fuel pump relay?

[destroyer1362]

As I mentioned earlier I got my fuel pump replaced recently. It turned out to be a dud and was replaced again. My misfire is gone now and my ses light is off. But my truck is still running funny. When I start it after it has been sitting for a while (over night) it cranks for about 7 seconds before it fires up. Also if I shut it off and immediately try to restart it it will crank for about 5 seconds before it will fire up. But if I kill it wait about 15 seconds and try to start it I will start up right away.

Before the fuel pump was replaced it would start right up after sitting over night. So does this sound like a relay issue, or does it sound like I need a 3rd fuel pump this week? Btw I can hear the pump kick on when I turn the key, but I'm thinking the relay may have a bad connection?

 

[destroyer1362]

Bump

 

[mixtapesyndicate]

I've had relay problems too, how does the connector in the relay center look (where the fuel pump relay plugs in)? I had to adjust mine. The bad relay melted some on the plastic on the housing.

 

[destroyer1362]

I'll have to check when I have some light.. did you end up having to replace it?

 

[mixtapesyndicate]

yea but sadly only after replacing the fuel pump.

 

[ravingmadman]

What's the status on this?

 

[destroyer1362]

I really have no idea now.. It looks like the relay was replaced, but it still cranks for about 7 seconds on a cold start. Do you know if I could swap it out w/ the a/c relay just to see if the fuel pump one is bad?

 

[ravingmadman]

That's an excellent question. I have no idea. You might consider putting a guage on your fuel line, and see if you're maintaining pressurewhile cranking. I believe our rigs maintain fuel pressure even when they're off, too, but don't take my word.

This might also not be fuel related at all. When was the last time you did the plugs and wires? It wouldn't hurt to pull a couple out, and look at them...

 

[destroyer1362]

Cap, rotor, wires, and plugs (ACDelco) were all done less than 1k miles ago. Is it possible the second fuel pump he installed was a dud? When I turn the key on in the morning I can hear the pump, but it sounds like it's having a hard time running. After it starts up and then I kill it it sounds like the pump is running faster. If that makes sense. I'll try to make a vid of it..

 

[mixtapesyndicate]

I really have no idea now.. It looks like the relay was replaced, but it still cranks for about 7 seconds on a cold start. Do you know if I could swap it out w/ the a/c relay just to see if the fuel pump one is bad?

I'm not 100% sure but i think they are 2 different relays. I think (from memory) that the a/c relay is a 4 pin relay and the fuel pump relay is 5 or 6.

 

[destroyer1362]

Nothing on this truck has been a simple fix.. Its been some off the wall thing every time. I don't think it likes me.

 

[mixtapesyndicate]

Hahaha, I know how you feel. I've got a really really small coolant leak somewhere, I've been hesitant to chase it down because I'm pretty sure i'm going to end up tearing out the dash to get to the heater core. BOOOOOO

 

[josetizapan]

Nothing on this truck has been a simple fix.. Its been some off the wall thing every time. I don't think it likes me.

What all have you fix in you truck?

 

[destroyer1362]

This fuel problem is the biggest one so far but when I got it the 4x4 didn't work. I thought it was the actuator, then I thought it was the t-case, then I thought it was the 4x4 computer. It eventually got to the point where I thought the front diff had no spider gears. So I opened it up and heres what I found:

It looked like it was never opened before so I can only figure it was done at the factory. There's no way the spring can come off unless the axel tube is off.
Also when I bought it they replaced the a/c compressor, but theres a leak I have to find somewhere. The master cylinder is new too and I think the fluid is slowly seeping out from under the reservoir. I'm probably forgetting something..

 

[josetizapan]

How long have had your denali for?

I've had it for 3 1/2 years and i've change the body control module, t-case motor, put in a used engine later to find out i didnt need it and just couple of months ago i had the tranny rebuilt.

Oh and mine also needs a a/c compressor.

 

[destroyer1362]

had mine a little over a year

 

[atxballer]

As I mentioned earlier I got my fuel pump replaced recently. It turned out to be a dud and was replaced again. My misfire is gone now and my ses light is off. But my truck is still running funny. When I start it after it has been sitting for a while (over night) it cranks for about 7 seconds before it fires up. Also if I shut it off and immediately try to restart it it will crank for about 5 seconds before it will fire up. But if I kill it wait about 15 seconds and try to start it I will start up right away.

Before the fuel pump was replaced it would start right up after sitting over night. So does this sound like a relay issue, or does it sound like I need a 3rd fuel pump this week? Btw I can hear the pump kick on when I turn the key, but I'm thinking the relay may have a bad connection?

Hi! I have a '98 Tahoe that exhibited the same problems as yours. Had my fuel pump replaced (by the dealer), new Delco wires, plugs, distibutor cap, rotor, alternator and starter. If my truck has been running for a bit and then I turn it off and restart it, it takes a few seconds before it starts up.

In the past I figured it would be the fuel pump but now I have no clue. Could it be the fuel pump relay? What was the issues you ended up having even after the new fuel pump. Any help is greatly appreciated! Thanks!

 

[SunlitComet]

alright, 3 yr bump on this baby.

you should make sure you have the new connector type on your pump and also check the pump ground on the frame rail to the left of the pump. and look at your relay for pitting or burning of the terminals.

 

[atxballer]

alright, 3 yr bump on this baby.

you should make sure you have the new connector type on your pump and also check the pump ground on the frame rail to the left of the pump. and look at your relay for pitting or burning of the terminals.

Lol, 3 years old but the problems remain. Just put 190k my on my '98 Tahoe, still going strong. Well sort of... haha. Thanks for the tips, I'll try that!

---------- Post added at 07:19 PM ---------- Previous post was at 05:50 PM ----------

Does that wiring harness/module come with GM part # 19177227 (Fuel pump module) or is that just the standalone fuel pump? I was looking at my statement of work for the lifetime repair on my fuel pump from the Dealer and never saw any mention of the harness or connector.

Checked the Fuel Pump Relay and it looks good and appears to be functioning normally.

 

[SunlitComet]

the newly designed pump has an inline connector and therefore includes a new pigtail to splice in to vehicle wiring. this is the new pump that would fit your '98 2dr vehicle. look at pics for reference of what you should see. www.amazon.com/Delphi-FG0088-Fuel-Pump-Module/dp/B000CGM1FY/