what yr is the engine you put in and what it came from??.
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Re: Injector spider question

Postby Phantom » December 27th 2010, 5:48am

There are various configurations of the 4.3 depending on what year and VIN you have , the first place I would look is at exactly what versions you have , we can probably get you a diagram , but not knowing what the 2 configurations you have; would not know what way to direct you ,
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Re: Injector spider question

Postby Nitetimes [OP] » December 27th 2010, 5:56am

Gary wrote:Could you tell us what yr is the engine you put in and what it came from??.


Nope and nope.....came from a junkyard.
The van is an 04 AWD
No codes came up but it didn't really run long
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Re: Injector spider question

Postby Gary » December 27th 2010, 6:08am

Take the casting number off the back of the engine.
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Re: Injector spider question

Postby Nitetimes [OP] » December 27th 2010, 4:23pm

Gary wrote:Take the casting number off the back of the engine.


Don't know how much these help but..........

Old motor: GM 4.3LG ... 14099090 ........ D134 .........14
New motor:GM 4.3LG ... 14099090 ........G215 .........14

Edit to add; VIN from van ..... 1GCDL19X84B130729

I'm beginning to believe I either need to change the injector top unit but I just don't see why there would be any difference in them as far as the fuel inlet/outlet ports, or the entire injector spider.
Can anyone tell me how they can run an injected motor with no fuel return line? That kinda has me a bit perplexed? Haven't seen a motor with no return for quite a while. What happens to the excess fuel from the pump at idle? lower volume seems to be the answer but then what happens when you get on it? Smart fuel pump??
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Re: Injector spider question

Postby Nitetimes [OP] » December 27th 2010, 4:33pm

I'd really like to get this thing out of here today so any help/ideas you could give would be greatly appreciate!!!! :) :) :) :ty:
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Re: Injector spider question

Postby Phantom » December 27th 2010, 5:48pm

Well it seems that the casting number . 14099090 is the same block casting number through many years , not sure what those other number are , more research is needed on that , maybe they are date codes , if you research how GM used date codes it may help decode them , The "X" on a 2004 is the system you have on the old motor
, you may have a "W" engine which is slightly different injection system , maybe you can swap the injection spider from the Old engine onto the new engine , or maybe you can ask the place you got the old engine from what year it is and what it came out of ,
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Re: Injector spider question

Postby Nitetimes [OP] » December 27th 2010, 7:26pm

Phantom wrote:maybe you can swap the injection spider from the Old engine onto the new engine ,


Really hoping to avoid using any more parts than necessary from a 180k motor on a 30k motor but I will if I have to
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Re: Injector spider question

Postby doyoulikeithere » December 28th 2010, 2:35am

maybe a stupid question....
Can you pull out the steel plug, and put in the fuel return??
:twisted:
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Re: Injector spider question

Postby Nitetimes [OP] » December 28th 2010, 3:23am

doyoulikeithere wrote:maybe a stupid question....
Can you pull out the steel plug, and put in the fuel return??


Exactly what I did do. But the more research I do the more likely it seems that it won't work with the 'new' spider. While playing with it today we believe it may be trying to hydro lock, which leads me to believe that whatever year the 'new' one is it won't work with the 2 line (in/out) return system. It seems the return on the single line system is near the tank, with the excess fuel returning back there rather than going thru the injection unit.
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