740 wagon fuel pump?

CJ · Post by CJ » 27 Sep 2003, 17:16

I have a 90' 740 wagon with just over 200,000 miles. I had the fuel pump replaced last August and and about 3 weeks ago the car died, no "check engine" light, just died. Brought it to my mechanic, he tested relays, and cleaned battery wires and then came to the conclusion that it was the fuel pump once again. One week after the fuel pump replacement, the car did the same thing. Tested the fuel pump, it too wasn't working, replaced it. Now for the third time about one week after the last fuel pump replacement it has done it again. It starts up, drives normally and then the engine cuts out, no warning, and does not restart. All electric works but it sounds as if it's not getting fuel. It can't be that I'm so unlucky as to have 3 bad fuel pumps. Any ideas? My mechanic is scratching his head

arete · Post by **arete** » 28 Sep 2003, 09:20

I don't have a 740 but-
Do you have an internal & external pump?
Does the pump make a loud noise before going out?
Which pump did he replace?

Guest · Post by **Guest** » 28 Sep 2003, 11:41

I believe he replaced the external pump, twice now, and I have no idea about an internal pump. When the engine cuts off there is no indication that it is about to happen, no noise or engine light warnings. He removes the pump, tests it, says "the pump dosn't work" and then puts in a new one. So I am about to have pump number 3 put in (I assume).

arete · Post by **arete** » 29 Sep 2003, 06:45

I assume you are going to a Volvo mechanic. Here is a site for Volvo parts. It shows an internal & external pump. The noise I was referring to is while the car is running. If your internal is not pumping, then it puts a stronger load on the external causing it to whine/vibrate. If the internal is defective, it will quickly lead to an external failure.
http://catalog.maximumautoparts.com/?year=1990&make=VO

Volvord · Post by **Volvord** » 29 Sep 2003, 14:46

There is a low pressure fuel pump that feeds the high pressure pump. The low pressure pump is located in the fuel tank and feed a high volume of fuel at about 10 psi to the high pressure pump which is located under the car just behind the front doors. If the low pressure or primary pump fails it will not usually cause teh engine to die, but it will cause major hesitation and low power.

It seems very unusual for that number of pumps to fail, I have see maybe one bad one but no more. I would be checking fuel filters, the fuel inlet filter or "sock", fuel pump relay. It would be easy to test the fuel pump off the car with jumper wires.

Guest · Post by **Guest** » 30 Sep 2003, 05:08

No whining or vibration sounds. Everything is normal and then it cuts out. The mechanic (a volvo dealer) says he has checked the relay and it's fine. He has never mentioned anything about the low pressure pump. The car is still in the shop and so I will ask him about that. Also, he showed me the fuel pump and it was not under the car by the front door.

none · Post by **none** » 03 Nov 2003, 08:40

I have a 740 gle. I had thet problem as well. Does everything else stay on , radio, wipers, lights etc? If so it may be the alternator. I had to replace mine when that started happening.

guest · Post by **guest** » 23 Nov 2003, 14:25

I had this same problem. Like everyone else has suggested check the internal pump. The problem I had was there was a hole on the rubber hose leading from the internal pump. The car ran fine until I got around 1/2 tank of gas then it would just die.

waynec · Post by **waynec** » 24 Nov 2003, 07:29

i have exactly the same problem, have changed the fuel filter. After checking some other sites where they have changed both fuel pumps, the fitlers lines etc , some suggest a fuel pump relay and some a MAF sensor. plan on trying both of these suggestions

Guest · Post by **Guest** » 01 Aug 2004, 17:36

Had fuel pump problem on Dodge Mini Van. Every few months fuel pump went out. Had to drop gas tank to get to pump. Real pain. Changed alongside Interstate one time.

Through time, ground wire connection deteriates, causing pump not to run at required volts and amps, thus causing it to burn out.

The ground was internal back into wiring harness somewhere. What I did was run an additional ground wire to frame near pump. Never had any more probems.