Fuel pump relay.... hard cold start?
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Car: 1985 WS6 Lear-Siegler Leather Black
Engine: 305 TPI
Transmission: 700R4
Fuel pump relay.... hard cold start?
I did some mods on my 85' T/A WS6 now having cold start issues. It cranks and cranks on "cold start" before actually starting. When it is "warm, starts right up. When I turn Key to "AC" position, I do not hear the fuel pump. I do hear it for a few seconds after shutting car off (I think that's what I am hearing). Could it be pump relay? Where is it? How do I test that? and or replace it? Other issues? Vacuum somewhere? Seems as if my fuel lines are losing their PRIME after sitting for a bit and I need to wait for fuel.
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Car: 91 Z28
Engine: Enhanced 5.0L
Transmission: 700R4
Axle/Gears: 3:42 Posi
Re: Fuel pump relay.... hard cold start?
had similar cold start issues..was my fuel pump...pulled my relay, wouldnt start at all..put relay back in..after 3 or more attempts,would start...checked my pressure at rail..it was 20psi...regulator was ok...leaving me with fuel pump...once changed, cranks on first start..youtube how to check fuel pressure..i'll look for link..
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Car: 1985 WS6 Lear-Siegler Leather Black
Engine: 305 TPI
Transmission: 700R4
Re: Fuel pump relay.... hard cold start?
There is definately no pump running when I turn the key "ON" but not to start. I thought I read somewhere that by cranking the engine... getting the oil pressure up actually activates another circuit that runs the pump??? I can hear the pump run for a couple seconds as I turn the car off.
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Car: 1985 WS6 Lear-Siegler Leather Black
Engine: 305 TPI
Transmission: 700R4
Re: Fuel pump relay.... hard cold start?
I read a few earlier post on this subject... I did find the 20 AMP in line fuse near the battery, it was good. I did run a 12 volt "Jumper" from the battery to the "G" diagnostic port. The fuel pump did kick in. I did check the fuse block for the fuel pump fuse. There was no fuse in that slot, I tried to put a fuse in there, but it fell out. I pulled the block and found that there were no terminals or even wires going to that spot in the block. Assume my application must be different and not running from/fused from there? I then went to my Relay.... It's a single, 5 pin, not 3 separate like zero13 posted in the picture. Mine is a 85' TPI Pontiac T/A. Relay had silicone around it? maybegot wet prior to me owning... I ordered a new one, we will see what happens, be in later today.
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Car: 1985 WS6 Lear-Siegler Leather Black
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Re: Fuel pump relay.... hard cold start?
New Fuel Pump Relay installed..... Fixed! Thanks for everyones help on this post and just the ability to search the forums is a great asset to track down and fix problems.
#9
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Car: 1987 Iroc Z28 Camaro
Engine: 5.7 TPI
Transmission: 700R4
Re: Fuel pump relay.... hard cold start?
Could you do me a huge favor and, take a picture of where you found the in line fuse near the battery. And, also of the relay you've replaced. I've done my pump, filter, and,still no luck. It turns over every once in a while but, will die after running randomly and, without warning. I don't think it to be a fuse because of the fact that it is intermittent but, there could be a bad connection at that fuse. I just can't seem to locate it.
Thanx in advance.
Thanx in advance.
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Car: 1985 WS6 Lear-Siegler Leather Black
Engine: 305 TPI
Transmission: 700R4
Re: Fuel pump relay.... hard cold start?
Could you do me a huge favor and, take a picture of where you found the in line fuse near the battery. And, also of the relay you've replaced. I've done my pump, filter, and,still no luck. It turns over every once in a while but, will die after running randomly and, without warning. I don't think it to be a fuse because of the fact that it is intermittent but, there could be a bad connection at that fuse. I just can't seem to locate it.
Thanx in advance.
Thanx in advance.
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Car: 1987 Iroc Z28 Camaro
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Re: Fuel pump relay.... hard cold start?
thank you for the speedy reply.
I have three black boxes right in the same place on the drivers firewall. I'm pretty sure I'm looking at the right one. I think one is the fuel pump relay, one is the map and, the other is the second fan relay. I'll know once I see the replacement. Still having a hard time finding the fuse though. I've got a fan relay on the passenger side radiator support. I'll dig a little more once the sun comes back up.
I have three black boxes right in the same place on the drivers firewall. I'm pretty sure I'm looking at the right one. I think one is the fuel pump relay, one is the map and, the other is the second fan relay. I'll know once I see the replacement. Still having a hard time finding the fuse though. I've got a fan relay on the passenger side radiator support. I'll dig a little more once the sun comes back up.
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Car: 1985 WS6 Lear-Siegler Leather Black
Engine: 305 TPI
Transmission: 700R4
Re: Fuel pump relay.... hard cold start?
thank you for the speedy reply.
I have three black boxes right in the same place on the drivers firewall. I'm pretty sure I'm looking at the right one. I think one is the fuel pump relay, one is the map and, the other is the second fan relay. I'll know once I see the replacement. Still having a hard time finding the fuse though. I've got a fan relay on the passenger side radiator support. I'll dig a little more once the sun comes back up.
I have three black boxes right in the same place on the drivers firewall. I'm pretty sure I'm looking at the right one. I think one is the fuel pump relay, one is the map and, the other is the second fan relay. I'll know once I see the replacement. Still having a hard time finding the fuse though. I've got a fan relay on the passenger side radiator support. I'll dig a little more once the sun comes back up.
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Car: 1991 Z28
Engine: 305 TPI
Transmission: 700R4
Axle/Gears: 3:42 Auburn
Re: Fuel pump relay.... hard cold start?
Where did you order the relay from. I have the same excact issue and I notice that the ground wire had been cut and a half butted attempt made to reconnect it. I fixed that and I can here my pump running but it seems like sometimes it runs for 3 or so seconds and others about 1 second. I just want to replace the relay also.
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Car: 1985 WS6 Lear-Siegler Leather Black
Engine: 305 TPI
Transmission: 700R4
Re: Fuel pump relay.... hard cold start?
Where did you order the relay from. I have the same excact issue and I notice that the ground wire had been cut and a half butted attempt made to reconnect it. I fixed that and I can here my pump running but it seems like sometimes it runs for 3 or so seconds and others about 1 second. I just want to replace the relay also.
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Car: 91 Z28
Engine: Enhanced 5.0L
Transmission: 700R4
Axle/Gears: 3:42 Posi
#17
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Car: 91 Z28
Engine: Enhanced 5.0L
Transmission: 700R4
Axle/Gears: 3:42 Posi
Re: Fuel pump relay.... hard cold start?
see the cables between battery and coolant bottle?..thats the in line fuse for fuel pump(20A) in the flip top sealed cap.....this is a 91 tpi.
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