Most any parts store should be able to get them for you. May have to order them, but, they can usually get 'em next day. (and you don't have to pay shipping either.... )

 

Well just re checked, 1995 gas engines at idle should be 35-45 psi, fuel pressure above 45 psi is fine, as I said, every good functional fuel pump has always showed me 47 psi at idle, I adjusted mine to 50 psi and it brought down my idle adaptive memory close to 0,

was just the fuel pump replaced or the whole fuel pump modual, including sending unit? Regulator is actualy separate from pump

and yes, heyyou is totally right about bosh, they don’t work right on magnum engines.


viperdave

 

I replaced the whole pump assembly and the rollover valve. If you have time and want to hear it I'll tell u the whole story with this truck.

 

A year ago ran fine one day it died. No spark. Sat started ran die no spark. Replace cam sen. No fix. Crank sen. Got spark fuel pump wouldn't run. Replace it ran for a second. Lost spark and fuel. Could thump ecm and it would run. Replaced ecm with salvage one run like a new one for about a month. Then started this missing under load problem. Sent original ecm off had rebuilt. Run like new for couple week then miss under load code 43. New coil packs and wires. Same prob. Ohm volt check all connections everything where need too be. And still same problem a year later.

 

Well crap, your vehicle would be the one I would get at the dealership, I was a tech for 20 years 87-08, I would always get the the cars/trucks after other techs threw parts at it and didn’t fix it

first thing first, Humer me and hook up a mechanical fuel pressure gauge, run it out the back of the hood, don’t close it all the way, just first click and take it out for a drive

watch it through the windshield and see what the pressure drop is under full to almost full throttle. 40 to me seems low and the fact you have a v10 truck means it sucks down the fuel under full throttle. It shouldn’t drop at all but maybe 3-4 psi, if it drops below 38 you need to figure out why

my 79 trans van has factory fuel injection but I couldn’t use an in tank pump, it had to be external. I used an aeromotive pump and regulator and had to run a return line back to the filler neck worked great for awhile till I had the engine cutting out on take off from a stop, Take off slow and no problem. I mounted an auto meter fuel pressure gauge and watched it and my fuel pressure dropped to 33-37 psi and it started cutting out.

I found a kinked line feeding the pump so wasn’t getting enough fuel

both yours and my engine doesn’t use a return line to the tank from the factory, early magnums did have a return line and the regulator was on the fuel rail with a vacuume line hooked to it, under hard throttle, the loss of vacuum at the regulator made it spike to make sure you got good fuel to the injectors

without the return line ,,the regulator is in the tank and it has to work perfect to supply enough fuel to the engine cuz there is no vacuum line controlling it

also just for ****s and giggles, with the fuel gauge hooked up, run it for a minute or so and shut it off completely and watch the gauge

the pressure should hold for a few close to 40 psi. If it don’t and drops immediately you have a problem. The check valve near the pump should hold it close to 40psi for at least 30 seconds to a minute. Also, if it doesn’t hold that would explain the long crank times to start the motor


if everything is good with the fuel system after checking, we can move on to something else

oh, how many miles on it?

 

Viperdave. Sorry it took so long to get back. The truck has 112000 on it. I just did fuel pressure check. On this gauge its showing 45psi. When I mash it it might drop to 43. I shut it off and 20 min later still showing 45psi.

 

First reply didn’t go through

ok fuel pump and system sounds good. Thanks for doing that for me

remind me year ,model, engine size?

also 112,000 on an ECM is not bad

 

95 3500 dually v10 auto.

 

Ok so you have an air pump with true dual exahst and dual cats.

 

Do you have a thred already started for your problem?

cuz I think we hijacked another guys thred