No fuel
Thread Starter
Racer
Joined: Dec 2010
Posts: 302
Likes: 0
From: delancey new york
No fuel
I started this thread under a different topic under general with not much responce (1)-----I took my battery out to clean that area. Put everything together now i have a no start.Turns over fine everything seems to work but the pump NO FUEL, it seems now the fuel pump is not running (no fuel to rail) I checked the book and it said to jump the pump relay ,but there is no power to the relay. (with key on) What can i check next ?? ------------ The wire cluster behind the battery MAF wires (fuseable links)do any of them send power to the fuel system??? The only thing i did was clean the battery compartment. I'm new at this---87C4 I really hate it when you do a good thing and it turns sour
Thread Starter
Racer
Joined: Dec 2010
Posts: 302
Likes: 0
From: delancey new york
Burning Brakes
Joined: May 2011
Posts: 838
Likes: 2
From: Louisville Ky
should be #24, last btm rt; also another in auxiliary fuses, #1, secondry fuel pump, but I am not sure what the hell that is. they are very hard to get to so I would chk everything else first. if you have to chk, you will need a 7mm socket, also one screw to the kickpanel is inside the main fuse box, if that is inside door on pass side like my 91. joe
Burning Brakes
Joined: May 2011
Posts: 838
Likes: 2
From: Louisville Ky
I started this thread under a different topic under general with not much responce (1)-----I took my battery out to clean that area. Put everything together now i have a no start.Turns over fine everything seems to work but the pump NO FUEL, it seems now the fuel pump is not running (no fuel to rail) I checked the book and it said to jump the pump relay ,but there is no power to the relay. (with key on) What can i check next ?? ------------ The wire cluster behind the battery MAF wires (fuseable links)do any of them send power to the fuel system??? The only thing i did was clean the battery compartment. I'm new at this---87C4 I really hate it when you do a good thing and it turns sour
dumb question: turn the key to on, no start, and you normally hear the pump runnng to build pressure, 2-3 secs. might hear the relay which is on the firewall, I believe.
Burning Brakes
Joined: May 2011
Posts: 838
Likes: 2
From: Louisville Ky
another thought...were you cleaning, pulling wires behind the distributor by chance, oil sending unit, perhaps? think it is down in the location, and if it is not connected, the ecm does not see the signal of 4 lbs pressure and fuel pump does not run. may be not totally correct, but read thatt on a topic once.
there a lot of savvy people here, someone will respond. maybe eating dinner. (he hee)
there a lot of savvy people here, someone will respond. maybe eating dinner. (he hee)
Thread Starter
Racer
Joined: Dec 2010
Posts: 302
Likes: 0
From: delancey new york
another thought...were you cleaning, pulling wires behind the distributor by chance, oil sending unit, perhaps? think it is down in the location, and if it is not connected, the ecm does not see the signal of 4 lbs pressure and fuel pump does not run. may be not totally correct, but read thatt on a topic once.
there a lot of savvy people here, someone will respond. maybe eating dinner. (he hee)
there a lot of savvy people here, someone will respond. maybe eating dinner. (he hee)
Last edited by ken1950; Jun 24, 2011 at 09:27 PM.
Instructor
Joined: Jun 2011
Posts: 182
Likes: 0
From: Bowling Green Ky
I started this thread under a different topic under general with not much responce (1)-----I took my battery out to clean that area. Put everything together now i have a no start.Turns over fine everything seems to work but the pump NO FUEL, it seems now the fuel pump is not running (no fuel to rail) I checked the book and it said to jump the pump relay ,but there is no power to the relay. (with key on) What can i check next ?? ------------ The wire cluster behind the battery MAF wires (fuseable links)do any of them send power to the fuel system??? The only thing i did was clean the battery compartment. I'm new at this---87C4 I really hate it when you do a good thing and it turns sour
jc
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Thread Starter
Racer
Joined: Dec 2010
Posts: 302
Likes: 0
From: delancey new york
I didn't know that there was current to the relay for just a couple seconds.I assumed there was voltage when key was on (never assume-new lesson) When i checked it the key had been on for a couple minutes. I'll have to re-check--THANKS fo the LESSON--tuff doing this checking by your self--My brain has been out of gear for the last 62yrs.--i've always had HD's---this is first vette---Sold my bike to buy this car
Instructor
Joined: Jun 2011
Posts: 182
Likes: 0
From: Bowling Green Ky
one cavet here: I am old school mechanic, not real familiar with ecm/ccm stuff. from my own fuel issues, and what I picked up, the ecm shuts off pump until engine is cranking and above 4 lbs oil pres.
stupid question: have you verifed no presure at the rails? should have been enough left there to run the engine for couplel minutes with fuse removed, as if draining it to replace filter...
also, have not located my relay, but any relay with red wire is always hot AT THAT TERMINAL. the others are switched in, like the horn, etc.
have just recently been discovering how to work on my old 91. I am posting because no one else is, for whatever reasons.
stupid question: have you verifed no presure at the rails? should have been enough left there to run the engine for couplel minutes with fuse removed, as if draining it to replace filter...
also, have not located my relay, but any relay with red wire is always hot AT THAT TERMINAL. the others are switched in, like the horn, etc.
have just recently been discovering how to work on my old 91. I am posting because no one else is, for whatever reasons.
