answersLogoWhite

0


Best Answer

A relay should not get much hotter than the air around it. I clean carpet with my 1998 Chevy Express van and I noticed the same issue of the relay getting extra hot. This was because my van is stationary and the carpet cleaning machine runs from a drive axle going to the van's engine. Not only is there a rather air tight cover over the fuse compartment under the hood, but the engines heat circulating around this area doesn't help much.
Even with the issue of engine heat and a somewhat air tight fuse compartment, there shouldn't be excessive heating of the relay. Here are two reasons for the excess heat. First, if the fuel pump is demanding more current flow from the battery it can cause the relay to get hot. More resistance in the pump due to a poor connection, or possibly there is a physical resistance associated with the pump- a worn or seized bearing, a clogged filter etc. These are reasons a relay could get hot. Secondly, any poor connection- the wiring harness under the vehicle which is going to the pump has a connector that is notorious for heating and cooling/expanding and contracting, which will drive a person nuts. It took me weeks to figure out that this was the reason my van died randomly. I had gone so far as to remove the fuel pump and put a jumper between pins 87 and 30. At least if you do this you will be able to hear the fuel pump running, or not, without the noise of the vehicles engine drowning it out. It was at this point that I realized that this poor connection at the wiring harness was causing the increased resistance at the relay, and hence it getting hotter.
While we're on the subject of fuel pump relays, note too that it is the vehicles main computer that turns on this relay. If you've ever accidentally shorted out the computer's + to this relay to ground, you're fuse to the ecm ( electronic control module [computer]) might or might not blow. Either way there is a good chance that the computer will stop sending this 'switching' voltage to the relay. The computer is in charge of this relay primarily for safety reasons. In case of an accident the relay removes power to the fuel pump. A good thing this is surely, but buying a whole new computer in the event of this circuit failing can be cost prohibitive to many of us poor drivers. BTW, used computers at a pick and pull junk yard are pennies on the dollar compared to the dealership. I paid a whopping $27 for my 1998 Chevy express computer. The junk yard will give you a list of compatible models that have the same computer in them. I got mine out of a 2500 truck. No tools needed to do the job, but always unhook the battery before removal of a computer. These Chevy's have a tendency to die at stop lights after a computer swap, until it 'relearns' the idle setting. This is normal.
If you are short on cash, or in a jam and need to get your vehicle home, either bypass the relay with a jumper, or in the case of the computer not activating the relay to the fuel pump, you can simply run a 12+ wire to terminal 30 ( or whichever wire is + to the pump). If you take a wire from another 12volt+ circuit which is switched with the key AND remains ON during RUN ( like the 12+ coil[ be careful not to short out the ignition module]) then when you turn off the key the pump will also turn off.
For safety reasons always use a test light to find the proper wire, find a good accurate wiring diagram, and replace the computer as soon as possible.

User Avatar

Wiki User

โˆ™ 2009-11-10 21:24:09
This answer is:
๐Ÿ™
0
๐Ÿคจ
0
๐Ÿ˜ฎ
0
User Avatar

Add your answer:

Earn +20 pts
Q: 2000 express turns off only in warm weather new fuel pump changed fuel relay it does get hot is this normal for fuel relay?
Write your answer...
Submit
Related questions

Where is the fuel pump relay on Mitsubishi express express sj?

remove glovebox.


Where is the brake relay on the Chevy Express van?

Where is the left rear brake and turn signal relay located on a 2010 Chevy express van. V-6


Where is the fuel relay module located on a 1999 Chevy Express van?

need to fix my express van .


How many people swim in a relay team?

It depends what relay you mean - a normal relay has four swimmers (e.g. an IM relay or a freestyle relay) bu relays such as a cannon relay can have more


Acura integra Wont start in cold or hot weather?

The fuel pump relay assembly is notorious for not working when the weather gets hot. This is especially true when it is hot and sunny, which increases the temperature inside the car. This affects the relay as it is found in the dash. The relay is sometimes referred to as the "main" relay.


Where is the starter relay on a 1994 Chevy Silverado?

The starter relay on a 1994 Chevy Silverado is mounted on the starter. The starter and relay are usually changed as a single unit.


I changed every bulb on my 93 deville and the turn signals are still working slowly or not at all is there a relay going bad I changed the fuse also and no help?

There is a relay under the steering wheel


Does the torch relay for the Olympics take place what ever the weather?

yes


What would keep the Fuel pump relay from working the pump fuel?

Bad relay, No power to relay, Wiring from relay to pump and our most likely problem is, the fuel pump is bad. changed it already


How was the pony express set up and how did it work?

The relay made the delivery of the mail faster.


Where is the turn signal flasher located on a 2004 Chevrolet express van?

The 2004 Chevrolet Express signal flasher relay switch can be found beneath the drivers side dashboard. The signal flasher relay switch will be near the brake pedal.


Where is the turn signal flasher on a 2004 Chevrolet express van?

The turn signal flasher relay switch in your 2004 Chevrolet Express will be located beneath the drivers side dashboard. The signal flasher relay switch will be a few inches above the brake pedal.


Where is Mercedes vito hazard relay?

The hazard relay of a Mercedes Vito is incorporated in the normal front wiper switch. Simply pull back the switch and the hazard relay will be seen.


Where is the turn signal relay on 97 Chevy Express van?

to the right of the steering column under the dash


How could people communicate in the past?

TalkingPony ExpressMessage relay runnersLettersetc.


What factors affect relay race?

Speed and agility affect relay races. Other factors that can affect a race include the environment, weather conditions, and training.


Why is my Honda crx is not getting fuel?

main relay switch may need to be changed.


Why did the new telegraph lines put the Pony Express out of business?

because they were having a 2,000-mile relay race


What does a fuel pump relay switch look like?

The fuel pump relay switch looks like the normal electric switch. The function of fuel pump relay switch is turn the fuel pump on.


Where is the fuel pump relay located on a 1993 Volvo 850?

under the hood of the car unscrew the fuse box and your relays are underneath there, i changed my fuel pump relay last year pretty quickly its relay 103


What are the jobs of actual storm chasers?

To relay information to the National Weather Service to aide them in making decisions to issue warnings to alert the public of bad weather.


Changed fuel pump on 1985 corvette but will not start?

check your fuse box and relay box.


How would you know when a fuel pump relay has to be changed?

probably when the pump stops working! WOW


What does a normally closed relay do when it is energized?

The term normaly closed means that in its normal state the relay or contact is closed. So when energized it will open and break the circuit.


2006 suzuki katana headlights wont come on changed bulbs changed fuses bike runs but no lights.how do i fix?

Your Headlight relay may be dead.