Gasoline pump

Hello!
I have a big problem!!!!
my v8 went out on the highway and before that, as far as starting the v8's was concerned, was every time a problem.
Now we have found that the gasoline pump has torn the ass up.
Unfortunately I have not all too much technical understanding....
one can tell me which gasoline pump I need for the 4.2 bj 05.1992. I was told that there are a whole lot of manufacturers for this part. which manufacturer, however, is the best. And above all, what do I have to plan for the gasoline pump in terms of money?
or does anyone happen to have a used to lie around that he can send me against bare????

I hope you can help me quickly. because the biggest problem is that I depend on the car every day and I had to take an extra holiday now because I don't get to work.
and as always, you can't spend all too much money.
hoffe ihr könnt mir vielleicht was günstieges anbieten.

Greetings...rené