Thread Starter
Racer
Joined: Dec 2010
Posts: 302
Likes: 0
From: delancey new york
one cavet here: I am old school mechanic, not real familiar with ecm/ccm stuff. from my own fuel issues, and what I picked up, the ecm shuts off pump until engine is cranking and above 4 lbs oil pres.
stupid question: have you verifed no presure at the rails? should have been enough left there to run the engine for couplel minutes with fuse removed, as if draining it to replace filter...
also, have not located my relay, but any relay with red wire is always hot AT THAT TERMINAL. the others are switched in, like the horn, etc.
have just recently been discovering how to work on my old 91. I am posting because no one else is, for whatever reasons.
stupid question: have you verifed no presure at the rails? should have been enough left there to run the engine for couplel minutes with fuse removed, as if draining it to replace filter...
also, have not located my relay, but any relay with red wire is always hot AT THAT TERMINAL. the others are switched in, like the horn, etc.
have just recently been discovering how to work on my old 91. I am posting because no one else is, for whatever reasons.
Instructor
Joined: Jun 2011
Posts: 182
Likes: 0
From: Bowling Green Ky
ken, for first time I tried to verify the 2 sec pump on and the continuity light was on 1-2 seconds, key in "ON" then light was off. same thing every time I turned key. so...
start your description of the root issue as, -won't start, turns, won't fire, whatever, rather than no voltage to pump, IF you find that your light comes on, IF you are in the right fuse circuit.
my guess is that relay is not the issue.
start your description of the root issue as, -won't start, turns, won't fire, whatever, rather than no voltage to pump, IF you find that your light comes on, IF you are in the right fuse circuit.
my guess is that relay is not the issue.
Thread Starter
Racer
Joined: Dec 2010
Posts: 302
Likes: 0
From: delancey new york
Thread Starter
Racer
Joined: Dec 2010
Posts: 302
Likes: 0
From: delancey new york
ken, for first time I tried to verify the 2 sec pump on and the continuity light was on 1-2 seconds, key in "ON" then light was off. same thing every time I turned key. so...
start your description of the root issue as, -won't start, turns, won't fire, whatever, rather than no voltage to pump, IF you find that your light comes on, IF you are in the right fuse circuit.
my guess is that relay is not the issue.
start your description of the root issue as, -won't start, turns, won't fire, whatever, rather than no voltage to pump, IF you find that your light comes on, IF you are in the right fuse circuit.
my guess is that relay is not the issue.
Thread Starter
Racer
Joined: Dec 2010
Posts: 302
Likes: 0
From: delancey new york
Just did a check---put 12volts to terminal (G) on the ALCL and the pump runs---and have fuel pressure at the rail after check, but pump doesn't run unless it is energized by the (G) term.
Last edited by ken1950; Jun 25, 2011 at 12:51 PM.
Instructor
Joined: Jun 2011
Posts: 182
Likes: 0
From: Bowling Green Ky
so, again, did you verify light-no loght at fuse terminals when key is turned on? are you in the fuse circuit? if you don't have the users manual you are shooting in the dark. don't ignore teh seondary fuse, assuming you have one on the 87.
IF you cycle pump on, I think the relay is working, not sure if the aldl goes thru fuses.
if pump runs, fuel should be under pressure at the rail. again...in your words, what is the issue? no start of course, but no fuel, too? answer those questions, pls. you have to check it somehow, gage or loosen a hose, whatever.
Instructor
Joined: Jun 2011
Posts: 182
Likes: 0
From: Bowling Green Ky
aldl prob does not go thru fuse because it is used to diagmose on the assembly line, no fuses are in yet. I reckon. I confirmed my pump comes on at G with fuse removed.
the one thing you may have confirmed is the pump has voltage. until you confirm that your fuse holder had voltage or not, progress stops.
regards, jc
the one thing you may have confirmed is the pump has voltage. until you confirm that your fuse holder had voltage or not, progress stops.
regards, jc
Thread Starter
Racer
Joined: Dec 2010
Posts: 302
Likes: 0
From: delancey new york
slow progress beats a blank.
so, again, did you verify light-no loght at fuse terminals when key is turned on? are you in the fuse circuit? if you don't have the users manual you are shooting in the dark. don't ignore teh seondary fuse, assuming you have one on the 87.
IF you cycle pump on, I think the relay is working, not sure if the aldl goes thru fuses.
if pump runs, fuel should be under pressure at the rail. again...in your words, what is the issue? no start of course, but no fuel, too? answer those questions, pls. you have to check it somehow, gage or loosen a hose, whatever.
so, again, did you verify light-no loght at fuse terminals when key is turned on? are you in the fuse circuit? if you don't have the users manual you are shooting in the dark. don't ignore teh seondary fuse, assuming you have one on the 87.
IF you cycle pump on, I think the relay is working, not sure if the aldl goes thru fuses.
if pump runs, fuel should be under pressure at the rail. again...in your words, what is the issue? no start of course, but no fuel, too? answer those questions, pls. you have to check it somehow, gage or loosen a hose, whatever.
Last edited by ken1950; Jun 25, 2011 at 02:27 PM.
Instructor
Joined: Jun 2011
Posts: 182
Likes: 0
From: Bowling Green Ky
After puting the voltage to the ALCL (G) and let fuel pressure rise to rail the car will run until that fuel is used up.The pump will not run without voltage to the ALCL(G) term.Without putting the jumper to (G) I turn the key on and no fuel pump sound and no fuel at rail. Energize The (G) and let pressure build and it will start.Remember i've only worked on motorcycles and this is my Vette--Shooting in the dark-yes i am. But i'm learning alot on this forum. So have patients mine is wearing very thin at the moment . Have to do this stuff myself No decent mech. for a 100mi. round trip. You sent your message while i was writing the above--I'll go out now and confirm voltage at the fuse holder
progress is: we know the pump runs , thtu the alternate test line.
we/you need to verify, somehow, where your fuses are and IF you have the additional fuses blocks and which one is "FP 2."
ECM does not shut down FP fuses, other than as we know, 2 secs. so a fuse, relay, whatever is out of circuit. I reckon.
lighten up (hee hee!)