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post #1 of (permalink) Old 02-13-2000, 07:10 PM Thread Starter
 
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Fuel filter in carbuerator...

I was wondering if anyone has put an inline fuel filter before the fuel pump. I hate the one that goes in the carbuerator... I don't want to mess with trying to remove the metal fuel line and filter holder thingee... The original person who had the truck started stripping the little nut on the fuel line, and every filter change it got worse and worse, I don't like making new hard lines, so I figure after I get it back in there without a filter this time, I'll just put one in the rubber line before the mechanical fuel pump... Anyone see any problems with this?

Tim
"The_Sandman_454"

[img]/wwwthreads_images/icons/cool.gif[/img] '79 Suburban 4x4 454, 6" lift, 35x12.5s & '85 GMC S15 4x4
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post #2 of (permalink) Old 02-13-2000, 07:59 PM
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Re: Fuel filter in carbuerator...

problem,no problem at all. In fact it works great. I had that same setup on my
toyota. I just cut the fuel line by the fire wall and using hose clamps put in
a inline filter w/metal ends and a clear glass tube so I could see the filter
element(fine mesh sceen).I believe it was a puralator from Discount A.P.for about
15bucks, they also had replacement elements(always had 3-4 in the glove box
If the truck started running like crap I just popped the hood and at a glance knew
if that was my prob. Because the body was made of glass I put a 4" piece of 1" hose
over it for protection from rock and such.anyway I liked it




HAWG WILD
<font color=red> ALL THOSE WHO WANDER ARE NOT NECESSARLY LOST </font color=red> [img]/wwwthreads_images/icons/cool.gif[/img]
post #3 of (permalink) Old 02-14-2000, 12:34 PM
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Re: Fuel filter in carbuerator...

I've heard of people putting as many as three fuel filters along the fuel line (both before and after the gas pump). This was to remedy rusty gas tank problems, though, but it seemed to work fine. Point being, yes filters can go before the fuel pump. Also, I don't think the fuel is pressurized before the mechanical pump, so you might need to put in a filter similar to those used for non-fuel-injected carbs. I'm not sure on this though, so check. Also, one possible problem would be if your pump ever wore out and started pumping worn out pieces through the fuel lines, there would be nothing to stop the shrapnel from going into the carb. Just my 2 cents.

[img]/wwwthreads_images/icons/cool.gif[/img] Steven Fairchild [img]/wwwthreads_images/icons/cool.gif[/img]
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post #4 of (permalink) Old 02-14-2000, 01:26 PM
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Re: Fuel filter in carbuerator...

I got a new replacement gas tank for about $70 if you are having rust troubles. They tend to leak around the seams after 15 years anyways.

post #5 of (permalink) Old 02-14-2000, 01:38 PM Thread Starter
 
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Re: Fuel filter in carbuerator...

Hmmmm.. I'm not sure what the problem is, I'm about positive it's not rust.. I just wanted something so I don't have to mess with the fittings on the carb because I don't feel like messin' with replacing it... [img]/wwwthreads_images/icons/crazy.gif[/img] It's a new pump, so I think it should be ok, for a while at least... I'm thinking I'm going to try and find a way to put it after the fuel pump though... Thanks for the suggestions...

Tim
"The_Sandman_454"

[img]/wwwthreads_images/icons/cool.gif[/img] '79 Suburban 4x4 454, 6" lift, 35x12.5s & '85 GMC S15 4x4
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post #6 of (permalink) Old 02-14-2000, 06:16 PM
 
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Re: Fuel filter in carbuerator...

Hey Tim,
Are you speaking about the 454 or the 2.8? I don't think the mechanical pump in the 2.8 can't develop sufficient suction pressure with a restrictive inline filter on the suction side.

I know that auto parts stores carry kits to repair the bad threads for the fuel inlet nut/ carburetor.

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post #7 of (permalink) Old 02-14-2000, 08:03 PM
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Re: Fuel filter in carbuerator...

just another thought(man it hurts when I do that) the first
thing most 1/4mile guys do is go to an inline because
the one in the carb is real restrictive. A lot of play'n in
the sand will crud up a filter fast(thats why I did it), sand
dust gets in place you can't even imagine. I just like the
clear one cause you can do a visual and there next to no
restriction(while clean)because it uses mesh not a paper
element.

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post #8 of (permalink) Old 02-14-2000, 10:22 PM Thread Starter
 
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Re: Fuel filter in carbuerator...

That's a good point about it in the suction side... I'm probably going to put it in the discharge from the pump... (yeah, this is on the 2.8L, I have an electric pump on the 454, and a filter up near the motor, and one before or after the pump, can't remember which, I think the suction side, but not totally sure on that)... I'll probably get a clear filter thingee so I can see what kind of condition it is in.. The one I took out of the carb was pretty full of gunk and other funky words.. [img]/wwwthreads_images/icons/wink.gif[/img] I have a spare hard line for it, but it's going to be a pain to take it out of the parts truck and throw it in, but I probably will... I'm also considering re-routing the fuel line, perhaps a bit, but not sure on that... I'm going to re-do it anyway, in the warm weather when project "Anti-Fed" (in which the 50% that hasn't been removed by previous owner gets removed) gets worked on... [img]/wwwthreads_images/icons/crazy.gif[/img]

Tim
"The_Sandman_454"

[img]/wwwthreads_images/icons/cool.gif[/img] '79 Suburban 4x4 454, 6" lift, 35x12.5s & '85 GMC S15 4x4
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post #9 of (permalink) Old 02-15-2000, 06:55 AM
 
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Re: Fuel filter in carbuerator...

Tim,
I reread your original post and I'm guessing that that previous owner used pliers or something similar to remove the nut and rounded off the flats. I thought you were talking about the fine threads in the carb housing itself.

There isn't much you can do about that, short of replacing the nut and tubing like you said. The mechanical pump should be able to push fuel thru the in line in the discharge line ok though. Good Luck!![img]/wwwthreads_images/icons/smile.gif[/img]

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post #10 of (permalink) Old 02-15-2000, 12:51 PM
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Re: Fuel filter in carbuerator...

$.02
Placing a filter before the pump can (not will) cause vapor lock because of the fact that the larger volume of the filter WILL cause a pressure drop(P=V*T). Generally only a problem in summer and/or at altitude.
If there is garbage from the tank, best to clean/replace.
Dan

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