I have a vector 3000 watt inveter red fault light is on, wont power a 6.5 amp fuel pump

dear see that :
1- the range of voltage which inverter work between it for example 180-260 v
2- most small generator voltage reach more than 260V so the inveter not work
3-check the frequency of genaratoer if it not fix the inverter will mot work

Hello, I hear you. Was the reason to supply 240 volts? When you try the inverters separately, do you get 120Volts output? Let us look at the units working individually first and go from there.

In March, 2006, Black & Decker purchased Vector Products, Inc. Since the acquisition, Black & Decker has assumed the manufacturing of all Vector products. For customer service and warranty information for Vector products, please contact Black & Decker Customer Service. Or, you can order a replacement battery from: www.batterymart.com/p-6v-4_5ah-sealed-lead-acid-battery.html

Inverter run on batteries sir, and if these batteries are not charged, the run time {the number of hours it will work} reduces.
S0, you will need to connect the inverter to a power source.Theses will allow your batteries to be charged and enable it to run for a long period of time.
Make sure your batteries are still OK.i.e working properly

There is a fuse on these things at the back of the case. Could be in a slide out plastic holder, or in a round holder with a knurled screw or bayonet type cap. If this fuse is not blown, then the news is not good.

the problem is that you must have your subs wired to a lower impedance than the amp can handle. Wire your subs to 4 ohms, or get an amp that can handle 2 or even 1 ohms and crank it and enjoy!!!!!!!!!!!

Try disconnecting the DC input for 5 min. or so, this will generally reset the unit.

I’m happy to assist further over the phone at https://www.6ya.com/expert/robert_aad3edb7dfa380b9

your inverter needs to cool at all times , if the fan does not work,try buying a small standing fan to blow cool air to you machine, it is possible that your heater is making the inverter to over heat please avoid using the heater on the inverter

Inverters use high power transistors to create an A/C voltage from a D/C input. These transistors are the common point of failure when the units are not cooled properly or used beyond their rated capacity. (Actually, you should always buy an inverter that’s rating for continuous use is well below what your actual need is). What’s most likely happened is that these have shorted out and need to be replaced. Unfortunately, replacement parts alone will likely cost nearly what a new unit costs.

Sorry to be the bearer of bad news; but you basically have a nice paperweight with some pretty lights and fans on it.