95 S10 Blazer help

Topic: 95 S10 Blazer help (Read 1146 times) previous topic - next topic

95 S10 Blazer help

December 31, 2006, 02:47:47 PM

1995 s10 4.3L vortec Blazer

Friend of mine has fuel going directly to the oil pan. I have a vortec engine near by and split open the intake. Chevy put the Single fuel injection/fpr inside there.

Mike ( my friend) wants to be able to observe the fuel to see if the line is broken inside the intake or if infact the "pop" assembly is broke. This engine does not have injectors,, just has one pop assembly that branches out in six directions.

I told him i would check around and see if any of you knows how to make the fuel pump run without running the engine. Kinda like what we do on the test conn by grounding out the green wire on the test conn then turning on the ign switch.

he wants to just run the pump to check and see if what he has been told to check for is a problem or not. CHevy molded some metal tubing entering the intake and up to the FPR but the welds sometimes crack.

leme know

Someone with access to a database on this stuff would be nice.

scott

95 S10 Blazer help

Reply #1 – December 31, 2006, 05:02:08 PM

Good ol' CPI :D Chances are the "poppets" in the lines going to each port are leaking. Sometimes this can be fixed with a can of fuel system cleaner (the kind that connects to the fuel line). Sometimes...

According to Michell OnDemand there is a fuel pump "prime" connector on the firewall, driver's side. It should have a red wire. Give it 12 volts and the pump should run.

95 S10 Blazer help

Reply #2 – December 31, 2006, 06:05:41 PM

Quote from: Thunder Chicken;120936

According to Michell OnDemand there is a fuel pump "prime" connector on the firewall, driver's side. It should have a red wire. Give it 12 volts and the pump should run.

thats perfect information. could you spoon feed it with a tiny bit more on the location of the conn,, or is this wire on a connnector with other wires,,,,, or is it a single wire conn in plain sight,,

sorry to be a pain, i can go and pop the hood on my neighbors blazer to confirm its location ect.

the guy im helping out is in Tenn. the blazer im using to look at is down the road.

thanks TC,,, i wish i had that subscription you have.
Ill do you up a car fax report in trade,,K?

95 S10 Blazer help

Reply #3 – December 31, 2006, 10:03:22 PM

It's not a subscription, it's a 6-DVD set :hick: As for the connector, Mitchell does not describe it except to call it the "fuel pump test connector", and the component locator says "rear of engine compartment, left side". It's been a good decade since I've been under the hood of a CPI truck, but IIRC it is indeed a simple connector with one red wire

95 S10 Blazer help

Reply #4 – January 01, 2007, 12:15:20 AM

thank you TC,, much appreciated. that narrows it down pretty well so now all i have to do is go and take a look under the hood of the one down the road before i spout off at the mouth to my friend down in tenn.

95 S10 Blazer help

Reply #5 – January 05, 2007, 05:23:19 PM

Yesterday i located the single wire conn you mentioned and its location was different ,,and,,, it did not work

The owner of the Blazer im looking at thinks that the lower left side of the test conn below the column happens to be the wire to apply power to.

I found a single wire daad center of the engine bay fire wall and i put a test light to ground on it. The lite came on and went off with the fuel pump. I then used the test light as my jumper to apply power to this single wire. NO PUMP sounds or relay.

you dont recon using the test light inline with the battery as my jumper prevented the pump from coming on do you? I thought it should still be like a jumper since the bulb completes the path.

I should have just found a straight wire.

95 S10 Blazer help

Reply #6 – January 05, 2007, 05:39:54 PM

No offense to anybody here, but I've heard nothing but bad things about the Blazer/Jimmy.

95 S10 Blazer help

Reply #7 – January 05, 2007, 05:49:49 PM

Quote from: jcassity;122078

you dont recon using the test light inline with the battery as my jumper prevented the pump from coming on do you? I thought it should still be like a jumper since the bulb completes the path.

I should have just found a straight wire.

Yeah you should use a straight wire. The test light puts too much resistance in series with the pump.

95 S10 Blazer help

Reply #8 – January 06, 2007, 01:05:30 AM

your probably right,, it was my gut feeling

95 S10 Blazer help

Reply #9 – January 06, 2007, 09:31:52 AM

Quote from: softtouch;122083

Yeah you should use a straight wire. The test light puts too much resistance in series with the pump.

Agreed - the pump would have a much lower resistance then the test light, so the test light would have a higher voltage drop in a series circuit, not leaving much voltage for the pump. A test light can be used to activate a relay, but not a heavy load. Just be sure you're probing the right wire before using a solid jumper - a test light can also be a "safety valve", not allowing too much current through (which brings us back to why it won't run a fuel pump)