My van is showing a P0340 and saying it is the camshaft position sensor code

Ok is there a test to do on how to test the fuel pump? When we run a diagon it doesnt show that as being whats wrong

Ok so the van started right up no problem but the check engine light is on. I did not try anything you suggested the last time I did not drive it for im afraid it will do what it did prior
also thank you for all the things so far you have suggested any other ideas as to what it could be

Sorry to bother you again the codes my van are showing are p0731 and p0340 it now does turn on but I have not drove the van it starts and stays running so far but im at a loss for these codes

I have a 99 villager and the camshaft position sensor can indeed cause all kinds of strange issues including sporadic start and no start. It has haunted me off an on and the past weeks I would get a "false start"--then release the key then it would start right up and run fine. For that reason I would go with the issue for MONTHS-getting more and more nervous that I had a short or something may be going bad. I went and got a new starter and almost installed it but then went to get a couple extra relays (inhibitor) but it made no difference. However the final few days the engine would crank like hell perfectly find but not start till I released the key then hit it again--and it would start. The false start was "as if the battery was weak" another description "it seems like there must be a ground issue or short because at times it acts like it "barely has the power to kick over and start"--battery is new heavy duty. I saw the code "camshaft position sensor" but the distributor was just replaced about 6 months back so I didnt believe it. (The stranding by the way was to have a distributor brought to me and it started right up and I drove off)--I also was having strange issues leading up to it--which I know now--not then match the cam sensor "getting ready to fail--until full no start" Also I could not believe a sensor would make the starter act so weak sporadically it was as if one piston came up on compression and simply stopped the cranking dead--how could that be a sensor? So I go down and get a new distributor free on warranty--put it in and EVERYTHING WAS PERFECT. I cannot get the "sporadic hesitant to start but always starts"--issue to return. (It was doing it every time in the last days)---conclusion THAT CAMSHAFT SENSOR CAN CAUSE STRANGE THINGS TO HAPPEN WHICH CANNOT BE FIGURED OUT. --SPORADIC AND NO PATTERN. Simply putting in the new distributor instantly made the van crank like CRAZY and fire right up in much less than a half second. I forgot to add that I was close to being stranded again at any second--but the van ran perfect and gets better mileage then it should. I had no other detectable issues with the motor running under all conditions--I go straight up hills in 110 degree heat as if no hill is there. Others may experience driving issues but NO starting issues. If the camshaft sensor is suspect replace it instantly

Just a followup that its been a few days now driving around in the heat almost 120 and the sporadic strange start--is not reappearing at all. I also started out a couple years back with "fuel pressure suspicions" and such. A huge red flag is when analyzing is you start hearing stuff like "fuel pressure and maybe water in the gas"--stuff like that is a warning that your "branching out into nomans land". Naturally it could be those things but unlikely. I replaced my filter twice and pumped gas down into a container and water was indeed in globules down in the bottom. Turns out it did not affect anything in the remotest. I did put alot of dry gas in there anyway but I believe I can find water globules in almost any car--that does not affect anything. Another thing on the water--my whole life I always thought it was a joke to put in gas dry since gas now is 10% alcohol anyway. Dont ask me why--but the water was there--that alcohol that now comes in gas did not have any effect on it. Possibly the alcohol in the gas is chemically bound to the gas so that it does remove water in and of itself? (Not saying the water globules should have been there and were a good sign--just saying that it did not affect anything)--at that time I replaced the o2 sensor--the vehicle started right up and ran great--water or not. On the codes and after 5 years of agony with this van I would say ive learned this--if the code is there replace the cheap items which almost all of them are--keep resetting the codes and disconnect and reconnect the battery--drive it and keep watching the codes. So far THE CODE THAT NEVER VARIES--IS A PRIME SUSPECT.